P2125 code meaning
Throttle/Pedal Position Sensor/Switch E Circuit
Powertrain system Generic code P21xx codes Check engine light
What P2125 means
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.
P2125 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2125
- Engine warning lamp and reduced power message
- Delayed or limited pedal response
- Traction control may be switched off
Common causes of P2125
- Most 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
- Less likelyECM input fault
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Accelerator pedal position sensorPedal sensor wiringECM
What each part of P2125 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 1 | Area: fuel and air metering. |
| 25 | The exact fault in that area. |
What to do next
- Note P2125 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2125
What does P2125 mean?
P2125 means "Throttle/Pedal Position Sensor/Switch E Circuit". P2125 reports a general electrical fault in signal circuit E. It is a generic code, so it means the same on every make.
Is it safe to drive with P2125?
Drive gently and only to a workshop. With P2125 the car can go into limp mode (reduced power) to protect itself.
Will P2125 fail an emissions test?
Yes, it can. P2125 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2125 to fix?
Difficulty: easy. A typical repair takes 0.3 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2125 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.