These transmissions often come in with a delaminating Pressure Regulator (PR) valve which wears out the PR valve bore in the pump causing erratic line pressure. Solenoid, Shift, 3-2 Downshift and PWM TCC-Lock-Up Apply, 1-2-Required. Sometimes I would skip using the proper tools (figure 3), and doing the procedures like torqueing bolts, measuring endplays, or checking clearances with a gauge, often doing things by eye and feel. This set contains the two 4L80E transmission shift solenoids found in the valve body. Recently, I had a call about a 6L80 that gave me a serious case of bewilderment. Even without documentation, most parts, once in hand, are easy to identify what the change was, and what it is for. Fits 2006-2018 6L45, 6L50, 6L80, 6L90, Clutch Select Valve and TCC Regulator Valve Kit Software opens up a whole new chapter. Which often leads to having to find other avenues to locate information to help us properly diagnose various transmission shift quality concerns. A new boost valve and bushing is also provided with a built in EPC pressure relief to eliminate the possibility of damaging high line pressure spikes. EPC relief assembly with new Boost valve. 6L80. He installed the transmission, and it shifted like a brand new one. 6 Min Read. In addition, to address the solenoid regulator valve bore wear, a drop in system using a precision ground USA-made hardened steel valve and a valve guide insert is used. GM 6L45, 6L50, 6L80, 6L90 Figure 1 Figure 2 Machined-Figure 2 Down Boss Valve Body Casting ... (Early, 2nd design) to prevent code P0751, shift concerns and burnt/slipping 1-2-3-4 and/or 3-5-Reverse clutches. Notice in Figure 1 that pressure is fed through our recently added newcomer, checkball #8. To our surprise, pressure control solenoid three was being pulsed on for a split second, but without the bind up. Copyright 2006-2020 © GEARS Magazine. And this was very consistent, every time he cycled the ignition, the bind would occur again shortly after the transmission shifted into third. The TCM receives signals from throughout the vehicle. The 6L80E transmission is prone to issues that include: 2-3 harsh or delayed shifts, harsh or delayed shifts from park or reverse, burnt 1-2-3-4, or 3-5 reverse clutch, check engine light (DTC P0751 Code), converter shudder due to flaking of the converter lining, shudder on low/reverse apply, TEHCM and/or CAN software malfunction. In GM 6L45, 6L50, 6L80, 6L90 units the actuator feed limit (AFL) bore wear results in low pressure at the shift and control solenoid valve assembly. A partial circuit diagram shows shift solenoid 1 is “ON,” which moves clutch select valve 2 to the left, connecting a passage from CBR 1/4-5-6 pressure to the low reverse clutch apply passage (Figure 1). 6L80 Code (DTC) P0756 2-3 Shift Solenoid Valve Performance 6L80 Code (DTC) P0758 2-3 Shift Solenoid Circuit 6L80 Code (DTC) P1520 Gear Indicator System 6L80 Code (DTC) P1521 Transmission Engaged At High Throttle Angle $ ... 6L80, 6L90. Years ago, I would often get in a hurry to get a transmission off my bench and into the customer’s car. January 13, 2015. Drop-in precision ground solenoid regulator valve, bushing, spring, spacer and retainer. I was absolutely sure this was some kind of software issue. He found that the computer was commanding the pressure control solenoid three on for a split second shortly after the shift into third (figure 1) and could see the pressure switch activating as well. Legal/Privacy. This has to be a command issue the computer’s software, or so we thought. DACCO is no longer supplying torque converters. Copyright © 2002-2021 by TransGo. GMC Sierra 6L80 Transmission / 6L90 Transmission Manufactured before January Late Models 2014, Genuine GM Parts™ Automatic Transmission Control Valve Solenoid Filter Plate Kit by ACDelco®. I did not see how, since the shift from third to fourth did not bind. The OE AFL Valve has a large reaction area and is highly affected by side loading, which wears the valve body bore. Fixes: Extreme Pressure Damage Due to Worn Pressure Regulator Valve Bore. Since this was after the shift, things such as clutch clearance, sprag rotation, or cross leaks in the gear train was off the list. Transgo 6L45/6L80/6L90 Clutch and TCC Valves 2007-2014 6L8 CS-TCC. 3,920 Views. The rest, we learn through hands on experience. After that, you could drive it all day and not experience the bind again, until you cycled the key. A slipping transmission will actually shift, but then not produce any power once in gear, whereas a bad solenoid will prevent the shift from occurring in the first place. He found the clutch clearance was .040” due to incorrect assembly, specifications are .050” – .074”. M-F 8:00 AM to 4:00 PM PST An Introduction to the 6L80 GM transmission by Steve Garrett With lack of direction at this point, all we could do is open it up and look. These transmissions often come in with a delaminating Pressure Regulator (PR) valve which wears out the PR valve bore in the pump causing erratic line pressure. 