B1970 GMC Code - Exterior Ligth Power Fault
Quick Answer
The Body Control Module (BCM) commands exterior lights on by energizing Low Beam and Parking Light Relays. Common causes include Faulty Low Beam and Parking Light Relay, Low Beam and Parking Light Relay harness is open or shorted, Low Beam and Parking Light 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
- B1970 GMC indicates Exterior Ligth Power Fault.
- Common causes
- Common causes include Faulty Low Beam and Parking Light Relay, Low Beam and Parking Light Relay harness is open or shorted, Low Beam and Parking Light 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 B1970 GMC Description
What are the Possible Causes of the DTC B1970 GMC?
- Faulty Low Beam and Parking Light Relay
- Low Beam and Parking Light Relay harness is open or shorted
- Low Beam and Parking Light Relay circuit poor electrical connection
- Faulty Body Control Module (BCM)
How to Fix the DTC B1970 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 B1970 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 B1970 GMC Code
1. What are common symptoms of OBDII code B1970 GMC (Exterior Light Power Fault)?
The common symptoms include malfunctioning exterior lights such as headlights, taillights, brake lights, or turn signals.
2. What are possible causes of OBDII code B1970 GMC (Exterior Light Power Fault)?
Possible causes include faulty wiring, a damaged light control module, a blown fuse, or a defective light bulb.
3. How can I diagnose the OBDII code B1970 GMC (Exterior Light Power Fault)?
Diagnose the code by visually inspecting the exterior lights, checking the wiring and connections, testing the light control module, and using a diagnostic scanner to retrieve trouble codes.
4. How can I repair OBDII code B1970 GMC (Exterior Light Power Fault)?
Repair the code by replacing any faulty light bulbs, repairing damaged wiring, replacing the light control module if necessary, and ensuring all connections are secure.
5. Can a blown fuse cause OBDII code B1970 GMC (Exterior Light Power Fault)?
Yes, a blown fuse can cause this code as it disrupts the power supply to the exterior lights, triggering the fault.
6. Is it safe to continue driving with OBDII code B1970 GMC (Exterior Light Power Fault)?
It is not recommended to drive with this code as malfunctioning exterior lights can compromise your safety on the road.
7. Why is it important to promptly address OBDII code B1970 GMC (Exterior Light Power Fault)?
Promptly addressing this code ensures proper functioning of your exterior lights, which is crucial for visibility and signaling to other drivers.
8. Can a DIY enthusiast fix OBDII code B1970 GMC (Exterior Light Power Fault)?
Depending on their skill level, a DIY enthusiast may be able to fix this code by following repair guides and using the necessary tools.
9. How can I prevent OBDII code B1970 GMC (Exterior Light Power Fault) from recurring?
Regularly inspecting and maintaining your exterior lights, checking the wiring for any wear or damage, and ensuring proper connections can help prevent this code from recurring.
10. Will resetting the OBDII system clear OBDII code B1970 GMC (Exterior Light Power Fault)?
Resetting the OBDII system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear.
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