P2168
Throttle/Pedal Position Sensor F Maximum Stop Performance
Throttle control (drive-by-wire)
Generic OBD-II
Medium
What it means
P2168 means the 'F' throttle/pedal position sensor isn't reporting the maximum (full-travel) stop the ECM expects. The ECM uses this endpoint to calibrate how far the pedal or throttle can move, so a wrong reading throws off throttle control and can trigger reduced-power mode. It's usually a failing position sensor, a wiring or connection fault, or a reference/ground problem.
Medium
Can I keep driving? Often drivable, but throttle response may be limited or the car put into reduced-power mode; have it diagnosed soon.
Common symptoms
What you'll notice
- Check-engine light on
- Reduced power or 'limp' (failsafe) mode
- Poor or inconsistent throttle response
- Rough or unstable idle
Common causes
Most likely first
- Faulty throttle/pedal position sensor (F element) reading an incorrect maximum stopLikely
- Sensor circuit wiring open, shorted, or chafedCommon
- Poor connection or corrosion at the sensor connectorCommon
- 5-volt reference or ground fault affecting the signalLess often
- Failing ECM/PCMLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and note any companion pedal/throttle codes (P2139, P2140).
- Inspect the sensor connector and wiring for damage, corrosion, or a poor pin.
- With the key on, verify a steady 5-volt reference and clean ground at the connector.
- Watch the F signal sweep through full pedal/throttle travel; a flat spot or wrong maximum points to the sensor.
- Replace the throttle/pedal position sensor if it fails testing; suspect the ECM only after wiring is confirmed good.
FAQ
Quick answers
Is it safe to drive with P2168?+
Usually for short distances, but reduced-power mode can appear without warning, so avoid situations where you need brisk acceleration until it's repaired.
Can I just clear P2168?+
It will clear, but a sensor or wiring fault will set it again, often within a drive cycle or two.
Related codes
Often seen with P2168
Read & clear P2168 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