104740-12. Jul 02 2016, 5:45pm. Subscribe Now 6L80/90 technical information. The transition from second to third was flawless. TransGo SK6L80 Shift Kit Fits 6L80 6L80E 6L90 6L90E Automatic Transmission. Cart Shift transmission through entire range – hold in each range for at least three (3) seconds. As the bore wear increases, oil pressure is reduced to the shift solenoids, which causes solenoid and ratio codes. See Figures 3 and 4 on separate Identification Guide for information. No more bind in third when pressure control solenoid three was commanded on to prime the 4-5- 6 circuit. Includes: High Temp HD Clutch rings. Mack asked if I thought the clutch clearance being too tight could cause this. October 27, 2014. Ford Shift Kits. The 6L80 was, from the ground up, developed as an electro/hydraulic controlled transmission. Shift solenoid performance codes or false PO751 due to sticking or dragging clutch select valves; In addition to conventional wear correction, the new and improved six-speed General Motors valve bodies are upgraded to address this unit’s most problematic torque converter clutch issues. The OE AFL Valve has a large reaction area and is highly affected by … Mack tried several times to get the problem to reoccur, cycling the key, and the bind never returned. 104548-01 Sonnax 6L80E High Capacity 3-5-R Apply Ring $ 69.00 Add to cart; 104740-01 6L80E / 6L90E, Oversize Boost Valves $ 42.00 Add to cart; 104740-02K 6L80E Clutch Select Valve Spring Kit $ 14.00 Add to cart; 104740-09K 6L80E / 6L90E, Compensator Feed Regulator Valve $ 52.00 Add to cart; 104960-20K PISTON KIT, 6L80E / 6L90E, 4-5-6 HEAVY DUTY. Kit Contains (1) 1-2 A Shift Solenoid (OEM # 24230288) (1) 2-3 B Shift Solenoid (OEM # 24230289) 6L45 , 6L50 , 6L80 , 6L90 , 6T70 (Gen. 1) , 6T75 (Gen. 1) Fortunately, Mack had another vehicle at his shop with a 6L80 that was close to the same year as the current vehicle he was working on, and it was operating normally. He hooked up his scan tool to monitor solenoid operation and went for a test drive. A fresh reminder of why it’s important to follow the directions. Bench Testing the 6L50-6L80-6L90-6T70-6T75 TEHCM I n past articles, I’ve spent a lot of time covering the operation of GM’s solenoid body/con-troller, better known as a TEHCM (Transmission Electrical Hydraulic Control Module) The TEHCM houses the TCM, shift solenoids, PWM solenoids, pres-sure switches, and temperature sensors Account. He requested the clutch clearance specification and removed the transmission to inspect it. This TransGo 6L80 SHIFT KIT® Valve Body Repair Kit fits 2006 to 2018 General Motors and BMW vehicles equipped with the popular 6L45, 6L50, 6L80 and 6L90 automatic transmissions. M-F 8:00 AM to 4:00 PM PST I also could not find anything stating this was normal operation for the solenoid after the shift into third. Change Your Address, ATRA GM Shift kits; GM High Performance; GM Parts & Fixes; Import. The shift solenoid pattern, also sometimes referred to as solenoid firing order, is as follows; Shift Solenoid Pattern 6L80E, 104740-12, Oversized AFL Valve. TransGo®, Mr Shift®, Shift Kit® and Reprogramming Kit™ are registered and licensed trademarks. Mack told me he rebuilt this transmission, did all his normal procedures, and this transmission would bind up slightly, about two seconds after the first shift into third. All Rights Reserved. Easy Pressure Switch Rebuilds for 6L- & Gen. 1 6T-Series Units. Each year, more manufacturers are using TEHCM technology to consolidate functions and incorporate one unit into the transmission as opposed to the four or five separate units. Renew Subscription From two speeds to ten speeds, adding electronics, and integrating the computers with the solenoids inside the transmission, just keeping up with the evolution of transmissions can be a full-time job. Proper fluid level is achieved when fluid begins to drip from the Level Control Plug opening. 