P0652 Fault Code

Sensor Reference Voltage B Circuit Low

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0652 error code relates to a fault in the Sensor Reference Voltage B circuit, indicating that the voltage level is abnormally low. This refers to the circuit that provides power to various sensors in the vehicle's system, which is crucial for accurate readings and optimal performance.

• A properly functioning reference voltage is essential for sensors to operate correctly.
• When the voltage is low, it can prevent the sensors from providing accurate data to the engine control unit (ECU).

What are the symptoms of the P0652 code?

Symptoms of a P0652 code may include:

• Check Engine Light: The check engine light will illuminate on the dashboard.
• Poor engine performance: The vehicle may run rough or misfire due to inaccurate sensor readings.
• Decreased fuel efficiency: A drop in fuel mileage may occur as the engine struggles to adjust without accurate sensor data.
• DTCs related to other sensors: Other codes may appear alongside P0652, indicating multiple sensor issues.

What causes the P0652 code?

Several factors can lead to a P0652 code being triggered:

• Faulty wiring: Damaged or frayed wires in the sensor reference circuit.
• Short circuits: An electrical short that causes the reference voltage to drop.
• Faulty sensors: A malfunctioning sensor that draws too much current, affecting the circuit.
• Problems with the ECU: Issues within the engine control unit can also produce this error.

How to fix P0652?

To resolve a P0652 code, consider the following steps:

• Inspect wiring and connectors: Check for any visible damage or corrosion in the sensor reference voltage circuit. Repair or replace damaged components as necessary.
• Test sensors: Use a multimeter to check the voltage output of the affected sensors and ensure they are functioning correctly.
• Examine the ECU: If the sensors and wiring are in good condition, consider testing the engine control unit for faults and reprogramming or replacing it as needed.
• Clear codes and test drive: After repairs, reset the codes and perform a test drive to ensure the issue is resolved.