OBD Guide
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B1991

Pedal Forward / Rearward Potentiometer Feedback Circuit Short to Battery

B1991 is an OBD-II diagnostic trouble code meaning: Pedal Forward / Rearward Potentiometer Feedback Circuit Short to Battery. Common causes: wiring harness damage, gas pedal potentiometer malfunction. Estimated repair cost: $56–167.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Loss of engine power
  • Fixed idle speed
  • Check Engine light comes on
  • Inadequate response to pressing the gas pedal

Causes

  • Wiring harness damage
  • Gas pedal potentiometer malfunction
  • Short circuit in power supply
  • ECU problems

How to Fix

  1. Check the integrity of the wiring harness
  2. Measure the resistance of the accelerator pedal potentiometer
  3. Check the signals from the potentiometer using an oscilloscope
  4. Replace faulty components
  5. Clear error memory and check system operation

Related codes

B1990B1992P0120P0122

FAQ

What does the B1991 code mean?

B1991 is an OBD-II diagnostic trouble code that indicates: Pedal Forward / Rearward Potentiometer Feedback Circuit Short to Battery

What causes a B1991 error code?

The most common causes of B1991 include: Wiring harness damage; Gas pedal potentiometer malfunction; Short circuit in power supply; ECU problems.

How do I fix a B1991 diagnostic trouble code?

To fix B1991: Check the integrity of the wiring harness. Measure the resistance of the accelerator pedal potentiometer. Check the signals from the potentiometer using an oscilloscope. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1991?

Limited driving only, diagnose soon

How much does it cost to fix B1991?

The estimated repair cost for B1991 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat