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.
2002 Chevrolet Impala LSFACTORY OEM SERVICE PROCEDURE
Anti-Theft DTCS
ANTI-THEFT DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description |
|---|---|
| DTC B2947 | PASSLOCK™ SENSOR POWER CIRCUIT LOW |
| DTC B2948 | PASSLOCK™ SENSOR POWER CIRCUIT HIGH |
| DTC B2957 | PASSLOCK™ SENSOR DATA CIRCUIT LOW |
| DTC B2958 | PASSLOCK™ SENSOR DATA CIRCUIT HIGH |
| DTC B2960 | PASSLOCK™ SENSOR DATA INCORRECT BUT VALID |
| DTC B3031 | CONTROLLER IN LEARN MODE |
| DTC B3033 | SYSTEM INDICATES TAMPER |
| DTC P1626 | NO OR INCORRECT FUEL ENABLE SIGNAL, WITH ENGINE RUNNING |
| DTC P1629 | NO OR INCORRECT FUEL ENABLE SIGNAL, WITH ENGINE CRANKING |
| DTC P1630 | PCM REMAINS IN PASSWORD LEARN MODE FOR MORE THAN 2 SECONDS |
| DTC P1631 | PCM DETECTS INCORRECT PASSWORD, ANTI-THEFT SYSTEM FAILURE OR ATTEMPTED VEHICLE THEFT |
Factory Service Tools
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.