Throttle and pedal position
P2135
Throttle/Pedal Position Sensor/Switch "A"/"B" Voltage Correlation
The sensors that report the throttle or the gas pedal position disagree or read out of range. On drive-by-wire cars the computer may limit power to stay safe.
Fix it soon
Can I keep driving? For a short while, gently. Have it checked in the next few days, and stop if the car feels, sounds or smells different. The car may suddenly lose power or refuse to rev. That's dangerous when pulling into traffic, so have it fixed before relying on the car.
Common causes
- A worn pedal or throttle position sensor
- A dirty or failing electronic throttle body
- Wiring or connector trouble
- Low system voltage
Listed roughly from most to least likely. The same code can have different causes on different cars.
What to do
- If the car drops into limp mode (very little power), pull over safely, switch off, wait a minute and restart.
- Have the throttle body cleaned and the sensors tested.
- Check the battery and charging voltage.
General guidance. Your owner's manual wins. If a red warning light is on or the car drives differently, stop safely and get help.
Related codes
- P0120Throttle/Pedal Position Sensor/Switch "A" Circuit
- P0121Throttle/Pedal Position Sensor/Switch "A" Circuit Range/Performance
- P0122Throttle/Pedal Position Sensor/Switch "A" Circuit Low
- P0123Throttle/Pedal Position Sensor/Switch "A" Circuit High
- P0220Throttle/Pedal Position Sensor/Switch "B" Circuit
- P0221Throttle/Pedal Position Sensor/Switch "B" Circuit Range/Performance
- P0222Throttle/Pedal Position Sensor/Switch "B" Circuit Low
- P0223Throttle/Pedal Position Sensor/Switch "B" Circuit High
Track this automatically in Tagwell Auto
Tagwell Auto keeps your car's service dates and mileage, so when a code shows up you know what was done last. With a Bluetooth reader for the car's diagnostic port (called OBD-II), the phone app can read the code itself.