B1991 Mercury Code - Pedal Forward / Rearward Potentiometer Feedback Circuit Short to Battery
Quick Answer
he Driver Seat Module (DSM) uses a Hall-effect switch attached to the pedal motor to identify the current pedal position. Common causes include Faulty Adjustable Pedal Motor, Adjustable Pedal Motor harness is open or shorted, Adjustable Pedal Motor circuit poor electrical connection. 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 Mercury indicates Pedal Forward / Rearward Potentiometer Feedback Circuit Short to Battery.
- Common causes
- Common causes include Faulty Adjustable Pedal Motor, Adjustable Pedal Motor harness is open or shorted, Adjustable Pedal Motor circuit poor electrical connection.
- 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.
Code B1991 Mercury Description
When 1 or more of the following Diagnostic Trouble Code (DTC) is set, the adjustable pedals will enter a jog mode. When the pedals are in jog mode, the memory system recall will not function from either the Remote Keyless Entry (RKE) transmitter or the memory SET switch buttons. When the pedals are actuated using the adjustable pedal switch, the motor will move the pedals for one second in the direction selected regardless of the length of time the button is actually pressed.
If the DSM detects a short to voltage on the circuit during normal operation or an on-demand self test and without any pedal switch input, DTC B1991 will be set.
What are the Possible Causes of the DTC B1991 Mercury?
- Faulty Adjustable Pedal Motor
- Adjustable Pedal Motor harness is open or shorted
- Adjustable Pedal Motor circuit poor electrical connection
How to Fix the DTC B1991 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 B1991 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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Frequently Asked Questions about B1991 Mercury Code
1. What are the common symptoms of OBDII code B1991 in a Mercury related to the Pedal Forward/Rearward Potentiometer Feedback Circuit Short to Battery?
The common symptoms include erratic throttle response, sudden loss of throttle control, and possibly triggering the vehicle into limp mode.
2. What are the possible causes of OBDII code B1991 in a Mercury?
Possible causes include wiring issues, a faulty pedal position sensor, a short circuit to the battery, or a malfunctioning electronic control unit (ECU).
3. How can I diagnose the source of the Pedal Forward/Rearward Potentiometer Feedback Circuit Short to Battery issue in my Mercury?
You can start by conducting a visual inspection of the wiring, connectors, and sensors involved. Using a multimeter to test for continuity and resistance can help pinpoint the faulty component.
4. Can I drive my Mercury with OBDII code B1991 present?
It is not recommended to drive your vehicle with this code present, as it can lead to unsafe driving conditions due to erratic throttle behavior.
5. Are there any temporary fixes for OBDII code B1991 in a Mercury?
Temporary fixes such as clearing the code with an OBDII scanner may temporarily resolve the issue, but it is crucial to address the root cause to prevent further problems.
6. How much does it typically cost to repair OBDII code B1991 in a Mercury at a mechanic?
The cost of repair can vary depending on the exact cause of the issue, but it typically ranges from $100 to $500, including parts and labor.
7. Can I reset OBDII code B1991 in my Mercury without fixing the underlying issue?
While you can reset the code using an OBDII scanner, it is not recommended as the issue will likely resurface, potentially causing further damage.
8. Is OBDII code B1991 a common problem in Mercury vehicles?
While not extremely common, this code can occur in Mercury vehicles, especially in models equipped with electronic throttle control systems.
9. Will OBDII code B1991 cause my Mercury to fail an emissions test?
Yes, having this code present can cause your Mercury to fail an emissions test, as it indicates a potential issue with the throttle control system.
10. How long does it typically take to repair OBDII code B1991 in a Mercury?
The repair time can vary depending on the exact cause and complexity of the issue, but it usually takes a few hours to a full day for a professional mechanic to diagnose and fix the problem.
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