What does code P0652 mean?

Q: What does code P0652 mean?

Sensor Reference Voltage 'B' Circuit Low. P0652 indicates that the powertrain control module (PCM) has detected an abnormally low voltage on the 'B' sensor reference circuit, which is a 5-volt supply shared by multiple sensors. The PCM monitors this reference line and sets the code when the voltage drops below a calibrated threshold, typically because of a short to ground or an excessive load on the circuit.

DTC codes / P06xx · Computer and output circuits / P0652

P0652Sensor Reference Voltage 'B' Circuit Low

P0652 indicates that the powertrain control module (PCM) has detected an abnormally low voltage on the 'B' sensor reference circuit, which is a 5-volt supply shared by multiple sensors. The PCM monitors this reference line and sets the code when the voltage drops below a calibrated threshold, typically because of a short to ground or an excessive load on the circuit.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaComputer and output circuits

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.