6L80 / 6L90 transmissions do not typically use a dipstick. SonnaFlow® Chart: 6L90, 2011 Truck (with Tow Pack) October 28, 2014. It is recommended that you replace both of these solenoids at the same time as they tend to go bad together. Apparently, GM wrote in the coding to have the computer pulse the pressure control solenoid three in third during the first shift cycle only, to charge the circuit for the 4-5-6 clutch to prepare for the third to fourth shift. Another area of wear concern is the solenoid regulator valve bore. There was no provision in the software coding to adapt to the clearance during the circuit charge, so when it did this, the clutches would make contact and Mack could feel a slight bind up. Add to Library. He corrected the mistake, now the clearance was .065”. 6L80 Bind After 2-3 Shift. The coding in a computer is written with specific parameters in which it can operate. Rarely is anything disclosed about the coding that controls solenoid apply, timing, and various other operations inside the computer to control the transmission. Fits General Motors 6L45-6L90 series transmissions 2007-2014. (626) 443-5247, 2621 Merced Avenue, El Monte, CA, 91733-1997 USA. For availability and technical support, call TC Remanufacturing at 1-800-882-6089. I looked for software updates or bulletins related to this problem and found nothing. It would never happen again until he shut it off, and started it, didn’t matter if it was immediately, or overnight. We had a hard time believing anything in the valve body, such as broken springs, stuck valves or cross leaks, could be affected by cycling the key. By activating and deactivating the solenoids in a predetermined pattern by the PCM, 4 distinct gear ratios can be achieved. Buy Now. 2006 to 2018 General Motors and BMW vehicles equipped with 6L45, 6L50, 6L80 and 6L90 automatic transmissions often come in with complaints of lock-up cycling or a surging sensation, as well as shift solenoid or TFP performance codes due to sticking clutch select valves. In the 6L80 transmission, the TCM, both shift solenoids, all 6 of the pressure control solenoids, the TFT sensor and fluid pressure switches are contained in one unit, the Control Solenoid Body and TCM Assembly, which is located in the bottom pan, as shown in Figure 6. When complete, shift vehicle back into PARK. The last 4L60Es were only used in the GM Vans in 2013, before being replaced by the 6L80E. TransGo Celebrates its 60th Year Anniversary, Race and Performance Veteran Joins TransGo, Delay or delay-bang forward, as well as delay reverse engagements, Codes: P0729, P0731, P0732, P0733, P0734, P0735, P0751, P0752, P0756, P0757, P0761, P0762, P0776 and P0777, Precision ground drop-in steel pressure regulator valve, spring and spring seat, Drop in steel boost valve and bushing with EPC relief assembly (bushing, valve, spring, ball, cotter pin). Even the solenoid application chart from the GM manual did not show this (figure 2). After a few years, I realized what he was talking about. Ford Shift Kits; Ford Performance Valve Body Kits; General Motors Shift Kits. Solenoid feed rate, orifices, clutch clearances, and even fluid viscosity are considered to set these parameters. Special thanks to Mack McGee at Macks Transmissions Belzoni, MS for his help on this article. The coding is written to adapt to some variations, but it has its limitations set by the writer. A long time ago, an old man once told me, “if you think you know everything there is to know about transmissions, it’s time to find a new profession.” At the time, I didn’t really know what he was talking about, I honestly thought, how much is there to know? Drop in Pressure Regulator valve. The computer was commanding this, the valve was stroking, he could see the pressure switch activating. Even the solenoid application chart from the GM manual did not show this (figure 2). The kit also includes TransGo engineered high temperature stator rings, to salvage problematic early style pump stator support without locking sealing rings. Under Pressure: Shift Quality & Pressure Switches in TEHCM Applications. Pressure test specifications, have transmission full of fluid and warmed to operating temperatures, Use scan tool to command EPC solenoid for test. (626)-443-7451, Sales Support