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Pedal Position Sensor C Circuit Intermittent

Jump to the fix

Severity

Medium

Can I keep driving?

Usually drivable, but get it diagnosed without delay.

First step

Graph both pedal signals on the scan tool and press the pedal slowly through its full travel, watching for a dropout

  • PPowertrain
  • 1Manufacturer-specific
  • 2Powertrain (Other)
  • 22Sequence number

What does it mean?

P1222 is a Powertrain (engine, transmission, fuel system) fault code. It indicates: Accelerator Pedal Position Sensor ‘E’ Circuit Low Input .

Symptoms

  • Check engine lamp on and the vehicle drops into limp mode
  • Sharply reduced power, sometimes only idle speed available
  • No response or delayed response when the pedal is pressed
  • Cruise control disabled and idle speed possibly raised
  • Fault can appear when the pedal is moved through a particular part of its travel

Likely causes

  • Signal wire shorted to ground or chafed against the bodywork behind the pedal box
  • Open or missing 5 volt reference to the pedal sensor
  • Worn internal track or failed hall element in the pedal position sensor
  • Water or drink spillage into the pedal connector, a common cause in the footwell
  • Loose, corroded or pushed-back terminals in the sensor connector
  • Damaged sensor input inside the module
  • Floor mat or carpet trapping the pedal and stressing the harness

How to fix it

  1. Graph both pedal signals on the scan tool and press the pedal slowly through its full travel, watching for a dropout
  2. Measure the 5 volt reference and sensor ground at the pedal connector with the ignition on
  3. Inspect the connector and the footwell for moisture, corrosion and terminal damage
  4. Check the signal wire for continuity to the module and for a short to ground
  5. Wiggle the harness behind the pedal while watching live data
  6. Renew the pedal position sensor assembly once wiring, reference and ground test correct, then relearn the pedal if required
  7. Check the module input as the final step

Codes From the Same System

All Fault Codes

Related Similar Codes

This information follows the generic OBD-II definition and does not replace a vehicle-specific diagnosis. The severity rating is rule-based; an authorised diagnostic reading is required for a definitive answer.