P0602High urgency
Control Module Programming Error
Network · ECM/PCM
⛔ Vehicle may not start or may run erratically. ECU reprogramming is required — must be done at a dealer or shop with factory scan tools.
What this means
The ECU/PCM has detected that its programming is incorrect — either from a failed programming attempt, a calibration mismatch, or a corrupted memory sector.
Likely causes
- Failed ECU programming/flashing attemptMost common
- Incompatible software version installedMost common
- Battery failure during programmingCommon
Estimated repair cost
ECU reprogramming at dealer$100 – $400
ECU replacement and programming$500 – $2,000
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Frequently asked questions about P0602
What does P0602 mean?
The ECU/PCM has detected that its programming is incorrect — either from a failed programming attempt, a calibration mismatch, or a corrupted memory sector.
Is P0602 serious?
Vehicle may not start or may run erratically. ECU reprogramming is required — must be done at a dealer or shop with factory scan tools.
How much does it cost to fix P0602?
Repair costs for P0602 range from $100 – $400 depending on the root cause and your vehicle.
Can I drive with P0602?
No — this code indicates a serious issue. Stop driving and have the vehicle inspected immediately.