AutoCodes – Mercury – B2971 Mercury

B2971 Mercury Code - Pedal Position Input Short To Ground

Quick Answer

The adjustable pedal memory function utilizes a Hall-effect position sensor. Common causes include Adjustable Pedal Motor harness is open or shorted, Adjustable Pedal Motor circuit poor electrical connection, Faulty Memory Set Switch. 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: B2971 Mercury indicates Pedal Position Input Short To Ground.
Common causes: Common causes include Adjustable Pedal Motor harness is open or shorted, Adjustable Pedal Motor circuit poor electrical connection, Faulty Memory Set Switch.
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 399

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 24, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2971 Mercury Description

The adjustable pedal memory function utilizes a Hall-effect position sensor. The Driver Seat Module (DSM) supplies a signal feed circuit to the position sensor and a reference signal return circuit. Each position sensor sends a signal voltage back to the DSM used to monitor the position of the adjustable pedals. The signal voltage from the adjustable pedal Hall-effect sensor to the DSM provides an indication to the DSM of whether or not the adjustable pedal motor is stalled. When the driver sets a pedal position in the DSM, it stores the value of where the adjustable pedals are located using a time frame of motor operation. When the driver requests a return to a pedal position in memory, the DSM operates the adjustable pedal motor until the adjustable pedals output matches the time frame stored in memory. If the memory function is not utilized, the adjustable pedal switch can also be used for normal operation of the adjustable pedals system. The DSM receives a voltage reference from the adjustable pedals switch. The DSM interprets this and then operates the adjustable pedals in the commanded direction.

OBDII Code B2971 Mercury - Pedal Position Input Short To Ground - AutoCodes.com — B2971 Mercury Code - Pedal Position Input Short To Ground

What does this mean?

What are the Possible Causes of the DTC B2971 Mercury?

Adjustable Pedal Motor harness is open or shorted
Adjustable Pedal Motor circuit poor electrical connection
Faulty Memory Set Switch
Faulty Adjustable Pedal Switch
Faulty Adjustable Pedal Motor
Faulty Driver seat module (DSM)

How to Fix the DTC B2971 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 B2971 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 B2971 Mercury Code

1. What does the OBDII code B2971 mean on a Mercury vehicle?

B2971 indicates a "Pedal Position Input Short To Ground," meaning the pedal position sensor circuit has a short to ground, causing issues with sensor functionality.

2. What are the common symptoms of code B2971 in a Mercury?

Symptoms may include poor throttle response, reduced engine power, illumination of the check engine light, and potential limp mode activation.

3. What causes the B2971 code in a Mercury?

Common causes include damaged wiring, corroded connectors, a faulty pedal position sensor, or a short to ground within the circuit.

4. Can I drive my Mercury with the B2971 code present?

Driving with this code is not recommended, as it can result in reduced throttle control and potential safety risks, especially if the vehicle enters limp mode.

5. How do I diagnose the B2971 code on my Mercury?

Start by inspecting the pedal position sensor wiring and connectors for damage or corrosion. Use a multimeter to check for continuity and shorts to ground in the circuit.

6. How is the B2971 code typically repaired?

Repairs may include fixing or replacing damaged wiring, cleaning or replacing corroded connectors, or replacing a faulty pedal position sensor.

7. What tools are needed to fix the B2971 code?

Youâ€™ll need an OBDII scanner, a multimeter for electrical testing, and basic tools for accessing and repairing wiring or the pedal position sensor.

8. How can I prevent the B2971 code from occurring again?

Perform regular inspections of the wiring and connectors in the pedal position sensor circuit to catch potential issues early.

9. Will clearing the B2971 code with a scanner fix the problem?

Clearing the code will turn off the warning light temporarily, but the issue will return if the underlying cause is not resolved.

10. Is a faulty PCM a common cause of the B2971 code on a Mercury?

While rare, a malfunctioning PCM (Powertrain Control Module) can cause this code, but it should only be considered after ruling out all other potential causes.