B3125 2015 GMC Sierra Code - Driver Door Only Unlock Circuit
Quick Answer
The Body Control Module (BCM) supplies a 12-volt signal to the lock and unlock signal circuits of the driver and passenger door lock switches. Common causes include Faulty Driver Door Latch Assembly, Driver Door Latch Assembly harness is open or shorted, Driver Door Latch Assembly 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
- B3125 2015 GMC Sierra indicates Driver Door Only Unlock Circuit.
- Common causes
- Common causes include Faulty Driver Door Latch Assembly, Driver Door Latch Assembly harness is open or shorted, Driver Door Latch Assembly 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 B3125 2015 GMC Sierra Description
The BCM, upon receipt of a lock switch lock or unlock signal, will supply voltage to the door lock actuator lock or unlock control circuits. Since the opposite side of the lock actuator is connected to the ground through the other lock actuator control circuit, the doors will then lock or unlock as commanded. The Diagnostic Trouble Code (DTC) sets when the BCM detects a short to ground or open/high resistance on a door latch control circuit.
What are the Possible Causes of the DTC B3125 2015 GMC Sierra?
- Faulty Driver Door Latch Assembly
- Driver Door Latch Assembly harness is open or shorted
- Driver Door Latch Assembly circuit poor electrical connection
- Faulty Body Control Module (BCM)
How to Fix the DTC B3125 2015 GMC Sierra?
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 B3125 2015 GMC Sierra 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 B3125 2015 GMC Sierra Code
1. What does the OBDII code B3125 mean on a 2015 GMC Sierra?
The B3125 code indicates an issue with the Driver Door Only Unlock Circuit, which controls the unlocking function for the driver’s door.
2. What are common symptoms of the B3125 code in a 2015 GMC Sierra?
Symptoms include the driver’s door failing to unlock with the key fob or door switch, other doors unlocking normally, or intermittent unlocking issues.
3. What causes the B3125 code to appear in a GMC Sierra?
Common causes include a faulty door lock actuator, damaged wiring or connectors in the unlock circuit, or a malfunctioning Body Control Module (BCM).
4. How can I diagnose the B3125 code on my 2015 GMC Sierra?
Start by inspecting the wiring and connectors for damage or corrosion, test the driver door lock actuator for proper operation, and check for BCM software updates or glitches.
5. Can I still drive my GMC Sierra with the B3125 code?
Yes, but the driver door unlock function may not work properly, which can be inconvenient and potentially a safety concern.
6. How do I fix the B3125 code on my 2015 GMC Sierra?
Repairs may include replacing the driver door lock actuator, repairing damaged wiring or connectors, or reprogramming or replacing the BCM.
7. How much does it cost to fix the B3125 code in a GMC Sierra?
The cost varies depending on the issue. Replacing a door lock actuator can cost $150–$300, while BCM repairs or replacements may cost $300–$800.
8. Can a dead battery cause the B3125 code on a GMC Sierra?
A dead or weak battery can cause communication issues or voltage drops, which may trigger this code. Ensure the battery is fully charged before further diagnosis.
9. Is it necessary to reprogram the BCM when fixing the B3125 code?
Reprogramming is only necessary if the BCM is faulty or has outdated software contributing to the issue.
10. Can I clear the B3125 code without fixing the problem?
Clearing the code without addressing the underlying issue may temporarily reset the system, but the code is likely to return until the problem is resolved.
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