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: General Description
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 an 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.
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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.