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Engine-Codes – Generic – B1991

B1991 Code - Pedal Forward / Rearward Potentiometer Feedback Circuit Short to Battery

Quick Answer

The B1991 diagnostic trouble code (DTC) indicates a problem with the Pedal Forward/Rearward Potentiometer Feedback Circuit being shorted to the battery. Common causes include Damaged wiring or connectors in the pedal position sensor circuit, Water intrusion or corrosion in the sensor components, Faulty pedal position sensor. 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
B1991 indicates Pedal Forward / Rearward Potentiometer Feedback Circuit Short to Battery.
Common causes
Common causes include Damaged wiring or connectors in the pedal position sensor circuit, Water intrusion or corrosion in the sensor components, Faulty pedal position sensor.
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 Sep 08, 2024
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Code B1991 Description

The B1991 diagnostic trouble code (DTC) indicates a problem with the Pedal Forward/Rearward Potentiometer Feedback Circuit being shorted to the battery. This circuit is responsible for providing feedback to the vehicle's control module regarding the position of the pedal for acceleration and deceleration. When this circuit is shorted to the battery, it can disrupt the communication between the pedal position sensor and the control module, leading to erratic performance and potentially unsafe driving conditions.

OBDII Code B1991 - Pedal Forward / Rearward Potentiometer Feedback Circuit Short to Battery
B1991 Code - Pedal Forward / Rearward Potentiometer Feedback Circuit Short to Battery

Common Causes of B1991

  1. Damaged wiring or connectors in the pedal position sensor circuit
  2. Water intrusion or corrosion in the sensor components
  3. Faulty pedal position sensor
  4. Short circuit in the wiring harness
  5. Defective control module

Symptoms of B1991

  1. Erratic acceleration or deceleration
  2. Lack of power or hesitation when pressing the pedal
  3. Sudden acceleration without input
  4. Vehicle going into limp mode
  5. Check Engine Light illuminated

How to Fix B1991

  1. Perform a thorough inspection of the pedal position sensor circuit and wiring for any damage or corrosion.
  2. Test the pedal position sensor for proper functionality and replace if necessary.
  3. Repair any damaged wiring or connectors in the circuit.
  4. Clear the DTC from the vehicle's memory using a diagnostic scanner.
  5. Test drive the vehicle to ensure the issue has been resolved and that the pedal response is normal.

Cost to Fix B1991

The typical repair costs for resolving a B1991 code can vary depending on the specific vehicle make and model, as well as the extent of the issue. In general, the cost of parts for this repair can range from $50 to $200, while labor costs may range from $100 to $300. Overall, the total repair cost could range from $150 to $500. It's important to note that the specific diagnosis time and labor rates at auto repair shops can vary, so it's advisable to obtain a detailed estimate from a qualified mechanic.

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Code B1991 Information for Specific Makes

  • B1991 Chrysler — Right Power Sliding Door Sensor Supply Circuit Low
  • B1991 Dodge — Right Power Sliding Door Sensor Supply Circuit Low
  • B1991 Ford — Pedal Forward / Rearward Potentiometer Feedback Circuit Short to Battery
  • B1991 Jeep — Right Power Sliding Door Sensor Supply Circuit Low
  • B1991 Lincoln — Pedal Forward / Rearward Potentiometer Feedback Circuit Short to Battery
  • B1991 Mercury — Pedal Forward / Rearward Potentiometer Feedback Circuit Short to Battery
  • B1991 RAM — Right Power Sliding Door Sensor Supply Circuit Low
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 B1991 Code

1. What does the OBDII code B1991 mean?

B1991 indicates a problem with the pedal forward/rearward potentiometer feedback circuit, specifically a short to the battery.

2. What are the common symptoms of the B1991 code?

Symptoms may include unresponsive or erratic pedal adjustment, failure of the pedal adjustment system, and possibly a warning light on the dashboard.

3. What causes the B1991 code to appear?

The most common causes include damaged wiring, a short circuit to the battery, a faulty potentiometer, or a malfunctioning pedal adjustment motor.

4. Is it safe to drive with the B1991 code active?

Yes, the vehicle is generally safe to drive, but the pedal adjustment feature may not work, potentially affecting driver comfort.

5. How do I diagnose the B1991 code?

Start by inspecting the wiring and connectors for damage or corrosion. Then, test the potentiometer and pedal adjustment motor for proper operation.

6. Can a dead battery trigger the B1991 code?

No, a dead battery itself will not trigger this code, but a short circuit in the wiring could potentially drain the battery.

7. What tools are needed to fix the B1991 code?

You’ll need a multimeter to check for shorts and voltage, a scan tool to clear the code, and possibly replacement parts for the potentiometer or wiring.

8. How much does it cost to repair the B1991 code?

Repair costs vary but can range from $50 to $300, depending on whether wiring repairs or component replacements are needed.

9. Can I fix the B1991 code myself?

If you have basic electrical diagnostic skills and the right tools, you may be able to repair damaged wiring or replace the faulty potentiometer yourself.

10. Will clearing the code with a scan tool fix the B1991 issue?

Clearing the code will reset the warning temporarily, but it won’t fix the underlying issue causing the code. Proper diagnosis and repair are necessary.

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