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.
Code P033, Extended Travel Brake Switch Input Circuit Problem: Action
1992 Saturn SL1 AutomaticSECTION Action
WARNING: This page is about a different car, the 1995 Cadillac Seville. However, it is still accessible from the selected car via links, so may be relevant.
PCM disables cruise control and substitutes status of TCC contacts of TCC brake switch input for the extended travel input. PCM turns on SERVICE VEHICLE SOON light message.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- PCM input PI86 should cycle from high to low when brake pedal is depressed and then released. If PI86 remains low, check for open or short to ground in system. If PI86 remains high, check for short to voltage in system.
- If 10 volts or greater is measured, check circuit No. 847 or TCC brake switch for open circuit. If less than 10 volts is measured, check circuits No. 341 and 847 for a short to ground.
RENDER: 1.0x
NO RELATED
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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.