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.
Pedal position sensor: Diagnostics
If the sum of the voltages from the two pedal sensors deviates too greatly from 5V, then a fault must have occurred in one of the potentiometers or their circuits. In this case, the pedal position is not reliable.
Diagnostic trouble code P1530 or P1531 will be generated and the throttle control will go into limp-home mode.
If the two pedal sensor voltages were short-circuited to each other, the pedal sensor value would be 2.5V irrespective of the pedal position. This corresponds with the pedal being depressed half way. This fault cannot be detected by the sum voltage check so the control module sends short pulses on the control module input for sensor 2. If these pulses are detected on the control module input for sensor 1, then the sensors have been short-circuited.
Diagnostic trouble code P1532 will be generated and the throttle control will go into limp-home mode.
- In case of a pedal sensor malfunction, the maximum engine speed will be limited to 2200 RPM by fuel shut-off.
- The feel of the pedal is not affected in limp-home mode.
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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.