Transmission Control Module (TCM) Data Invalid
The Transmission Control Module detected invalid input data.
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 getting bad or unexpected information from sensors or other systems. This can mess with how the transmission shifts or operates overall.
What the computer is actually seeing
The TCM registers values from connected sensors, like speed or pressure. When it gets readings outside of expected ranges, it sets this code and may alter transmission behavior to protect the vehicle.
What a healthy reading looks like
Speed sensor readings should be within 0-3000 RPM and pressure inputs should reflect 100-300 PSI under normal operation in a diesel transmission.
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.
- 1Check transmission fluid level; should be within safe range according to specs. If low, fill it and retest.
- 2Inspect wiring and connectors to speed sensors; look for frays, corrosion, or loose connections. Repair as necessary.
- 3Use a scan tool to check actual speed sensor readings compared to vehicle speed. Should match closely when driving at varying speeds. If not, replace sensor accordingly.
- 4Check for any additional fault codes related to the transmission system; resolve any present issues.
Common causes
- Faulty speed sensor
- Wiring issues or bad connectors
- Low transmission fluid level
- Faulty TCM
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity, so it’s best not to drive until resolved to avoid transmission damage.
Will this code come back after clearing?
It may come back if the underlying issue isn't fixed; keep an eye on it post-repair.
Why does it pair with other codes like SPN 5300?
These codes often relate to similar issues in the transmission system, usually indicating multiple faults or sensor failures.
Working a real vehicle right now?
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