What's a TEHCM?
TEHCM stands for transmission electro-hydraulic control modules. TEHCMs are a unit that combines the functions of the transmission control module, valve body solenoids, and pressure and temperature switches into one unit.
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. With the increase in usage of this product and vehicles entering into the end of the TEHCM lifespan, there is a growing demand for replacement TEHCM units.
Common TEHCM Failures:
The original equipment manufacturer (OEM) version of this product typically fails with 80,000 to 120,000 miles. Failure is usually caused by:
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Debris contaminates unit
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Switch deterioration
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Solenoids deterioration
The symptoms of TEHCM failure are:
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Harsh or delayed shifting
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Inability to shift gears
The way to fix a failed a TECHM is to replace the original with a high-quality remanufactured aftermarket alternative.
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Remanufacturing is a complex process to take an existing part and rebuild it so it performs like new. In partnership with Dorman Products, Transtar offers thoroughly re-manufactured TEHCMs replacements for more than 26 million vehicles on the road.
Here’s the standard process for remanufacturing a Dorman TEHCM sold through Transtar:
BREAKDOWN
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Completely disassemble and thoroughly clean with a proprietary scrubbing and flushing process
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Test electrical functionality of communication, transmission fluid temperature sensor, gear range switch (PRNDL), and I/O sensors
REBUILD
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Replace pressure switches with PEEK filter material
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Add brand new components where applicable, including pushrods, filter plates, solenoid retainers, O-rings, fluid conduits, and connector seals
TEST
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Run automated, full-functionality, wet vehicle simulation test
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Examine with new automated PASS/FAIL solenoid activation with stricter tolerances for improved performance and increased reliability
How Do You Replace a TEHCM?
Ordering the right replacement TEHCM and installing it effectively is easier than you think. Here’s How:
Verify
Ordering the right part is simple. You need to verify make, model, year, RPO codes, and Broadcast codes at DormanProducts.com. When possible, also verify OE number.
Program
Programming TEHCMs with the latest OE software is straightforward with the Transtar
Remote Assist Program (RAP) Kit. It allows you to flash modules right in your shop, and you can save 20% on programming any Dorman product simply by providing the serial number. All Dorman re-manufactured modules are guaranteed to program successfully, or any fees will be refunded.
Troubleshoot
A lot of technicians waste time returning perfectly good TEHCMs because of other issues they couldn’t diagnose. Here are some common issues that make it seem like a functioning TEHCM isn’t working.
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Unresolved DTCs
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Low transmission fluid
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Unsecured 14-pin connector
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Disconnected switches
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Bent terminals
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Unstable battery voltage
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Improper terminal grounding
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Incompatible aftermarket accessories
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Pinched I/O speed sensor wires
Fortunately, all Dorman TEHCMs come with detailed instructions, and if you ever have issues, you can call the Dorman Tech Line to speak with an ASE Blue Seal Certified Technician at 866-933-2911.
Application Coverage
|
Transtar Part Number |
Transmission Application |
Year Coverage |
|
A144420B |
6T40, 6T45 |
2008 - 2010 |
|
A124420B |
6T70 |
2007 - 2009 |
|
A124420C |
6T40, 6T45 |
2010 - 2011 |
|
A124420D |
6T70, 6T75 |
2010 - 2013 |
|
A104420A |
6L45, 6L50, 6L80, 6L90 |
2010 - 2011 |
|
A104420B |
6L50, 6L80, 6L90 |
2007 - 2013 |
|
A104420C |
6L45, 6L90 |
2011 - 2013 |
|
A104420D |
6L50, 6L80 |
2006 - 2007 |