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Engine-Codes – Generic – B3808

B3808 Code - Rear Door Lock Relay Circuit

Quick Answer

The B3808 code indicates a problem with the rear door lock relay circuit in the vehicle. Common causes include Wiring harness damage or short circuit, Faulty rear door lock actuator, Defective rear door lock relay. 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
B3808 indicates Rear Door Lock Relay Circuit.
Common causes
Common causes include Wiring harness damage or short circuit, Faulty rear door lock actuator, Defective rear door lock relay.
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 10, 2024
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Code B3808 Description

The B3808 code indicates a problem with the rear door lock relay circuit in the vehicle. This code is typically found in vehicles with power door locks, where the relay is responsible for controlling the locking and unlocking of the rear doors. When this circuit malfunctions, it can lead to issues with the rear door locks, affecting the convenience and security of the vehicle.

OBDII Code B3808 - Rear Door Lock Relay Circuit
B3808 Code - Rear Door Lock Relay Circuit

Common Causes of B3808

  1. Wiring harness damage or short circuit.
  2. Faulty rear door lock actuator.
  3. Defective rear door lock relay.
  4. Issues with the body control module (BCM).
  5. Corrosion or poor connections in the rear door lock circuit.

Symptoms of B3808

  1. Rear doors fail to lock or unlock using the key fob or interior switch.
  2. Unusual clicking sounds from the rear door when attempting to lock or unlock.
  3. Inconsistent operation of the rear door locks.
  4. Malfunction indicator lamp (MIL) illuminated on the dashboard.

How to Fix B3808

  1. Diagnose the specific cause of the B3808 code using a diagnostic scanner.
  2. Inspect the wiring harness for any damage or shorts and repair or replace as necessary.
  3. Check the rear door lock actuator for proper operation and replace if faulty.
  4. Test the rear door lock relay and replace if found to be defective.
  5. Verify the operation of the rear door locks after repairs are completed.

Cost to Fix B3808

The cost of repairing the rear door lock relay circuit can vary depending on the specific cause of the issue and the parts needed for repairs. On average, the repair costs for this issue can range from $100 to $300, including parts and labor. It's important to note that labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. Factors such as the vehicle make and model, location, and the extent of the repair needed can all impact the final cost. It's recommended to consult with a qualified mechanic to get an accurate estimate for the repair.

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Code B3808 Information for Specific Makes

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 B3808 Code

1. What does OBDII code B3808 mean?

B3808 indicates an issue with the rear door lock relay circuit, which controls the locking and unlocking function of the rear doors.

2. What are common symptoms of code B3808?

Symptoms include rear door locks not functioning, difficulty locking or unlocking the rear doors, and possible malfunction of the key fob or lock button.

3. What causes the B3808 code to appear?

Common causes include a faulty rear door lock relay, damaged wiring or connectors in the circuit, or a malfunctioning body control module (BCM).

4. How can I diagnose the B3808 code?

Start by checking the rear door lock relay, inspecting the wiring and connectors for damage, and testing the circuit with a multimeter to confirm proper voltage and continuity.

5. Can a blown fuse cause the B3808 code?

Yes, a blown fuse in the door lock control circuit can disrupt power to the relay and trigger this code.

6. Is it safe to drive with the B3808 code active?

Yes, it is generally safe to drive, but the rear door locks may not function properly, which could be a security concern.

7. How do I fix the B3808 code?

Repairs may include replacing the rear door lock relay, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the BCM if needed.

8. How much does it cost to fix the B3808 code?

Repair costs vary but may range from $50 to $200 for a relay replacement. Wiring repairs or BCM replacement could increase costs significantly.

9. Can I fix the B3808 code myself?

If you’re comfortable working with electrical components, you can inspect and replace the relay or repair wiring. Otherwise, professional diagnosis and repair are recommended.

10. Will clearing the B3808 code with a scanner solve the problem?

Clearing the code may temporarily reset the system, but the underlying issue must be addressed to prevent the code from returning.

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