What Does P1222 Mean?
P1222 indicates an intermittent signal from the Accelerator Pedal Position Sensor C circuit. On vehicles with triple-redundant pedal sensors (A, B, and C), the ECM has detected erratic, dropped, or spiking voltage from the third sensor. This level of redundancy is typically found on newer vehicles with advanced drive-by-wire throttle systems, and any sensor fault will trigger a failsafe response.
Safety Warning
Intermittent pedal sensor faults may cause sudden reduced-power mode or limp-home activation, creating unexpected deceleration. Conflicting signals between the three sensors can cause the ECM to shut down throttle control as a safety measure, leaving the driver with minimal or no throttle response.
Common Causes
30%
Worn accelerator pedal position sensor assembly with intermittent internal contact on sensor C
25%
Corroded or loose connector terminals at the pedal sensor assembly
20%
Wiring damage or chafing in the sensor C signal circuit
15%
Intermittent ground or reference voltage fault affecting sensor C
10%
Moisture or contamination inside the pedal position sensor housing
Diagnostic Steps
1
Monitor all three pedal position sensor signals simultaneously on a scan tool while slowly modulating the pedal. Identify signal C for any dropouts, spikes, or deviations from sensors A and B.
2
Inspect the accelerator pedal connector for corrosion, moisture, bent or backed-out pins, and proper connector lock engagement.
3
Wiggle-test the pedal connector and harness while monitoring sensor C live data to reproduce the intermittent fault.
4
Verify the reference voltage and ground at the sensor connector are stable and within specification under load.
5
Inspect the wiring harness from the pedal through the firewall for pinch points, chafing, or areas of repeated flexing.
6
Replace the accelerator pedal assembly if the sensor is integrated (most modern designs), as individual sensor replacement is not supported.
Estimated Repair Cost
$150 - $500
Parts + labor, varies by vehicle and location
P1222 indicates an intermittent signal from the Accelerator Pedal Position Sensor C circuit. On vehicles with triple-redundant pedal sensors (A, B, and C), the ECM has detected erratic, dropped, or spiking voltage from the third sensor. This level of redundancy is typically found on newer vehicles w...
The most common cause of P1222 (Pedal Position Sensor C Circuit Intermittent) is: Worn accelerator pedal position sensor assembly with intermittent internal contact on sensor C
Typical repair costs for P1222 range from $150 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Intermittent pedal sensor faults may cause sudden reduced-power mode or limp-home activation, creating unexpected deceleration. Conflicting signals between the three sensors can cause the ECM to shut down throttle control as a safety measure, leaving the driver with minimal or no throttle response.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1222 to identify the root cause.
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Quick Info
Category
Powertrain
System
Electronic Throttle Control / Drive-by-Wire
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