Powertrain Control Module (PCM) - Over Temperature
The PCM is indicating it's running too hot.
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 Powertrain Control Module monitors its own temperature. If it gets too hot, it can lead to performance issues or failure. This can happen if the PCM is covered with debris or isn't getting enough airflow.
What the computer is actually seeing
The PCM reports a temperature reading above its normal operating range due to internal heat issues, causing it to enter a protective mode to prevent damage.
What a healthy reading looks like
Typical PCM operating temperature is between 70°C and 120°C. If the temperature exceeds 120°C, this code may trigger.
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. Check PCM physical condition for signs of damage or excessive dirt build-up. Decision: If damaged, replace the PCM; if clean, proceed to step 2.
- 22. Inspect wiring and connectors to the PCM for corrosion or loose connections. Decision: Repair any found issues; if all connections are good, proceed to step 3.
- 33. Measure PCM temperature using a scan tool. Ensure it's within 70°C to 120°C range. Decision: If above 120°C, proceed to next step; if normal, further diagnosis needed for other issues.
- 44. Verify that all cooling systems (fans, radiators) are operating correctly to provide necessary airflow. Decision: Repair cooling issues if found; if cooling checks out, consider PCM replacement.
Common causes
- Poor ventilation around the PCM
- PCM is externally damaged
- Electrical fault in the PCM's power or ground circuits
- Failed or malfunctioning sensors that lead to excessive heat generation
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I drive the vehicle with this code?
It's not recommended to drive the vehicle because overheating can lead to PCM failure and loss of control.
Will this code come back?
It may return if the underlying issue isn't addressed, such as poor cooling or a damaged PCM.
Why does it pair with codes like SPN 1553?
These codes often represent interrelated issues, like electrical faults that affect both the PCM and other systems.
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