Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC P0602: Powertrain Control Module (PCM) Programming Error (V6)
General DescriptionÂ
The powertrain control module (PCM) is equipped with an update program to update its control program. The programs in the CPU of the PCM are classified as a PCM program (update-capable program) and a program for the update function (non-updatable program). The program update only updates the PCM program. When the PCM power is turned off during an update, the power for the update function is lost, and the update process stops. When the program update is stopped before it is completed, the PCM stores a DTC that indicates the update is not finished.
Monitor Execution, Sequence, Duration, DTC Type, OBD StatusÂ
| Execution | Continuous |
| Sequence | None |
| Duration | 1 second or less |
| DTC Type | One drive cycle, MIL on |
| OBD Status | PASSED/FAILED/NOT COMPLETED (STILL TESTING) |
Enable ConditionsÂ
| Condition | Â |
|---|---|
| Vehicle | ON mode |
Malfunction ThresholdÂ
The PCM program update stops 1 second before it is finished.
Possible CauseÂ
NOTE:Â The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
- PCM program unwritten
Diagnosis DetailsÂ
Conditions for setting the DTCÂ
When the PCM program is not written in the PCM, the MIL comes on and a Pending DTC and a Confirmed DTC are stored in the PCM memory.
Conditions for clearing the DTCÂ
The MIL, the Pending DTC, and the Confirmed DTC are cleared when the PCM program update is completed.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.