AutoCodes – Chevrolet – B1970 Chevrolet

B1970 Chevrolet 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 Chevrolet 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 575

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 01, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B1970 Chevrolet Description

The Body Control Module (BCM) commands exterior lights on by energizing Low Beam and Parking Light Relays. The Diagnostic Trouble Code (DTC) B1970 will set when exterior lights have been commanded on and BCM detects low voltage (short to ground) in the wire between BCM and relays. When DTC B1970 is set, BCM will command exterior lights off, and then attempt to turn exterior lights on until lights are no longer requested. DTC B1970 will clear when conditions for fault no longer exist or when scan tool is used. A history DTC will clear after 50 consecutive ignition cycles if conditions for fault no longer exist.

OBDII Code B1970 Chevrolet - Exterior Ligth Power Fault - AutoCodes.com — B1970 Chevrolet Code - Exterior Ligth Power Fault

What does this mean?

What are the Possible Causes of the DTC B1970 Chevrolet?

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 Chevrolet?

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 Chevrolet 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.

Need more information about the B1970 Chevrolet code?

Need more information on how to fix the B1970 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1970 Chevrolet code diagnosed by a professional: Find a repair shop in your area

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 B1970 Chevrolet Code

1. What does OBDII code B1970 for Chevrolet indicate?

This code, "Exterior Light Power Fault," typically points to an issue with the power supply to the exterior lights in the Chevrolet vehicle.

2. What are the common symptoms of OBDII code B1970 in a Chevrolet?

Common symptoms include exterior lights not working properly or not turning on at all, such as headlights, taillights, or brake lights.

3. What are the possible causes of OBDII code B1970 in a Chevrolet?

Causes may include a blown fuse, a faulty light switch, a wiring issue, a malfunctioning light control module, or a problem with the vehicle's electrical system.

4. How can I diagnose the OBDII code B1970 in my Chevrolet?

To diagnose this code, you may need to visually inspect the exterior lights, check the fuses related to the lights, test the light switch, and use a diagnostic scanner to read the trouble codes.

5. What are some repair tips for fixing OBDII code B1970 in a Chevrolet?

Start by checking and replacing any blown fuses related to the exterior lights. Inspect the wiring for any signs of damage or corrosion. Test the light switch and replace it if necessary.

6. Can OBDII code B1970 in a Chevrolet be fixed at home, or should I take it to a mechanic?

Depending on your automotive repair skills and the complexity of the issue, you may be able to fix this code at home by following diagnostic steps and replacing faulty components. If you are unsure, it's recommended to seek help from a qualified mechanic.

7. Is it safe to continue driving with OBDII code B1970 present in a Chevrolet?

It is not recommended to drive with exterior lights malfunctioning, as they are essential for visibility and safety on the road. Addressing the issue promptly is important.

8. Could a recent repair or modification have triggered OBDII code B1970 in my Chevrolet?

Yes, if any recent work involved the exterior lights, wiring, or electrical system, it is possible that a mistake or issue during the repair or modification could have triggered this fault code.

9. Are there any recalls or technical service bulletins related to OBDII code B1970 in Chevrolet vehicles?

Check with Chevrolet or a local dealership to inquire about any recalls or technical service bulletins related to this specific code, as they may provide valuable information or potential solutions.

10. How can I reset the OBDII code B1970 in my Chevrolet after fixing the issue?

Once the issue causing the code has been addressed, you can reset the code using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes to clear the trouble code from the system.