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 P027, Open Throttle Position Switch Signal: 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 turns on MIL. EGR is disabled. Garage shift adapts are maintained at current levels.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- LO fan status light should cycle from ON to OFF to ON when accelerator is depressed and released.
- Checks if fault is with throttle position switch.
- Checks PCM's ability to recognize signal if circuit No. 427 is open.
- Checks if circuit No. 451 is open.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.