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B1812 Dodge Code - Passenger Door Ajar Circuit Short

Quick Answer

The B1812 diagnostic trouble code (DTC) for Dodge vehicles indicates a problem with the passenger door ajar circuit, specifically a short circuit. Common causes include Faulty door ajar switch, Wiring issues in the passenger door ajar circuit, Short circuit in the wiring harness. 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
B1812 Dodge indicates Passenger Door Ajar Circuit Short .
Common causes
Common causes include Faulty door ajar switch, Wiring issues in the passenger door ajar circuit, Short circuit in the wiring harness.
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 29, 2024
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Code B1812 Dodge Description

The B1812 diagnostic trouble code (DTC) for Dodge vehicles indicates a problem with the passenger door ajar circuit, specifically a short circuit. This code is triggered when the Body Control Module (BCM) detects an abnormal voltage or resistance in the circuit responsible for monitoring the status of the passenger door. The passenger door ajar circuit is part of the vehicle's safety and security system, as it is designed to alert the driver if a door is not properly closed.

OBDII Code B1812 Dodge - Passenger Door Ajar Circuit Short
B1812 Dodge Code - Passenger Door Ajar Circuit Short

Common Causes of B1812 Dodge

  1. Faulty door ajar switch
  2. Wiring issues in the passenger door ajar circuit
  3. Short circuit in the wiring harness
  4. BCM malfunction
  5. Corrosion or damage to connectors in the circuit

Symptoms of B1812 Dodge

  1. Dashboard warning light indicating passenger door ajar
  2. Interior lights staying on when the door is closed
  3. Power door locks not functioning properly
  4. Alarm system malfunctions

How to Fix B1812 Dodge

  1. Begin by conducting a visual inspection of the wiring harness and connectors in the passenger door ajar circuit to check for any visible damage or corrosion.
  2. Test the door ajar switch for proper functionality using a multimeter to determine if it is sending the correct signals to the BCM.
  3. If the switch is working correctly, proceed to check the wiring for any shorts or open circuits using a wiring diagram specific to the vehicle.
  4. Repair or replace any damaged wiring or connectors as needed.
  5. Clear the DTC from the BCM memory using a scan tool and perform a final test to ensure the issue has been resolved.

Cost to Fix B1812 Dodge

The typical repair costs for addressing a B1812 code can vary depending on the specific cause of the issue. In general, the parts required for this repair, such as a new door ajar switch or wiring harness, may cost between $50 to $200. Labor costs can range from $100 to $300, depending on the shop's hourly rates and the complexity of the repair. It is advisable to contact local auto repair shops for a more accurate estimate based on your vehicle's make and model. Keep in mind that additional diagnostic time may be necessary to pinpoint the exact cause of the problem.

What does this mean?

Tech Notes for B1812 Dodge

B1812-11 PASSENGER DOOR AJAR CIRCUIT SHORT TO GROUND

B1812-15 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 B1812 Dodge Code

1. What are the common symptoms of OBDII code B1812 for a Dodge related to the Passenger Door Ajar Circuit Short?

The common symptoms include the interior lights staying on, the door ajar warning light appearing on the dashboard, and potential issues with the power door locks.

2. What are the possible causes of OBDII code B1812 indicating a Passenger Door Ajar Circuit Short in a Dodge?

Possible causes include a faulty door ajar switch, damaged wiring or connectors in the circuit, or issues with the body control module.

3. How can I diagnose the Passenger Door Ajar Circuit Short issue causing OBDII code B1812 in my Dodge?

You can diagnose the problem by visually inspecting the door ajar switch, checking the wiring harness and connectors for damage, and using a multimeter to test the continuity of the circuit.

4. Can I repair the Passenger Door Ajar Circuit Short problem associated with OBDII code B1812 in my Dodge myself?

Depending on your experience with automotive repairs, you may be able to fix the issue by replacing the faulty door ajar switch, repairing damaged wiring, or resetting the body control module. If in doubt, consult a professional mechanic.

5. How urgent is it to address OBDII code B1812 related to the Passenger Door Ajar Circuit Short in a Dodge?

While the issue may not affect the drivability of the vehicle, it is important to address it promptly to prevent potential electrical problems and ensure the proper functioning of the door ajar system.

6. Is it safe to continue driving my Dodge with OBDII code B1812 indicating a Passenger Door Ajar Circuit Short?

It is generally safe to drive the vehicle with this code, but you may experience inconvenience due to the interior lights staying on or the door ajar warning light being illuminated. Consider addressing the issue at your earliest convenience.

7. Will resetting the OBDII code B1812 for the Passenger Door Ajar Circuit Short in my Dodge solve the problem?

Resetting the code may temporarily turn off the warning light, but it will not fix the underlying issue causing the circuit short. It is recommended to diagnose and repair the problem to prevent future occurrences.

8. Can extreme weather conditions affect the occurrence of OBDII code B1812 related to the Passenger Door Ajar Circuit Short in a Dodge?

Extreme temperatures or moisture can potentially exacerbate electrical issues in the door ajar circuit, leading to the triggering of this fault code. Ensure proper insulation and protection of wiring in such conditions.

9. How much does it typically cost to repair OBDII code B1812 for the Passenger Door Ajar Circuit Short in a Dodge?

The cost of repairs can vary depending on the specific cause of the issue, but it may involve replacing the door ajar switch, repairing wiring, or resetting the body control module. Expect costs to range from a few hundred to over a thousand dollars.

10. Are there any preventive measures I can take to avoid encountering OBDII code B1812 related to the Passenger Door Ajar Circuit Short in my Dodge?

Regularly inspecting the door ajar system components, keeping connectors clean and secure, and addressing any electrical issues promptly can help prevent the occurrence of this fault code.

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