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 MANUALSCADILLAC1991SEVILLE V8-300 4.9LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTRANSMISSION POSITION SENSOR/SWITCHDESCRIPTION AND OPERATION
1991 Cadillac Seville V8-300 4.9L
Transmission Position Sensor/Switch: Description and Operation
1991 Cadillac Seville V8-300 4.9LSECTION Description and Operation
PRNDL-P/N Switch:
The PRNDL switch is part of the transmission Neutral Safety-Back Up (NSBU) Switch, located on the top of the transaxle. The PRNDL switch provides four inputs to the PCM to indicate the transmission gear position. Gear position information is used by the PCM to control shift solenoids and VCC operation. Improper switch operation will cause PCM code E091/E91 to set.
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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.