Throttle/Pedal Position Sensor/Switch B Circuit Low
What does P0222 mean?
The P0222 code means the vehicle's onboard diagnostic system has detected: Throttle/Pedal Position Sensor/Switch B Circuit Low. This is a moderate severity code.
Common Symptoms
- Reduced engine power or limp mode
- Engine idles higher or lower than normal
- Check Engine Light illuminated
- Poor throttle response or no response
- Vehicle may stall when coming to a stop
Probable Causes (Ranked by Likelihood)
- Short to ground in TPS B signal circuit Very High
- Faulty throttle position sensor B High
- Corroded or damaged wiring connector at TPS High
- Open circuit in TPS B reference voltage wire Moderate
- PCM/ECM internal failure Low
Step-by-Step Diagnostic Procedure
-
Check TPS B signal voltage with a multimeter -- reading below 0.2V at closed throttle indicates a low circuit fault
-
Inspect the TPS connector for bent, corroded, or pushed-back pins
-
Test the 5V reference voltage at the TPS connector -- if missing, trace the wire back to the PCM
-
Wiggle-test the TPS wiring harness while monitoring live data for intermittent drops
-
Replace the TPS or throttle body assembly if sensor tests confirm internal failure
Frequently Asked Questions
Can I drive with code P0222?
Driving short distances is possible, but the vehicle will likely be in limp mode with limited power. Have it repaired soon to prevent unsafe driving conditions.
What causes a low TPS B signal?
A low signal is typically caused by a short to ground in the TPS B wiring, a failed sensor, or a broken reference voltage wire. Corrosion at the connector is also a common cause.
Is the TPS part of the throttle body?
On most modern vehicles, yes. The TPS is integrated into the electronic throttle body and cannot be replaced separately, requiring a full throttle body replacement.