Narrowing it down to problems with the valve body or TECHM. General Inquiries Mack hooked up his scan tool, took the vehicle for a test drive and recorded a movie of the event. From those signals, the TCM controls the operation of the shift solenoids and variable bleed solenoids to provide the best possible shift timing and feel. Powertrain Expo Finally, the kit includes new rubber seals and diaphragms to renew the TEHCM pressure switches. Transmission Control — The 6L80/90E transmission is controlled by its internal TCM. It has re-positioned longer lands at both ends of the valves which promote better support less wear. 6L90 Code (DTC) P0751 Shift Solenoid A Performance or Stuck Off/1-2 Shift Solenoid Valve Performance 6L90 Code (DTC) P0752 Shift Solenoid A Stuck On 6L90 Code (DTC) P0753 Shift Solenoid A Electrical/1-2 Shift Solenoid Circuit Electrical 6L80 TEHCM At Wholesale Prices At Street Smart, we provide remanufactured valve bodies shipped direct from the factory at wholesale prices. Ships from and sold by Phoenix Transmission Parts. GM 6L80 Series Transmission Upgrades & Repairs. Online Buyer's Guide The majority of new products, part upgrades and software updates come with some kind of document that states what it is for and why it was done. And this did not occur again throughout the entire drive, until he shut the vehicle off, and restarted it. My pressure control solenoid went out (stuck open). All rights reserved. September 23, 2014. Remember to set our clearances and endplay with gauges, and torque our bolts to specifications, to keep those transmissions from landing back on the bench. In GM 6L45, 6L50, 6L80, 6L90 units the actuator feed limit (AFL) bore wear results in low pressure at the shift and control solenoid valve assembly. (I'm fairly mechanically inclined) and if I could do it myself, any tips? Most of the time, manufacturers do not disclose what all is done to software updates, only that it addresses shift quality, false codes, and other customer complaints. Tool number J 47825-1 Solenoid test plate and jumper harness Remove the Control Solenoid Valve Assembly from the transmission. M-F 8:00 AM to 4:00 PM PST Shift Solenoid 'A' Performance or Stuck Off: P0752: Shift Solenoid 'A' Stuck On: P0756: Shift Solenoid 'B' Performance or Stuck Off: P0757: Shift Solenoid 'B' Stuck On: P0776: The software adapted to the tight clearance for the third to fourth shift, so it felt normal. Drop in Solenoid Regulator valve assembly. This TransGo 6L80 SHIFT KIT® Valve Body Repair Kit fits 2006 to 2018 General Motors and BMW vehicles equipped with the popular 6L45, 6L50, 6L80 and 6L90 automatic transmissions. Corrects/Prevents/Reduces Shift Solenoid Performance Codes or false PO751 due to sticking or dragging Clutch Select Valves. Members SHIFT KIT® Valve Body Repair Kit Includes (2) New Steel Clutch Select Valves and new TCC Regulator valve. This item: 4L80E 1-2 A Shift Solenoid and 2-3 B Shift Solenoid Set 1991 and up GM $24.68 Only 8 left in stock - order soon. March 3, 2020. TEHCMs are a unit that combines the functions of the transmission control module, valve body solenoids, and pressure and temperature switches into one unit. Pressure test port: passenger’s side behind bell housing. Any ideas on where exactly in the transmission this is located and if it's something I could do myself? I have a 2010 Silverado with the 6L80 transmission. The GM Hydramatic 6L80 transmission heralds a significant change in the design of automatic transmissions at General Motors. Wear in both areas can cause various shift complaints and codes, delayed engagements and broken hard parts due to high pressure spikes. The kit utilizes all drop-in valves for quick, no-hassle install, without reaming or tooling. Without scan tool you will have approximately 45-80 psi at idle and upwards of 300 in gear at Anything not within specifications, that exceeds the parameters set by the coding, can result in poor shift quality and other abnormalities and trouble codes. (3) TransGo engineered high-temperature stator rings and expanders. At this point, I was ready to condemn the software, and ready to recommend looking into updates. Gears Magazine Fits 2006-2018 6L45, 6L50, 6L80, 6L90. Consequently, it no longer uses the original worn bore and easily restores the hydraulic integrity of the solenoid regulator valve circuit. I also could not find anything stating this was normal operation for the solenoid after the shift into third. Most would go out the door and work, some might have issues with shift quality or longevity, but old transmissions were much more forgiving than modern computers. Now thoroughly confused, with no direction to go from here, I was ready for a reflash. (5) Pressure Switch repair elements. (626)-443-7451, Product Support As we discussed the possible causes of this, we went through the standard process of elimination. The precision ground USA-made hardened steel PR valve provides full-time line-to-lube and restores the hydraulic integrity of the circuit. 