P2125Throttle/Pedal Position Sensor/Switch E Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2125 reports a general electrical fault in signal circuit E. GM uses it as Accelerator Pedal Position Sensor 2 Circuit: the ECM looks for a continuous or intermittent open or short in the sensor 2 circuit with a counter at 12.5 ms per count (19 of 39 counts). In GM's 2006 tables sensor 2 is valid between about 0.16 and 2.3 V. GM bulletin 14636 lists P2125 among the pedal codes caused by a broken solder joint inside the pedal (2009-2011 Impala, LaCrosse). Range/Performance is P2126, explicit low or high voltage P2127/P2128, dropouts P2129, and the D/E comparison P2138. With one pedal track lost the ECU usually limits engine power.
- What you may notice
- Engine warning lamp and reduced power message
- Delayed or limited pedal response
- Traction control may be switched off
- Likely causes
- LikelyInternal fault in the pedal sensor (e.g. cracked solder joint)
- PossibleOpen or short in the sensor 2 wiring or 5 V reference
- PossibleLoose or corroded pedal or inline connector
- RareECM input fault
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €20 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.