Invalid Data Received From TCM
The communication from the Transmission Control Module (TCM) to the engine control module (ECM) is faulty.
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What it means (plain English)
The engine control module is not getting the right signals from the transmission control module, meaning they can't communicate properly about shifting and other functions.
What the computer is actually seeing
The ECM is expecting specific data formats and information from the TCM, such as gear position or speed data, but it's receiving values that are outside the normal expected range or data structure.
What a healthy reading looks like
Normal values from TCM to ECM include gear position codes (0-6 typically) or speed sensor voltage levels around 0-5 volts, depending on the state of the vehicle.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Inspect wiring and connectors between TCM and ECM for corrosion or damage. Repair or replace as necessary. Decision: Are the connections intact?
- 22. Check transmission fluid level and condition. Add or change fluid if low or burnt. Decision: Is fluid level correct and in good condition?
- 33. Use a scan tool to read TCM data; ensure that it’s operational. Look for gear position readings. Decision: Is TCM reporting valid data?
- 44. If the TCM shows faulty readings, consider reprogramming or replacing the TCM if applicable. Decision: Has the fault cleared after reprogramming/replacement?
Common causes
- Faulty Transmission Control Module (TCM)
- Wiring issues or damaged connectors between TCM and ECM
- Software/firmware mismatch between TCM and ECM
- Low transmission fluid or poor fluid quality affecting TCM operation
Typical repair cost
$$ - $$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It may be drivable, but shifting can be erratic, which could lead to further damage or safety issues.
Will this code come back after I fix it?
If the underlying issue is resolved, the code should not reappear.
Why does this code pair with others?
This code indicates a communication issue, often affecting other systems, which can trigger related codes.
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