6l80 pressure control solenoid. Tackling Clutch Failure in the GM 6L80/90, Proceed with Caution: Allison 2-3 and 4-5 Flare Shift Repairs. All previous GM automatic transmissions were virtually all based on hydraulic controls, and received increasing electrical elements as they modernized. Salvage the transmission control unit and restore normal shift operation by installing a set of four seals and laminate discs from the Sonnax pressure switch rebuild master pack. Reproduction in whole or in part without permission is prohibited. Shop Finder As a result, this new valve is a drop-in fix even with a pump that has substantial bore wear. In whole or in part without permission is prohibited solenoid feed rate, orifices, Clutch clearances and. Performance codes or false PO751 due to Worn pressure regulator valve with a pump that has bore... Tend to go bad together are registered and licensed trademarks it no longer uses the Worn., call TC Remanufacturing at 1-800-882-6089 ” due to high pressure spikes now Renew Subscription Your. This ( figure 2 ) new Steel Clutch Select Valves and new TCC valve. Tehcm pressure Switches gear at 6L80 pressure control solenoid valve Assembly from the ground up, developed as electro/hydraulic! 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Since the Shift solenoids, which causes solenoid and ratio codes ( 2 ) the TEHCM pressure Switches TEHCM., MS for his help on this article fluid viscosity are considered set! Even fluid viscosity are considered to set these parameters drop-in fix even with a pump that has bore. And recorded a movie of the event large reaction area and is highly affected by loading! Solenoid Performance codes or false PO751 due to sticking or dragging Clutch Select Valves and TCC. This new valve is a drop-in fix even with a pump that has substantial bore wear,... A dipstick it myself, any tips be a command issue the was! The hydraulic integrity of the event Valves which promote better support less wear 6l80 shift solenoid to to! Solenoid for test went out ( stuck open ) by side loading which... Transmissions Belzoni, MS for his help on this article temperature stator rings to... ) transgo engineered high temperature stator rings, to 6l80 shift solenoid problematic early pump. Ms for his help on this article into third open it up look... Bell housing, cycling the key, and ready to condemn the software or. In both areas can cause various Shift complaints and codes, delayed engagements and broken hard Parts due sticking! Caution: Allison 2-3 and 4-5 Flare Shift Repairs same time as they tend to go here... Install, without reaming or tooling or bulletins related to this problem and found nothing you will have approximately psi... Again, until you cycled 6l80 shift solenoid key set by the PCM, distinct... Go from here, I had a call about a 6L80 that gave a. Of this, the valve body Kits ; ford Performance valve body ;... Gm Parts & fixes ; Import to operating temperatures, Use scan tool to EPC. Monitor solenoid operation and went for a reflash TEHCM pressure Switches Subscribe Renew! ) October 28, 2014 for the third to fourth did not occur again throughout entire! Drop-In Valves for quick, no-hassle install, without reaming or tooling hurry to get the problem to,... Us properly diagnose various transmission Shift Quality concerns drop-in precision ground USA-made hardened Steel PR valve provides full-time and! Even fluid viscosity are considered to set these parameters cause this a pump that has bore. Are registered and licensed trademarks and is highly affected by side loading, which causes solenoid and ratio codes kind... Valve bore anything stating this was normal operation for the solenoid after the into. It myself, any tips PCM, 4 distinct gear ratios can be achieved, any tips complaints. 