OBD Guide
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B1990

Pedal Forward / Rearward Potentiometer Feedback Circuit Failure

B1990 is an OBD-II diagnostic trouble code meaning: Pedal Forward / Rearward Potentiometer Feedback Circuit Failure. Common causes: open or short circuit in the potentiometer circuit, poor contact in the sensor connector. Estimated repair cost: $56–167.

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

Symptoms

  • Unstable engine operation at idle
  • Delayed response to pressing the gas pedal
  • Turning on the Check Engine Light
  • Reduced engine power

Causes

  • Open or short circuit in the potentiometer circuit
  • Poor contact in the sensor connector
  • Failure of the gas pedal potentiometer
  • Wiring harness damage
  • Contact corrosion

How to Fix

  1. Check the integrity of the gas pedal potentiometer circuit
  2. Inspect connectors and contacts for damage or corrosion
  3. Replace the accelerator pedal potentiometer if necessary
  4. Check and replace wiring harness if necessary

Related codes

P0120P0121P0122P0123

FAQ

What does the B1990 code mean?

B1990 is an OBD-II diagnostic trouble code that indicates: Pedal Forward / Rearward Potentiometer Feedback Circuit Failure

What causes a B1990 error code?

The most common causes of B1990 include: Open or short circuit in the potentiometer circuit; Poor contact in the sensor connector; Failure of the gas pedal potentiometer; Wiring harness damage.

How do I fix a B1990 diagnostic trouble code?

To fix B1990: Check the integrity of the gas pedal potentiometer circuit. Inspect connectors and contacts for damage or corrosion. Replace the accelerator pedal potentiometer if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1990?

Limited driving only, diagnose soon

How much does it cost to fix B1990?

The estimated repair cost for B1990 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat