P0222 on Chevrolet: How to Diagnose & Fix
Throttle/Pedal Position Sensor/Switch B Circuit Low Input
1 Chevrolet model · 1 documented issue · 1 critical · $100-$450 repair
P0222 on Chevrolet by model: symptoms, diagnosis and fix
Impalas frequently throw a cluster of warnings at once — 'Engine Power Reduced,' 'Service StabiliTrak,' and 'Service Traction Control' — that are usually one underlying drive-by-wire fault rather than three separate failures. The most common root cause is the electronic throttle body actuator (or the dual throttle-position sensors inside it) going out of range; the accelerator pedal position sensors can also disagree. Because the ECM cross-checks these dual sensors, any disagreement forces the car into limp-home mode with drastically reduced power. Carbon buildup on the throttle plate aggravates it, especially in cold weather.
Common Symptoms
- 'Engine Power Reduced' message with limp-home mode
- 'Service StabiliTrak' and 'Service Traction Control' lights together
- Sudden loss of acceleration
- Rough or surging idle, worse in cold weather
- Intermittent recovery after key cycle
How to Fix
Scan for throttle/pedal DTCs before replacing parts. Start by cleaning the throttle body (a frequent cause, cheap fix). If codes/symptoms persist, replace the electronic throttle body assembly (ACDelco 12670981 fits the 2012-2013 3.6L; verify the correct unit for your engine/year). Some 3.6L applications require a relearn/idle relearn after replacement. If the pedal sensors are at fault, replace the accelerator pedal position sensor assembly.
Sources for this issue (2)
P0222 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0222 mean on a Chevrolet?
P0222 stands for "Throttle/Pedal Position Sensor/Switch B Circuit Low Input." The PCM detected that the 'B' throttle/pedal position sensor signal voltage is below the expected minimum (short to ground or open). The implausibly low reading typically triggers reduced-power protection. On Chevrolet it is documented across 1 model: Impala.
What are the most common causes of P0222?
The most common causes of P0222 are: Short to ground in the B signal circuit, Open reference (5V) supply to the sensor, Faulty throttle/pedal position sensor (B), Corroded or loose connector, PCM fault. The specific cause varies by vehicle.
How much does it cost to fix P0222 on a Chevrolet?
Published repair estimates on Chevrolet range from $100 to $450 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.