P0221 on Chevrolet
Throttle/Pedal Position Sensor/Switch B Circuit Range/Performance
P0221 on Chevrolet vehicles indicates throttle/pedal position sensor/switch b circuit range/performance. Au7o has documented this code across 1 Chevrolet model — most commonly on Impala. This code means the second throttle or accelerator pedal position sensor (circuit B) is sending a signal that is out of the expected range or does not track properly with the other sensor. Modern drive-by-wire systems use redundant sensors, and the computer compares them for agreement. When sensor B's voltage is implausible or inconsistent, this code sets. It can cause hesitation, surging, reduced power, or a forced limp mode for safety. Typical repair costs on Chevrolet range from $100 to $450, depending on the specific model and root cause.
Common Causes of P0221
- •Faulty throttle position sensor (sensor B)
- •Faulty accelerator pedal position sensor
- •Dirty or worn throttle body
- •Wiring or connector problems (corrosion, chafing)
- •Poor ground or reference voltage to the sensor
- •Intermittent open or short in the signal circuit
- •Faulty PCM/ECM (rare)
P0221 on Chevrolet by Model
Chevrolet Impala(1 issue)
- Reduced Engine Power / Service StabiliTrak from Throttle Body Failure2006-2016
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.
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View P0221 across all makes →Frequently Asked Questions
What does P0221 mean on Chevrolet?▼
P0221 stands for "Throttle/Pedal Position Sensor/Switch B Circuit Range/Performance." This code means the second throttle or accelerator pedal position sensor (circuit B) is sending a signal that is out of the expected range or does not track properly with the other sensor. Modern drive-by-wire systems use redundant sensors, and the computer compares them for agreement. When sensor B's voltage is implausible or inconsistent, this code sets. It can cause hesitation, surging, reduced power, or a forced limp mode for safety. On Chevrolet specifically, this code is documented across 1 model.
What causes P0221 on Chevrolet vehicles?▼
Common causes on Chevrolet: Faulty throttle position sensor (sensor B), Faulty accelerator pedal position sensor, Dirty or worn throttle body, Wiring or connector problems (corrosion, chafing), Poor ground or reference voltage to the sensor. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0221 on a Chevrolet?▼
Repair costs on Chevrolet range from $100 to $450, depending on the specific model and root cause.
Which Chevrolet models have P0221 documented?▼
Au7o has documented P0221 on 1 Chevrolet model: Impala.