Powertrain Control Module (PCM) Internal Fault
The PCM detects an internal fault.
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 has found something wrong inside itself, which can prevent proper engine control and lead to major performance issues.
What the computer is actually seeing
The PCM monitors its own internal operation and registers a fault when it detects an anomaly in its processing or communication functions.
What a healthy reading looks like
N/A; this code indicates an internal error, so no specific sensor values are expected.
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 battery voltage; it should be between 12.0V and 14.5V. If low, charge or replace the battery.
- 2Inspect all wiring and connectors to the PCM for corrosion, frays, or loose connections. Fix as necessary.
- 3Check for any PCM software updates or recalibrations available from the manufacturer; this can resolve glitches.
- 4Clear the fault code and perform a test drive to see if the code returns. If it does, consider replacing the PCM.
Common causes
- Faulty PCM
- Corrupted software/firmware in the PCM
- Electrical issues affecting PCM functions
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
No, it's high severity; it can affect performance and may cause a no-start condition.
Will the code come back after resetting?
Yes, if the underlying issue is not resolved, expect it to return.
Why does this code trigger with other SPN codes?
Internal faults can affect multiple functions, causing related codes to appear.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →