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B1818 Chrysler Code - Rear Passenger Door Ajar Circuit Short

Quick Answer

The B1818 Chrysler code indicates a problem with the rear passenger door ajar circuit, specifically a short circuit. Common causes include Damaged wiring harness in the rear passenger door, Pinched or exposed wires in the circuit, Faulty rear passenger door ajar sensor. 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
B1818 Chrysler indicates Rear Passenger Door Ajar Circuit Short.
Common causes
Common causes include Damaged wiring harness in the rear passenger door, Pinched or exposed wires in the circuit, Faulty rear passenger door ajar sensor.
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 19, 2024
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Code B1818 Chrysler Description

The B1818 Chrysler code indicates a problem with the rear passenger door ajar circuit, specifically a short circuit. This means that the vehicle's computer has detected an abnormal electrical flow in the circuit responsible for monitoring the status of the rear passenger door. When the door is closed, the circuit should be intact, but a short circuit can disrupt this normal operation.

OBDII Code B1818 Chrysler - Rear Passenger Door Ajar Circuit Short
B1818 Chrysler Code - Rear Passenger Door Ajar Circuit Short

Common Causes of B1818 Chrysler

  1. Damaged wiring harness in the rear passenger door.
  2. Pinched or exposed wires in the circuit.
  3. Faulty rear passenger door ajar sensor.
  4. Corrosion or loose connections in the circuit.
  5. Previous repairs or modifications that affected the circuit.

Symptoms of B1818 Chrysler

  1. Interior lights staying on when the rear passenger door is closed.
  2. False door ajar warning on the instrument cluster.
  3. Power door locks not functioning properly.
  4. Battery draining unexpectedly.

How to Fix B1818 Chrysler

  1. Begin by visually inspecting the wiring harness in the rear passenger door for any signs of damage or wear. Repair or replace any damaged wires.
  2. Check the rear passenger door ajar sensor for proper operation. Replace the sensor if it is faulty.
  3. Test the circuit for continuity and resistance to identify the location of the short circuit. Repair or replace any affected components.
  4. Clear the diagnostic trouble codes from the vehicle's computer using a scan tool.
  5. Test the system to ensure the issue has been resolved and that the door status is being accurately detected.

Cost to Fix B1818 Chrysler

The typical repair costs for addressing a B1818 Chrysler code can vary depending on the extent of the damage and the specific components that need to be replaced. In general, the parts required for this repair, such as a new door ajar sensor or wiring harness, can range from $50 to $200. Labor costs at an auto repair shop can add an additional $100 to $300 to the total bill. Overall, the total cost for resolving this issue can range from $150 to $500.

What does this mean?

Tech Notes for B1818 Chrysler

B1818-11 REAR PASSENGER DOOR AJAR CIRCUIT SHORT TO GROUND

B1818-15 REAR PASSENGER DOOR AJAR CIRCUIT SHORT TO BATTERY OR OPEN

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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 B1818 Chrysler Code

1. What are the common symptoms of OBDII code B1818 Chrysler related to the rear passenger door ajar circuit short?

The common symptoms include the rear passenger door indicator staying on when the door is closed, interior lights staying on, and potential issues with power door locks.

2. What are the possible causes of OBDII code B1818 Chrysler indicating a rear passenger door ajar circuit short?

Possible causes include a faulty door ajar switch, damaged wiring in the door jamb, a malfunctioning body control module (BCM), or a short circuit in the wiring harness.

3. How can I diagnose the issue causing OBDII code B1818 Chrysler for the rear passenger door ajar circuit short?

You can diagnose the issue by visually inspecting the door ajar switch and wiring, performing a continuity test on the switch, checking the BCM for faults, and using a scan tool to monitor sensor readings.

4. Can I repair OBDII code B1818 Chrysler related to the rear passenger door ajar circuit short myself?

Depending on your level of expertise, you may be able to repair the issue yourself by replacing the door ajar switch, repairing damaged wiring, or resetting the BCM. However, seeking professional help is recommended for complex issues.

5. Are there any temporary fixes for OBDII code B1818 Chrysler until I can get the rear passenger door ajar circuit short repaired?

You can try manually locking the door to override the sensor, disconnecting the battery to reset the BCM, or using electrical tape to secure loose wiring temporarily. However, these are not permanent solutions.

6. How important is it to address OBDII code B1818 Chrysler indicating a rear passenger door ajar circuit short promptly?

It is important to address the issue promptly to prevent draining the vehicle's battery, potential safety hazards due to interior lights staying on, and to ensure proper functioning of the door locks.

7. Can OBDII code B1818 Chrysler for the rear passenger door ajar circuit short cause any other electrical problems in the vehicle?

Yes, if left unresolved, the issue can potentially cause other electrical problems such as BCM malfunctions, power door lock failures, and issues with the vehicle's lighting system.

8. Is it safe to continue driving with OBDII code B1818 Chrysler related to the rear passenger door ajar circuit short?

While it may be safe to drive in the short term, it is not recommended to ignore the issue as it can lead to electrical malfunctions and safety hazards. It is best to address the problem as soon as possible.

9. How long does it typically take to repair OBDII code B1818 Chrysler for the rear passenger door ajar circuit short?

The repair time can vary depending on the specific cause of the issue, but it may take anywhere from 1-3 hours for a professional technician to diagnose and fix the problem.

10. Will resetting the OBDII system clear the B1818 Chrysler code for the rear passenger door ajar circuit short?

Resetting the OBDII system may temporarily clear the code, but it will likely return if the underlying issue is not addressed. It is important to diagnose and repair the root cause of the problem to prevent the code from reappearing.

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