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.
2009 Chevrolet Tahoe Base, 4.8 CFACTORY OEM SERVICE PROCEDURE
Circuit/System Verification
- Ignition ON, verify the park assist system is enabled through the DIC.
- If the park assist system is manually disabled, enable the system. Refer to the vehicle owners manual for instructions on enabling the system.
- Observe the scan tool Park Assist Switch parameter while pressing and releasing the park assist disable switch. The parameter should change between Active and Inactive.
- If the parameter does not cycle between the specified values, refer to Park Assist Disable Switch Circuit Malfunction below.
- Observe the scan tool Park Assist Switch LED parameter while pressing and releasing the park assist disable switch. The parameter should change between On and Off.
- If the parameter does not cycle between the specified values, refer to Park Assist Disable LED Circuit Malfunction below.
- Command each of the park assist indicator LEDs ON and OFF with a scan tool. Each of the LEDs should turn ON and OFF as commanded.
- If any of the LEDs do not turn ON and OFF, refer to Parking Assist Indicator Malfunction .
- Ignition ON, vehicle in reverse, verify the scan tool Park Assist System Status parameter is Enable.
- If not the specified value, refer to Diagnostic Aids under this test procedure and the scan tool Park Assist Disable History parameters to determine the cause of the inhibit.
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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