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.
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HOMESERVICE MANUALSCHEVROLET2001CAVALIER LS, 2.4 TREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 8 (ENGINE CONTROL SYSTEM SELF-DIAGNOSTICS - 5.7L)DIAGNOSTIC TESTSDTC P0804: SKIP SHIFT LIGHT CONTROL CIRCUIT ("Y" BODY)DIAGNOSTIC PROCEDURES
2001 Chevrolet Cavalier LS, 2.4 T
Diagnostic Procedures
2001 Chevrolet Cavalier LS, 2.4 TSECTION Diagnostic Procedures
WARNING: This page is about a different car, the 2000 Pontiac Firebird, 2000 Chevrolet Corvette, and 2000 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
- Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . After performing OBD system check, go to next step.
- Turn ignition on, with engine off. Using scan tool, command 1-4 upshift light on and off. If light turns on and off as commanded, see DIAGNOSTIC AIDS . If light does not turn on or off when commanded, go to next step.
- Turn ignition off. Disconnect PCM harness connector containing shift light control circuit. Turn ignition on. If shift light is off, go to next step. If shift light is on, go to step 5.
- Connect a fused jumper wire between ground and shift light control circuit at PCM connector (harness side). If shift light is on, go to step 6. If shift light is not on, go to step 7.
- Repair short to ground in shift light control circuit. After repairs, go to step 9.
- Check connections at PCM. Repair as necessary. After repairs, go to step 9. If connections are okay, go to step 8.
- Check for faulty shift light bulb, open ignition feed circuit to bulb, or shift light control circuit open or shorted to battery voltage. Repair as necessary. After repairs, go to step 9.
- Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
- Using scan tool, select DTC, CLEAR INFO function. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step 2.
- Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test.
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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.