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B1970 Chevrolet Code - Exterior Ligth Power Fault

Quick Answer

The B1970 code indicates an "Exterior Light Power Fault" in Chevrolet vehicles, which typically pertains to issues with the vehicle's lighting system, specifically the exterior lights such as headlights, taillights, turn signals, and marker lights. Common causes include Faulty Body Control Module (BCM) that fails to send power to the lights, Damaged or corroded wiring harness or connectors affecting power delivery, Burnt-out bulbs that may cause a feedback loop in the system. 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 Body Control Module (BCM) that fails to send power to the lights, Damaged or corroded wiring harness or connectors affecting power delivery, Burnt-out bulbs that may cause a feedback loop in the system.
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 Oct 18, 2024
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Code B1970 Chevrolet Description

The B1970 code indicates an "Exterior Light Power Fault" in Chevrolet vehicles, which typically pertains to issues with the vehicle's lighting system, specifically the exterior lights such as headlights, taillights, turn signals, and marker lights. This code is generated when the vehicle's onboard diagnostic system detects a malfunction in the power supply to these lights, which can significantly impact visibility and safety during driving.

OBDII Code B1970 Chevrolet - Exterior Ligth Power Fault
B1970 Chevrolet Code - Exterior Ligth Power Fault

Common Causes of B1970 Chevrolet

  1. Faulty Body Control Module (BCM) that fails to send power to the lights.
  2. Damaged or corroded wiring harness or connectors affecting power delivery.
  3. Burnt-out bulbs that may cause a feedback loop in the system.
  4. Short circuits or open circuits in the lighting circuit.
  5. Issues with the vehicle's battery or alternator affecting overall electrical performance.

Symptoms of B1970 Chevrolet

  1. Dim or flickering exterior lights.
  2. Complete failure of one or more exterior lights.
  3. Intermittent operation of turn signals or brake lights.
  4. Dashboard warning lights related to exterior lighting.
  5. Difficulty in starting the vehicle, as some systems may be interconnected.

How to Fix B1970 Chevrolet

  1. Diagnostic Scan: Use an OBD-II scanner to confirm the B1970 code and check for any additional codes that may provide further insight into the issue.
  2. Visual Inspection: Examine the wiring harness and connectors associated with the exterior lights for any signs of damage, corrosion, or loose connections.
  3. Test the BCM: Using a multimeter, check the BCM for proper voltage output to the exterior light circuits. If the BCM is faulty, it may need to be reprogrammed or replaced.
  4. Replace Bulbs: Inspect all exterior bulbs and replace any that are burnt out or damaged, as this can sometimes resolve the issue.
  5. Repair or Replace Wiring: If damaged wiring or connectors are found, repair or replace them as necessary to restore proper electrical flow.

Cost to Fix B1970 Chevrolet

Repair costs for addressing a B1970 code can vary widely based on the specific diagnosis and repairs needed. On average, you might expect to pay between $100 and $400 for repairs, which could include parts such as a new BCM, wiring harness, or bulbs, along with labor costs. Labor rates typically range from $80 to $150 per hour, but this can vary significantly based on location, vehicle make and model, and engine type. In metropolitan areas or at dealerships, rates may be higher, while independent shops may offer lower rates. It’s advisable to check local rates for a more precise estimate and to obtain multiple quotes if possible.

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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.

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