B1991 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 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 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?
- 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?
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 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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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
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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