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 MANUALSPONTIAC1994FIREBIRD TRANS AM GT, 2D COUPEREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - 5.7LECM/PCM CODE CHARTSCODE 91, SKIP SHIFT LIGHTNOTES
1994 Pontiac Firebird Trans Am GT, 2D Coupe
Code 91, Skip Shift Light: Notes
1994 Pontiac Firebird Trans Am GT, 2D CoupeSECTION Notes
When skip shift solenoid is enabled by PCM, transmission can be shifted from 1st to 4th gear only. This maximizes fuel economy.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- Skip shift light should not turn on. If light is on, circuit is shorted to ground or PCM is faulty.
- PCM should turn on skip shift light.
- Checks skip shift light circuit up to the PCM connector. If light illuminates, PCM connector is faulty or PCM does not have the ability to ground circuit.
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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.