OBD CodesWhat it means
Cars with electronic throttle have no cable. Sensors on the pedal tell the computer what your foot is asking for. Two signals are compared all the time. If they disagree, the computer cannot be sure what you want and cuts power to stay safe.
Codes in this group
| Code | Meaning |
|---|---|
| P2120 | Pedal position sensor D circuit fault |
| P2121 | Pedal position sensor D reading out of range |
| P2122 | Pedal position sensor D signal too low |
| P2123 | Pedal position sensor D signal too high |
| P2125 | Pedal position sensor E circuit fault |
| P2126 | Pedal position sensor E reading out of range |
| P2127 | Pedal position sensor E signal too low |
| P2128 | Pedal position sensor E signal too high |
| P2135 | The two throttle position sensors disagree |
| P2138 | The two accelerator pedal sensors disagree |
Bank 1 is the side of the engine that has cylinder 1. Sensor 1 is before the catalytic converter and sensor 2 is after it. More terms explained.
What you may notice
- Sudden loss of power, engine stuck near idle
- Warning light for engine power or throttle
- Accelerator feels dead or delayed
Common causes
Most likely first:
- A failing pedal sensor
- A failing throttle body
- Water or corrosion in a connector
- Chafed wiring between pedal, computer and throttle
What to check first
- If power drops in traffic, switch on hazard lights and move off the road safely
- Switching the engine off and on may restore power for a while, but the fault will return
- Have it checked soon: this is a safety system
Have a mechanic confirm. A fault code tells you which system reported a problem, not which part has failed. The same code can have several causes, and they differ between car models. Use this page to understand the code, then have a qualified mechanic test the car before any part is replaced.
After the repair
Once the cause is fixed, the code can be cleared with a scan tool, or the warning light goes out by itself after several trips without the fault. Clearing a code without fixing the cause only hides it for a while. More about clearing codes.
Related codes
Mass air flow (MAF) sensor (P0100), Manifold pressure (MAP) and barometric sensor (P0105), Intake air temperature sensor (P0110), Engine coolant temperature sensor (P0115), Thermostat and engine warm-up (P0125), Throttle position sensor (P0120), Electronic throttle actuator (P2100), Oxygen sensor before the catalytic converter (sensor 1) (P0130). All codes.
Written in November 2026. These are generic OBD-II codes, the same on all makes. Causes and repair steps differ between models.