P0222
Throttle/Pedal Position Sensor/Switch B Circuit Low
Throttle / pedal position
Generic OBD-II
High
What it means
P0222 means the ECM sees an abnormally low voltage on the "B" throttle or accelerator pedal position sensor circuit. Because the engine relies on this signal to know how far the throttle is open, the ECM often drops into a reduced-power limp mode until the reading is trustworthy again. It points to a sensor, wiring, or connector fault rather than a mechanical engine problem.
High
Can I keep driving? Usually driveable but expect reduced power or limp mode — the ECM restricts the throttle to protect the engine when it can't trust the sensor.
Common symptoms
What you'll notice
- Check-engine light on
- Reduced power or limp mode (throttle capped)
- Hesitation, surging, or erratic acceleration
- Rough or unstable idle
Common causes
Most likely first
- Faulty throttle position or accelerator pedal position sensor (B channel)Likely
- Short-to-ground or open in the sensor signal wiringCommon
- Corroded or loose sensor connectorCommon
- Damaged 5V reference or ground circuitLess often
- Faulty ECM (least likely)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and inspect the throttle/pedal sensor B connector for damage or corrosion.
- Backprobe the signal wire while operating the throttle/pedal and watch for a dropout or short to ground.
- Check the sensor's 5V reference and ground against spec.
- Replace the throttle or pedal position sensor if the signal is out of range with good wiring.
- If wiring and sensor test good, suspect the ECM. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0222?+
The car will usually still run, but often in reduced-power limp mode with poor throttle response. Fix it promptly — sudden power loss in traffic is a safety risk.
Can I just clear P0222?+
It returns as soon as the ECM sees the low signal again. The sensor or its wiring has to be repaired first.
Related codes
Often seen with P0222
Read & clear P0222 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX