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 P1602: Pcm Not Programmed: Testing
With DRBIII(R), attempt to program PCM. See POWERTRAIN CONTROL MODULE under PROGRAMMING. Start the engine and allow the engine to reach normal operating temperature. With the DRBIII(R), read DTCs. Does the DTC reset? If yes, replace PCM. Program the new PCM. See POWERTRAIN CONTROL MODULE under PROGRAMMING. If no, test is complete.
Use the Manual With the Right Hardware
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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.
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