B1276 – Servo Motor Potentiometer Foot Circuit Failure

The ODBII code B1276 indicates a failure in the servo motor potentiometer circuit related to the foot control, typically associated with issues in the throttle or brake system.

The severity of ODBII code B1276 is generally considered moderate to severe.

Common Causes For: B1275 Servo Motor Potentiometer Vent Circuit Short To Ground

• Faulty servo motor potentiometer
• Wiring issues (shorts, opens, or corrosion)
• Poor electrical connections
• Malfunctioning accelerator pedal position sensor
• Software or calibration issues in the control module
• Mechanical binding or obstruction in the pedal assembly
• Faulty control module or ECM (Engine Control Module)

Common misdiagnosis for B1276 Servo Motor Potentiometer Foot Circuit Failure

• Throttle position sensor failure
• Accelerator pedal position sensor failure
• Wiring or connector issues
• Electronic control unit (ECU) malfunction
• Brake pedal position sensor failure
• Faulty servo motor
• Calibration issues
• Software glitches in the vehicle’s control system

Common Troubleshooting Steps

The OBD-II code B1276 indicates a “Servo Motor Potentiometer Foot Circuit Failure.” This code is typically associated with issues in the accelerator pedal position sensor or the related circuitry. Here are some common troubleshooting steps to diagnose and resolve this issue:

• Check for Additional Codes: Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context and help identify related issues.
• Inspect Wiring and Connectors:
• Visually inspect the wiring and connectors associated with the accelerator pedal position sensor and the servo motor.
• Look for signs of damage, corrosion, loose connections, or frayed wires.
• Test the Accelerator Pedal Position Sensor:
• Use a multimeter to test the resistance of the potentiometer in the accelerator pedal position sensor.
• Compare the readings to the specifications provided in the vehicle’s service manual. If the readings are outside the specified range, the sensor may need to be replaced.
• Check for Ground Issues:
• Ensure that the ground connections for the accelerator pedal position sensor and the servo motor are secure and free of corrosion.
• Test the ground circuit with a multimeter to ensure proper continuity.
• Inspect the Servo Motor:
• If applicable, check the servo motor for proper operation. This may involve testing the motor directly or checking for any mechanical binding or obstruction.
• Check for Voltage Supply:
• Verify that the accelerator pedal position sensor is receiving the correct voltage supply from the vehicle’s electrical system.
• Use a multimeter to measure the voltage at the sensor connector while the ignition is on (but the engine is off).
• Look for Software Updates:
• Check if there are any software updates or recalls related to the vehicle’s engine control module (ECM) that may address this issue.
• Clear Codes and Test Drive:
• After performing any repairs or adjustments, clear the trouble codes using the OBD-II scanner.
• Take the vehicle for a test drive to see if the code reappears.
• Consult Technical Service Bulletins (TSBs):
• Look for any TSBs related to the B1276 code for your specific vehicle make and model. Manufacturers may have specific recommendations or known issues.
• Seek Professional Help:
• If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with your vehicle’s make and model. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1276 code.