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Engine-Codes – Generic – C1855

C1855 Code - Acceleration Position Sensor Conflict

Quick Answer

The C1855 diagnostic trouble code (DTC) indicates an Acceleration Position Sensor Conflict. Common causes include Faulty acceleration position sensor, Wiring issues or shorts in the sensor circuit, Corrosion or poor connections in the sensor wiring. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
C1855 indicates Acceleration Position Sensor Conflict.
Common causes
Common causes include Faulty acceleration position sensor, Wiring issues or shorts in the sensor circuit, Corrosion or poor connections in the sensor wiring.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code C1855 Description

The C1855 diagnostic trouble code (DTC) indicates an Acceleration Position Sensor Conflict. This code is typically associated with a discrepancy or conflict between the signals received from the vehicle's acceleration position sensors. Acceleration position sensors are crucial components in modern vehicles as they provide input to the engine control module (ECM) to determine the appropriate fuel delivery and ignition timing for optimal engine performance.

OBDII Code C1855 - Acceleration Position Sensor Conflict
C1855 Code - Acceleration Position Sensor Conflict

Common Causes of C1855

  1. Faulty acceleration position sensor
  2. Wiring issues or shorts in the sensor circuit
  3. Corrosion or poor connections in the sensor wiring
  4. ECM software or hardware issues
  5. Mechanical problems with the accelerator pedal assembly

Symptoms of C1855

  1. Rough idling
  2. Hesitation or jerking during acceleration
  3. Decreased fuel efficiency
  4. Stalling
  5. Check Engine Light illuminated

How to Fix C1855

  1. Begin by connecting a diagnostic scan tool to the vehicle's OBD-II port to retrieve the specific code and confirm the issue.
  2. Inspect the wiring and connections to the acceleration position sensors for any signs of damage, corrosion, or loose connections. Repair or replace any faulty wiring or connectors.
  3. Test the acceleration position sensors using a multimeter to ensure they are functioning within the manufacturer's specified parameters. Replace any sensors that are out of range.
  4. If the sensors are functioning correctly, perform a thorough inspection of the accelerator pedal assembly and associated components for any mechanical issues. Repair or replace any faulty components.
  5. Clear the DTC from the ECM's memory using the diagnostic scan tool and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix C1855

The cost of repairing an Acceleration Position Sensor Conflict can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. In general, the cost of parts for this repair can range from $100 to $300, with labor costs adding an additional $100 to $200. Overall, the total repair cost for addressing the C1855 code typically falls within the range of $200 to $500. It's important to note that these estimates are rough averages, and actual costs may vary based on the vehicle make and model, location, and any additional repairs or parts needed. It's recommended to obtain quotes from local auto repair shops for a more accurate cost estimate.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C1855 Code

1. What are the common symptoms of OBDII code C1855 (Acceleration Position Sensor Conflict)?

- Common symptoms include issues with acceleration responsiveness, unstable engine performance, and potential stalling while driving.

2. What causes the OBDII code C1855 to occur?

- The code C1855 is typically triggered by conflicts or discrepancies between the signals from different acceleration position sensors in the vehicle.

3. How can I diagnose the OBDII code C1855?

- Diagnosis involves using a professional OBDII scanner to read the code, inspecting the acceleration position sensors, and checking for any wiring or connection issues.

4. Can a faulty accelerator pedal position sensor cause the OBDII code C1855?

- Yes, a faulty accelerator pedal position sensor can contribute to triggering the C1855 code due to conflicts with other acceleration position sensors.

5. What are the recommended repair tips for resolving the OBDII code C1855?

- Repair tips may include recalibrating or replacing the acceleration position sensors, ensuring proper wiring connections, and clearing the error code with a diagnostic tool.

6. Is it safe to continue driving with the OBDII code C1855 present?

- It is not recommended to drive with the C1855 code active, as it can lead to potential safety hazards and further damage to the vehicle's engine system.

7. Can a DIY enthusiast resolve the OBDII code C1855 issue at home?

- Depending on the skill level and access to necessary tools, some DIY enthusiasts may be able to address the C1855 code by following repair guides or seeking professional advice.

8. Are there any recalls or technical service bulletins related to the OBDII code C1855?

- It is advisable to check with the vehicle manufacturer or authorized service centers for any recalls or technical service bulletins related to the C1855 code for specific vehicle models.

9. How can I prevent the OBDII code C1855 from recurring in the future?

- Regular maintenance, timely sensor inspections, and addressing any acceleration-related issues promptly can help prevent the recurrence of the C1855 code.

10. Will resetting the OBDII system clear the C1855 code permanently?

- Resetting the OBDII system may temporarily clear the C1855 code, but if the underlying issue causing the code is not addressed, it is likely to reappear.

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