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P2122 Throttle Actuator Control
Pedal Position Sensor / Switch D Circuit Low Input
P2122 means the accelerator pedal position sensor D circuit read voltage below the expected range, indicating a short to ground or an open in that sensor circuit.
🚗 Not recommended. A low pedal signal can force limp mode.
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🎯 Top Causes, Ranked by Likelihood
#1 Failed accelerator pedal position sensor $100-$400
A shorted or open sensor element reads low.
#2 Wiring shorted to ground or open $50-$300
A short to ground or broken wire pulls the signal low.
#3 Corroded pedal connector $0-$150
Corrosion causes a low or lost signal.
#4 Poor 5V reference or ground $50-$300
A missing reference drops the sensor voltage.
🩺 Common Symptoms Reduced power / limp mode Check engine light Poor throttle response Hesitation Erratic idle 💰 Repair Cost: DIY vs Shop
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🔧 How to Diagnose P2122 1 Read live data for the pedal position sensor circuit
2 Inspect the pedal connector and wiring for shorts to ground
3 Test the 5V reference and ground
4 Replace the pedal position sensor if the signal stays low
❓ Frequently Asked Questions Can I drive with a P2122 code?
Avoid it. A low pedal signal commonly forces limp mode with reduced power.
How much does it cost to fix P2122?
A pedal position sensor replacement typically runs $150-$600 at a shop.
What causes P2122?
Usually a failed pedal sensor or a wire shorted to ground in the sensor circuit.
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