OBD Guide
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C1855

Acceleration Position Sensor Conflict

C1855 is an OBD-II diagnostic trouble code meaning: Acceleration Position Sensor Conflict. Common causes: malfunction of the accelerator pedal position sensor, wiring harness damage. Estimated repair cost: $33–111.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–111 (est.)

Symptoms

  • Engine transition to emergency mode
  • Reduced engine power
  • Unstable operation of the accelerator pedal
  • Check Engine Light Illuminates

Causes

  • Malfunction of the accelerator pedal position sensor
  • Wiring harness damage
  • Poor contact or corrosion in connectors
  • Grounding problems
  • ECU software error

How to Fix

  1. Check the condition of the wiring harness and sensor connectors
  2. Check the resistance and signals of the pedal position sensors
  3. Check the integrity of the grounding circuit
  4. If necessary, replace the faulty sensor
  5. Update ECU software (if required)

Related codes

P2122P2123P2127P2128

FAQ

What does the C1855 code mean?

C1855 is an OBD-II diagnostic trouble code that indicates: Acceleration Position Sensor Conflict

What causes a C1855 error code?

The most common causes of C1855 include: Malfunction of the accelerator pedal position sensor; Wiring harness damage; Poor contact or corrosion in connectors; Grounding problems.

How do I fix a C1855 diagnostic trouble code?

To fix C1855: Check the condition of the wiring harness and sensor connectors. Check the resistance and signals of the pedal position sensors. Check the integrity of the grounding circuit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1855?

Limited driving only, diagnose soon

How much does it cost to fix C1855?

The estimated repair cost for C1855 is $33–111. Actual cost depends on your vehicle, location, and labor rates.

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