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
Diagnostic Aids
- The BCM detects that the ignition is ON and sends the appropriate power mode message to the other modules. The BCM must be connected to the class 2 serial data circuit for many other modules to communicate with the scan tool.
- If the class 2 serial data circuit was shorted to ground, U1300 or U1305 will be set as history DTCs. Refer to DTC U1300, U1301 Or U1305 (Generic Short DTC) .
- If the class 2 serial data circuit was shorted to B+ U1301 or U1305 will be set as history DTCs. Refer to DTC U1300, U1301 Or U1305 (Generic Short DTC) .
Factory Service Tools
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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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