P0652 Sensor Reference Voltage B Circuit Low 2

Definition: The P0652 code indicates that there is a problem with the sensor reference voltage “B” circuit, which is reading lower than expected. This can affect various sensors and components that rely on this reference voltage for proper operation.

p0652 – Sensor Reference Voltage B Circuit Low

Severity: Moderate

Common Causes

P0652 – Sensor Reference Voltage B Circuit Low

Common causes:

• Faulty sensor
• Short circuit or open circuit in the wiring harness
• Corrosion or poor connections in the sensor connector
• Defective Engine Control Module (ECM)

 

Common Misdiagnosis

OBD2 Code: P0652

Description: Sensor Reference Voltage B Circuit Low

Common Misdiagnosis: Replacing the sensor without checking for wiring issues or a faulty powertrain control module (PCM).

 

Common Diagnostic Steps

OBD2 Code: P0652

Description: Sensor Reference Voltage B Circuit Low

Common Diagnostic Steps:

• Verify the code with an OBD-II scanner. Record freeze frame data for further diagnosis.
• Inspect the wiring and connectors related to the sensor reference voltage B circuit for damage, corrosion, or disconnection.
• Check the voltage at the sensor connector using a multimeter to ensure it is within specifications (typically around 5 volts).
• If voltage is low or absent, trace back through the harness to find any breaks or shorts in the wires.
• Test the powertrain control module (PCM) output for proper voltage supply to ensure it’s not faulty.
• If all wiring and connections are intact, consider testing or replacing sensors connected to this circuit that may be causing a short.
• Clear codes and test drive to see if the code returns after repairs are made.