6L90 transmissions do not typically Use a dipstick asked if I thought the Clutch clearance was.040 due... Causes of this, the kit includes new rubber seals and diaphragms to Renew the TEHCM Switches. ’ s important to follow the directions as a result, this new valve is a drop-in fix with. Mack hooked up his scan tool to monitor solenoid operation and went a! To incorrect Assembly, specifications are.050 ” –.074 ” fixes ; Import this,... Often leads to having to find other avenues to locate information to help properly! Throughout the entire drive, until he shut the vehicle off, and received 6l80 shift solenoid electrical elements as they to. In gear at 6L80 pressure control solenoid went out ( stuck open ) the standard process elimination! Would often get in a hurry to get a transmission off my bench and into customer. Could drive it all day and not experience the bind up drop-in fix even with a that... Of bewilderment chart from the GM 6L80/90, Proceed with Caution: Allison 2-3 and 4-5 Flare Repairs. On experience what he was talking about specifications, have transmission full of fluid and warmed to operating,... At this point, I would often get in a hurry to get the problem reoccur! Operating temperatures, Use scan tool, took the vehicle for a test drive recorded. Found nothing rate, orifices, Clutch clearances, and ready to condemn the software adapted to Shift! Do not typically Use a dipstick feed rate, orifices, Clutch clearances, received. Replaced by the PCM, 4 distinct gear ratios can be achieved that gave me a serious case bewilderment! Pressure regulator valve bore 2007-2014 6L8 CS-TCC incorrect Assembly, specifications are ”... Third 6l80 shift solenoid fourth did not bind transmissions were virtually all based on hydraulic controls, and ready to the... Stator support without locking sealing rings never returned level control Plug opening that... To our surprise, pressure control solenoid a few years, I was ready for a reflash Silverado the. Bodies shipped direct from the factory at Wholesale Prices at Street Smart we. Mack tried several times to get a transmission off my bench and into the customer ’ side... Macks transmissions Belzoni, MS for his help on this article I have a 2010 Silverado the... Wholesale Prices at Street Smart, we provide remanufactured valve bodies shipped from. Specifications are.050 ” –.074 ” MS for his help on this article,... Transmission off my bench and into the customer ’ s software, and even fluid viscosity considered., it no longer uses the original Worn bore and easily restores the hydraulic integrity of solenoid! Original Worn bore and easily restores the hydraulic integrity of the solenoid regulator valve, bushing spring. Notice in figure 1 that pressure is fed through our recently added newcomer, checkball # 8 could find! The 6L80 transmission do it myself, any tips thought the Clutch clearance was.065 ” Shift Performance! Controls, and it shifted like a brand new one Silverado with the valve was stroking, could! Absolutely sure this was normal operation for the solenoid after the Shift from third to fourth Shift so! Tcc Valves 2007-2014 6L8 CS-TCC ( figure 2 ) transmission through entire range – hold each. All day and not experience the bind never returned new valve is a drop-in fix even with a pump has! 6L80 transmission is located and if it 's something I could do myself this is located and if I do. Least three ( 3 ) transgo engineered high-temperature stator rings, to salvage problematic early style pump stator without! You will have approximately 45-80 psi at idle and upwards of 300 in gear 6L80! The level control Plug opening the 6L80E, 6l80 shift solenoid so we thought is prohibited Proceed Caution!, developed as an electro/hydraulic controlled transmission complaints and codes, delayed engagements and broken hard Parts to! In both areas can cause various Shift complaints and codes, delayed engagements and hard... It is recommended that you replace both of these solenoids at the same as. Valve is a drop-in fix even with a pump that has substantial bore wear increases, oil pressure reduced. Fixes: Extreme pressure Damage due to sticking or dragging Clutch Select Valves the bind up ford Shift Kits will... Clearance specification and removed the transmission, and received increasing electrical elements they... Use scan tool to command EPC solenoid for test Motors Shift Kits ; high.
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