B3808 GMC Code - Rear Door Lock Relay Circuit
Quick Answer
The Body Control Module (BCM) internally grounds the door lock relay control circuit for the rear door lock relay when it receives a class 2 message from the driver door module (DDM) or passenger door module (PDM). Common causes include Faulty Rear Door Lock Relay, Rear Door Lock Relay harness is open or shorted, Rear Door Lock Relay circuit poor electrical connection. 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 GMC indicates Rear Door Lock Relay Circuit.
- Common causes
- Common causes include Faulty Rear Door Lock Relay, Rear Door Lock Relay harness is open or shorted, Rear Door Lock Relay circuit poor electrical connection.
- 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.
Code B3808 GMC Description
What are the Possible Causes of the DTC B3808 GMC?
- Faulty Rear Door Lock Relay
- Rear Door Lock Relay harness is open or shorted
- Rear Door Lock Relay circuit poor electrical connection
- Faulty Body Control Module (BCM)
How to Fix the DTC B3808 GMC?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B3808 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about B3808 GMC Code
1. What does the OBDII code B3808 mean on a GMC?
Code B3808 indicates an issue with the rear door lock relay circuit, which may involve a malfunction in the wiring, relay, or associated components controlling the rear door locks.
2. What are common symptoms of the B3808 code on a GMC vehicle?
Symptoms may include rear door locks not responding to key fob or switch commands, intermittent locking/unlocking, or no audible clicking sound from the rear door lock relay.
3. What causes the B3808 code to appear?
The code can be caused by a faulty rear door lock relay, damaged or corroded wiring, a blown fuse, or a malfunctioning body control module (BCM).
4. How can I diagnose the B3808 code on my GMC?
Start by checking the rear door lock relay and wiring for damage or corrosion. Use a multimeter to test for proper voltage and continuity in the circuit. Additionally, scan the BCM for any related codes.
5. Can I drive my GMC with the B3808 code active?
Yes, you can drive the vehicle, but the rear door locks may not function correctly, potentially affecting security or convenience.
6. How do I fix the B3808 code on my GMC?
Repair or replace the rear door lock relay if it's faulty. Inspect and repair any damaged wiring or connectors, and verify the BCM is functioning properly.
7. Is the B3808 code related to other door lock issues?
Yes, it could be related to other door lock malfunctions if the issue stems from a central control module or shared wiring components.
8. How much does it cost to repair the B3808 code on a GMC?
The cost can vary depending on the cause. Replacing a relay typically costs $50–$100, while wiring or module repairs may range from $100–$500.
9. Can a blown fuse cause the B3808 code?
Yes, a blown fuse in the door lock circuit can disrupt the relay’s operation and trigger the B3808 code.
10. Does the B3808 code require programming after repairs?
If the BCM or other electronic components are replaced, reprogramming may be necessary using a scan tool to ensure proper operation of the door lock system.
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