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Engine-Codes – Generic – B1990

B1990 Code - Pedal Forward / Rearward Potentiometer Feedback Circuit Failure

Quick Answer

The B1990 diagnostic trouble code (DTC) indicates a failure in the pedal forward/rearward potentiometer feedback circuit. Common causes include Faulty pedal position sensor, Damaged wiring or connectors in the feedback circuit, ECM communication issues. 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
B1990 indicates Pedal Forward / Rearward Potentiometer Feedback Circuit Failure.
Common causes
Common causes include Faulty pedal position sensor, Damaged wiring or connectors in the feedback circuit, ECM communication issues.
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 06, 2024
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Code B1990 Description

The B1990 diagnostic trouble code (DTC) indicates a failure in the pedal forward/rearward potentiometer feedback circuit. This circuit is responsible for monitoring the position of the accelerator pedal in vehicles equipped with electronic throttle control systems. The potentiometer is a sensor that measures the pedal's position and sends this information to the engine control module (ECM) to adjust the throttle accordingly. A failure in this circuit can lead to incorrect throttle responses or even a complete loss of throttle control, affecting the vehicle's performance and drivability.

OBDII Code B1990 - Pedal Forward / Rearward Potentiometer Feedback Circuit Failure
B1990 Code - Pedal Forward / Rearward Potentiometer Feedback Circuit Failure

Common Causes of B1990

  1. Faulty pedal position sensor
  2. Damaged wiring or connectors in the feedback circuit
  3. ECM communication issues
  4. Corrosion or moisture in the sensor connections
  5. Mechanical obstruction affecting the pedal movement

Symptoms of B1990

  1. Unresponsive or erratic throttle response
  2. Engine stalling or hesitation during acceleration
  3. Illumination of the check engine light
  4. Reduced engine power mode activation
  5. Difficulty maintaining a constant speed

How to Fix B1990

  1. Perform a thorough inspection of the pedal position sensor and its wiring for any signs of damage or corrosion.
  2. Test the sensor's resistance and voltage output to determine if it is functioning within specifications.
  3. Replace the faulty sensor or repair the damaged wiring as necessary.
  4. Clear the DTC codes from the ECM memory and perform a test drive to verify the repair.
  5. If the issue persists, further diagnostic tests may be required to identify any underlying problems with the ECM or communication system.

Cost to Fix B1990

The cost of repairing a pedal forward/rearward potentiometer feedback circuit failure can vary depending on the extent of the issue and the specific components that need replacement. On average, the parts for this repair may range from $50 to $200, while the labor costs could be between $100 and $300. Keep in mind that the final cost may also include diagnostic fees and any additional repairs that may be needed. It's recommended to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on your vehicle's make and model.

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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 B1990 Code

1. What are the common symptoms of OBDII code B1990 (Pedal Forward / Rearward Potentiometer Feedback Circuit Failure)?

- Common symptoms include the vehicle's accelerator pedal feeling unresponsive, the vehicle going into limp mode, and the malfunction indicator light (MIL) illuminating on the dashboard.

2. What are the possible causes of OBDII code B1990?

- The code B1990 can be triggered by issues such as a faulty pedal position sensor, damaged wiring or connectors in the pedal assembly, or a malfunction in the electronic control module.

3. How is OBDII code B1990 diagnosed?

- Diagnosis of code B1990 involves using a scan tool to retrieve the code, checking the wiring and connectors related to the pedal position sensor, and performing a thorough inspection of the pedal assembly components.

4. What are the repair options for OBDII code B1990?

- Repair options may include replacing the faulty pedal position sensor, repairing or replacing damaged wiring or connectors, or reprogramming the electronic control module if necessary.

5. Can OBDII code B1990 be fixed at home, or is professional help required?

- Depending on the underlying cause, some DIY enthusiasts may be able to address OBDII code B1990 at home by following repair guides or using specialized tools. However, professional help may be required for complex issues.

6. How urgent is it to address OBDII code B1990?

- It is important to address OBDII code B1990 promptly to avoid potential safety hazards, performance issues, and further damage to the vehicle's components. Ignoring the code could lead to more severe problems.

7. Are there any preventative measures to avoid OBDII code B1990 in the future?

- Regular maintenance, such as checking and cleaning the accelerator pedal assembly, inspecting wiring harnesses for wear and tear, and using high-quality components, can help prevent issues that may trigger code B1990.

8. Can OBDII code B1990 cause permanent damage to the vehicle if left unfixed?

- If left unfixed for an extended period, OBDII code B1990 can potentially cause permanent damage to the vehicle's electronic control systems and affect its overall performance and drivability.

9. How long does it typically take to repair OBDII code B1990?

- The repair time for OBDII code B1990 can vary depending on the specific cause of the issue, the availability of replacement parts, and the expertise of the person performing the repair. It may range from a few hours to a day or more.

10. Is it safe to drive with OBDII code B1990 present in the vehicle?

- It is not recommended to drive the vehicle with OBDII code B1990 present, as it can lead to unpredictable acceleration or braking behavior, potentially compromising safety on the road. It is advisable to address the issue before driving the vehicle again.

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