P0222
Throttle/Pedal Position Sensor B Circuit Low Input
The computer is getting a throttle or pedal position signal from circuit B that is too low. That can make the vehicle go into reduced power mode because the PCM cannot trust throttle input.
- SEV
- 4/5
- DRIVE
- CAUTION
- DIY
- $20-$250
- SHOP
- $150-$700
Quick answer
AI-CITATION READYWhat it means
Can you drive with it?
Most common causes
- Faulty throttle position sensor B or accelerator pedal sensor B
- Damaged wiring, poor terminal contact, or connector corrosion in circuit B
- Low reference voltage or sensor ground problem
Typical repair cost
DIY usually runs $20-$250. Typical shop repair lands around $150-$700, depending on the root cause.
01 / Definition
P0222 means the PCM detected a low voltage or low signal in throttle or pedal position sensor circuit B. The low signal may come from a failing sensor, poor 5-volt reference, damaged wiring, connector corrosion, or an internal throttle body or pedal assembly fault.
02 / Drive status
With caution. The vehicle may enter limp mode or have weak throttle response. It is usually safer to limit driving until the low-input sensor circuit is tested and the throttle system responds normally.
03 / Symptoms
- Check engine light
- Reduced engine power
- Poor throttle response
- Stalling or unstable idle
- Limp mode
04 / Causes
| 1 | Faulty throttle position sensor B or accelerator pedal sensor B | high |
|---|---|---|
| 2 | Damaged wiring, poor terminal contact, or connector corrosion in circuit B | high |
| 3 | Low reference voltage or sensor ground problem | medium |
| 4 | Throttle body, pedal assembly, or PCM fault | medium |
05 / Diagnostic sequence
- 01Confirm P0222 and review freeze-frame data for throttle opening and pedal input.
- 02Check for related throttle body, pedal sensor, or correlation codes.
- 03Inspect the throttle body and accelerator pedal connectors for corrosion, loose pins, or water intrusion.
- 04Monitor live data from sensor B and compare it with the matching sensor A signal for smooth tracking.
- 05Test the 5-volt reference, ground, and signal circuit before replacing the throttle body or pedal assembly.
06 / Repairs
| 1 | Repair damaged sensor B wiring, poor grounds, or connector terminals | $20-$150 |
|---|---|---|
| 2 | Replace the throttle body or accelerator pedal assembly if the B signal stays low during testing | $100-$500 |
| 3 | Correct PCM reference-voltage or control faults if circuit testing points there | $150-$700 |
07 / Related codes
08 / FAQ
Is P0222 a throttle body problem or a pedal problem?
It can be either. The exact component depends on how the manufacturer defines sensor B on that vehicle, so live data and wiring tests matter.
Can low voltage trigger P0222?
Yes. A weak reference voltage, poor ground, or high resistance in the signal path can make sensor B read too low.
Will P0222 cause reduced power mode?
Very often, yes. The PCM may limit throttle authority when it cannot trust the sensor signal.
Can P0222 also trigger P2101 or P2135?
Yes. If the low B-circuit signal makes the throttle request or throttle-position feedback look wrong, the PCM can also set throttle performance or correlation codes such as P2101 or P2135.
09 / Source and method
- DATA BASIS
- OBD-II REFERENCE + OBD2.HELP
- METHOD
- STATIC VALIDATION
- SAFETY
- INFORMATIONAL
This page combines OBD-II diagnostic reference data with OBD2.help generated diagnostic guidance for code meaning, likely causes, and repair direction.
Publishing uses deterministic schema and build validation, plus manual spot checks on representative pages before release.
Safety-critical diagnosis and repairs should be confirmed with a qualified mechanic, especially when the vehicle is misfiring, overheating, or losing power.