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 P1630: POWERTRAIN CONTROL MODULE UNABLE TO LEARN PASSLOCK(tm) MODULE PASSWORD: Description
This diagnostic test checks for enable password learning flag indicating Powertrain Control Module (PCM) is in learn password mode. This mode allows the PCM to learn password from Passlock(tm) module at assembly or when being serviced. Password needs to be learned whenever PCM or Passlock(tm) module is replaced. DTC P1630 will set when the enable learning flag is set. Malfunction Indicator Light (MIL) will not illuminate. A history DTC clears after 40 consecutive warm-up cycles, if this or any other emission related diagnostic does not report any failures. Scan tool CLEAR INFO function can be used.
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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.