B2071 Code - Stop Light Control Relay Malfunction
Quick Answer
The B2071 code indicates a malfunction in the stop light control relay in the vehicle. Common causes include Relay failure: The most common cause of the B2071 code is a failure within the stop light control relay itself, such as a burnt-out coil or damaged contacts, Wiring issues: Corrosion, loose connections, or damaged wiring can also lead to a malfunctioning relay, Electrical system problems: Issues with the vehicle's electrical system, such as a faulty fuse or a damaged control module, can impact the operation of the relay. 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
- B2071 indicates Stop Light Control Relay Malfunction.
- Common causes
- Common causes include Relay failure: The most common cause of the B2071 code is a failure within the stop light control relay itself, such as a burnt-out coil or damaged contacts, Wiring issues: Corrosion, loose connections, or damaged wiring can also lead to a malfunctioning relay, Electrical system problems: Issues with the vehicle's electrical system, such as a faulty fuse or a damaged control module, can impact the operation of the relay.
- 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.
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Code B2071 Description
The B2071 code indicates a malfunction in the stop light control relay in the vehicle. The stop light control relay is responsible for controlling the power supply to the stop lights at the rear of the vehicle, which are activated when the brake pedal is pressed. When this relay malfunctions, it can lead to a variety of issues with the vehicle's lighting system, affecting not only the brake lights but potentially other lighting functions as well.
Common Causes of B2071
- Relay failure: The most common cause of the B2071 code is a failure within the stop light control relay itself, such as a burnt-out coil or damaged contacts.
- Wiring issues: Corrosion, loose connections, or damaged wiring can also lead to a malfunctioning relay.
- Electrical system problems: Issues with the vehicle's electrical system, such as a faulty fuse or a damaged control module, can impact the operation of the relay.
- Environmental factors: Exposure to moisture, heat, or other environmental factors can also contribute to the malfunction of the stop light control relay.
Symptoms of B2071
- Brake lights not working: The most obvious symptom of a malfunctioning stop light control relay is the failure of the brake lights to illuminate when the brake pedal is pressed.
- Dim or flickering brake lights: If the brake lights appear dim or flicker inconsistently, it could indicate a problem with the relay.
- Other lighting issues: Malfunctions in the stop light control relay may also affect other lighting functions, such as turn signals or taillights.
- Dashboard warning light: In some cases, the vehicle's dashboard may display a warning light indicating a problem with the stop light control relay.
How to Fix B2071
- Diagnostic testing: Begin by using a diagnostic tool to confirm the B2071 code and identify the specific cause of the malfunction.
- Locate the relay: Locate the stop light control relay in the vehicle, typically found in the fuse box or relay panel.
- Replace the relay: Remove the faulty relay and install a new one, ensuring it is compatible with the vehicle's make and model.
- Check wiring and connections: Inspect the wiring and connections associated with the relay for any damage or corrosion, repairing or replacing as needed.
- Test the lights: After completing the repair, test the vehicle's lights to ensure the issue has been resolved.
Cost to Fix B2071
The cost of repairing a stop light control relay malfunction can vary depending on the specific cause of the issue and the make and model of the vehicle. Typically, the cost of a new relay can range from $20 to $50, while labor costs for the repair can vary from $50 to $150, depending on the shop's hourly rates. Overall, the total cost of repairing a B2071 code is estimated to be between $70 and $200. It is recommended to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on your vehicle's specific needs.
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Code B2071 Information for Specific Makes
- B2071 Ford — Hazard Switch Signal Short To Ground
- B2071 Lexus — Stop Light Control Relay Malfunction
- B2071 Lincoln — Hazard Switch Signal Short To Ground
- B2071 Mercury — Hazard Switch Signal Short To Ground
- B2071 Scion — Stop Light Control Relay Malfunction
- B2071 Toyota — Stop Light Control Relay Malfunction
Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service
- Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
- Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
- Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
- Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.
Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.
Frequently Asked Questions about B2071 Code
1. What does the OBDII code B2071 mean?
B2071 indicates a malfunction in the stop light control relay, which is responsible for controlling the brake lights when the brake pedal is pressed.
2. What are the common symptoms of the B2071 code?
Symptoms may include non-functional brake lights, brake lights staying on constantly, or a warning light on the dashboard.
3. What causes the B2071 code to appear?
Common causes include a faulty stop light control relay, damaged wiring or connectors, or issues with the brake light switch.
4. Can a faulty brake light switch trigger the B2071 code?
Yes, a malfunctioning brake light switch can cause the stop light control relay to operate improperly, triggering the code.
5. How can I diagnose the B2071 code?
Diagnose by inspecting the stop light control relay, brake light switch, and related wiring for damage, corrosion, or loose connections. Testing the relay's functionality with a multimeter can also help.
6. Can I drive with the B2071 code present?
It’s not recommended since malfunctioning brake lights can create safety risks for you and other drivers.
7. How do I fix the B2071 code?
Repairs typically involve replacing the faulty stop light control relay, repairing damaged wiring, or replacing the brake light switch if necessary.
8. How much does it cost to fix the B2071 code?
The repair cost varies but typically ranges from $50 to $150 for parts and labor, depending on the vehicle and the specific issue.
9. Can a blown fuse cause the B2071 code?
Yes, a blown fuse in the brake light circuit can disrupt the stop light relay’s function and trigger the code.
10. How can I prevent the B2071 code from recurring?
Regularly inspect and maintain the brake light system, including the relay, wiring, and brake light switch, to prevent wear and corrosion.
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