What Does B1276 Mean?
This code indicates the Body Control Module (BCM) has detected a circuit fault in the potentiometer feedback circuit of a servo motor controlling a foot-operated function, typically related to adjustable pedals, brake pedal position, or accelerator pedal position systems. The potentiometer provides position feedback to the control module, and the circuit failure means the module cannot accurately monitor the servo motor's position. This is a manufacturer-specific code, so the exact application varies by vehicle make and model.
Common Causes
45%
Open or short circuit in the potentiometer wiring harness, including damaged wires, corroded connectors, or poor ground connections
30%
Failed potentiometer sensor within the servo motor assembly due to wear, contamination, or internal failure
15%
Defective servo motor assembly with internal electrical failure affecting potentiometer operation
10%
Body Control Module internal circuit failure or software corruption
Diagnostic Steps
1
Step 1: Perform a visual inspection of the servo motor assembly and its wiring harness, checking for obvious damage, pinched wires, corrosion at connectors, moisture intrusion, or loose connections. Pay special attention to areas where harness flexes or passes through bulkheads.
2
Step 2: Using a digital multimeter, backprobe the potentiometer connector at the servo motor and verify the reference voltage (typically 5V) and ground circuit integrity with ignition on. Check for proper voltage supply from the BCM and continuity to ground.
3
Step 3: Measure the potentiometer signal voltage while manually moving the servo motor through its full range of motion (if accessible). The voltage should sweep smoothly from approximately 0.5V to 4.5V without dropouts, jumps, or erratic behavior.
4
Step 4: Disconnect the servo motor connector and measure resistance across the potentiometer terminals while moving it through its range. Resistance should change smoothly without infinite or zero readings, typically ranging from 1k to 10k ohms depending on manufacturer specifications.
5
Step 5: If all wiring and potentiometer resistance tests pass, perform a voltage drop test on the power and ground circuits under load to identify high resistance connections. If circuits test good, replace the servo motor assembly.
6
Step 6: After repairs, clear codes, perform a relearn procedure if required by manufacturer, cycle the servo motor through its full range multiple times, and road test to verify proper operation and confirm no code return.
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected a circuit fault in the potentiometer feedback circuit of a servo motor controlling a foot-operated function, typically related to adjustable pedals, brake pedal position, or accelerator pedal position systems. The potentiometer provides ...
The most common cause of B1276 (Servo Motor Potentiometer Foot Circuit Failure) is: Open or short circuit in the potentiometer wiring harness, including damaged wires, corroded connectors, or poor ground connections
Typical repair costs for B1276 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle is generally safe to drive, but functionality of adjustable pedals or accurate pedal position sensing may be compromised, which could affect driver comfort and in some cases, engine performance or stability control systems. Repair within a reasonable timeframe to ensure all vehicle systems function as designed.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1276 to identify the root cause.
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Quick Info
Category
Body
System
Body Control System - Pedal Adjustment/Position Sensing
Difficulty
Type
Manufacturer
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