Transmission Control Module Fault
Fault related to the transmission control module communication.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The Transmission Control Module (TCM) is having trouble talking to other parts of the vehicle, which can affect shifting and performance.
What the computer is actually seeing
The TCM is not receiving the expected signals from the engine control unit (ECU) or other modules indicating a communication error or response delay.
What a healthy reading looks like
Expected communication signals between TCM and ECU should be active with low resistance, typically under 5 ohms across contacts.
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 related to the TCM for damage or corrosion. Repair as necessary.
- 22. Check the vehicle's ground connections for the TCM. Clean and secure them if needed.
- 33. Measure the resistance across TCM connections, looking for values under 5 ohms. If higher, check for open circuits or shorts.
- 44. Scan vehicle for additional codes that might provide more context about TCM issues. Address any related codes found.
- 55. If all wiring and connectors are good, consider testing or replacing the Transmission Control Module.
Common causes
- Faulty Transmission Control Module
- Open or shorted wiring
- Corroded connectors
- Bad ground connections
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderately severe, so you should repair it soon as it can affect shifting and performance.
Will this code come back after clearing?
If the underlying issue isn't fixed, it will likely return after some driving.
What else can trigger this code?
Issues with other modules, blown fuses, or major electrical faults can lead to this code.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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