AutoCodes – Mercury – B2071 Mercury

B2071 Mercury Code - Hazard Switch Signal Short To Ground

Quick Answer

The Smart Junction Box (SJB) sends a voltage signal to the multifunction switch. Common causes include Faulty Multifunction Switch, Multifunction Switch harness is open or shorted, Multifunction Switch 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: B2071 Mercury indicates Hazard Switch Signal Short To Ground.
Common causes: Common causes include Faulty Multifunction Switch, Multifunction Switch harness is open or shorted, Multifunction Switch 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.

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Code Popularity 545

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 Feb 26, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2071 Mercury Description

The Smart Junction Box (SJB) sends a voltage signal to the multifunction switch. When the hazard flasher lamp switch is engaged, the voltage signal is routed to ground. When the SJB detects a request for the hazard lamps, the SJB sends voltage to the all turn lamps. The hazard flasher lamp switch is a momentary contact switch. The Diagnostic Trouble Code (DTC) sets when the SJB detects a short to ground from the hazard flasher lamp switch input circuit.

OBDII Code B2071 Mercury - Hazard Switch Signal Short To Ground - AutoCodes.com — B2071 Mercury Code - Hazard Switch Signal Short To Ground

What does this mean?

What are the Possible Causes of the DTC B2071 Mercury?

Faulty Multifunction Switch
Multifunction Switch harness is open or shorted
Multifunction Switch circuit poor electrical connection
Faulty Smart Junction Box (SJB)

How to Fix the DTC B2071 Mercury?

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 B2071 Mercury 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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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 B2071 Mercury Code

1. What are the common symptoms of OBDII code B2071 Mercury (Hazard Switch Signal Short To Ground)?

- Common symptoms include the hazard lights staying on or not functioning properly, the turn signals not working, and the hazard switch not responding.

2. What are the possible causes of OBDII code B2071 Mercury?

- Possible causes include a short to ground in the hazard switch circuit, a faulty hazard switch, damaged wiring or connectors in the hazard switch circuit, or a malfunctioning body control module.

3. How can I diagnose the OBDII code B2071 Mercury?

- You can diagnose this code by visually inspecting the hazard switch and its wiring, checking for any visible damage or corrosion. Using a multimeter to test continuity and resistance in the circuit can help identify the issue.

4. What are some repair tips for fixing OBDII code B2071 Mercury?

- Repair tips include replacing the hazard switch if it is faulty, repairing any damaged wiring or connectors in the circuit, and resetting the fault codes after the repair is completed.

5. Can I continue driving with OBDII code B2071 Mercury?

- It is not recommended to continue driving with this code active, as it can affect the proper functioning of your hazard lights and turn signals, compromising your safety on the road.

6. How much does it typically cost to repair OBDII code B2071 Mercury?

- The cost of repair can vary depending on the specific cause of the issue. Replacing a faulty hazard switch may cost around $50 to $100, while addressing wiring or module issues can range from $100 to $300 or more.

7. Is OBDII code B2071 Mercury a common problem in Mercury vehicles?

- While not extremely common, issues with the hazard switch signal short to ground can occur in certain Mercury models, especially in older vehicles with high mileage or wear and tear on the electrical components.

8. Can I reset OBDII code B2071 Mercury on my own?

- Yes, you can reset the code using an OBDII scanner or by disconnecting the car battery for a few minutes. However, it is important to address the underlying issue causing the code before resetting it.

9. Will OBDII code B2071 Mercury cause my car to fail an emissions test?

- This code is not directly related to emissions, so it may not cause your car to fail an emissions test. However, it is still important to address and repair the issue to ensure the proper functioning of your vehicle's hazard lights and turn signals.

10. How long does it take to repair OBDII code B2071 Mercury?

- The repair time can vary depending on the exact cause of the issue and the complexity of accessing and replacing the faulty components. In general, the repair can take anywhere from 1 to 3 hours to complete.