B1264 – Servo Motor Foot Circuit Failure

The ODBII code B1264 indicates a malfunction in the servo motor foot circuit, which is responsible for controlling the footwell air distribution in the vehicle’s climate control system.

The severity of ODBII code B1264 Servo Motor Foot Circuit Failure is moderate.

Common Causes For: B1263 Servo Motor Vent Circuit Failure

• Faulty servo motor
• Damaged wiring or connectors
• Short circuit in the foot circuit
• Open circuit in the foot circuit
• Failed control module
• Corroded terminals
• Poor ground connection
• Malfunctioning foot switch

Common misdiagnosis for B1264 Servo Motor Foot Circuit Failure

• Faulty brake pedal switch
• Wiring issues or shorts in the circuit
• Malfunctioning accelerator pedal position sensor
• Defective throttle body or actuator
• Issues with the engine control module (ECM)
• Problems with the body control module (BCM)
• Low battery voltage or electrical system issues
• Faulty servo motor or actuator itself

Common Troubleshooting Steps

The OBD-II code B1264 indicates a “Servo Motor Foot Circuit Failure,” which is typically related to the vehicle’s HVAC (Heating, Ventilation, and Air Conditioning) system. This code can be triggered by various issues, including electrical problems, component failures, or communication errors. Here are some common troubleshooting steps to diagnose and resolve the issue:

• Check for Additional Codes: Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are multiple issues.
• Inspect the Wiring and Connectors: Visually inspect the wiring harness and connectors associated with the servo motor and HVAC system. Look for signs of damage, corrosion, or loose connections.
• Ensure that all connectors are securely attached and free of dirt or moisture.
• Test the Servo Motor: If accessible, test the servo motor for proper operation. You can do this by applying power directly to the motor to see if it responds.
• If the motor does not operate when powered directly, it may need to be replaced.
• Check the HVAC Control Module: The HVAC control module may be malfunctioning. Check for proper operation and communication with the servo motor.
• If possible, perform a reset or reprogramming of the module to see if that resolves the issue.
• Inspect Fuses and Relays: Check the fuses and relays associated with the HVAC system and servo motor. Replace any blown fuses or faulty relays.
• Test the Power and Ground Circuits: Use a multimeter to check for proper voltage and ground at the servo motor connector. Ensure that the motor is receiving the correct voltage when commanded by the control module.
• Check for Mechanical Obstructions: Inspect the HVAC system for any mechanical obstructions that may prevent the servo motor from moving freely. This could include debris or broken components within the HVAC housing.
• Perform a Calibration: Some vehicles require a calibration procedure for the HVAC system after repairs. Consult the vehicle’s service manual for specific calibration steps.
• Consult Technical Service Bulletins (TSBs): Check for any TSBs related to the B1264 code for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes.
• Seek Professional Help: If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has experience with your vehicle’s HVAC system. By following these troubleshooting steps, you should be able to identify and resolve the cause of the B1264 code. Always refer to the vehicle’s service manual for specific procedures and specifications.