P2125

Throttle/Pedal Position Sensor/Switch E Circuit

Q: Is it safe to drive with P2125?

Drivable at low speed, but the car may enter reduced-power mode and respond poorly to the throttle, so fix it before you need full power.

Q: Can I just clear P2125?

It will come back until the circuit fault is repaired — the ECM continuously monitors this sensor's circuit.

Throttle / pedal position Generic OBD-II Medium

What it means

P2125 indicates a circuit fault in the 'E' throttle/accelerator-pedal position sensor — the signal is out of the expected range or intermittent. Since the ECM uses this sensor to read throttle demand, the fault typically triggers reduced-power or limp mode until the sensor or its wiring is repaired.

Medium

Can I keep driving? Often limited — the car may drop into limp/reduced-power mode; drivable at low speed but have it fixed before relying on full throttle response.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Reduced engine power, often limp mode
Hesitation or erratic throttle response
Occasionally a hard start

Common causes

Most likely first

Faulty accelerator pedal / throttle position sensor 'E'Likely
Open or shorted sensor harness wiringCommon
Poor or corroded electrical connection at the sensorCommon
Faulty ECM/PCMLess often

How to diagnose & fix

Work through it in order

Read freeze-frame and check for companion pedal/throttle codes (P2120, P2126, P2135).
Inspect the sensor connector and harness for bent pins, corrosion, chafing, or a loose fit.
With key on, engine off, verify a steady 5-volt reference and a good ground at the connector.
Back-probe the signal wire and watch the voltage sweep smoothly as the pedal is moved.
If reference, ground, and signal wiring are good, replace the pedal/throttle position sensor and retest.

FAQ

Quick answers

Is it safe to drive with P2125?+

Drivable at low speed, but the car may enter reduced-power mode and respond poorly to the throttle, so fix it before you need full power.

Can I just clear P2125?+

It will come back until the circuit fault is repaired — the ECM continuously monitors this sensor's circuit.

Read & clear P2125 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX