P0652
Sensor Reference Voltage B Circuit Low
P0652 is an OBD-II diagnostic trouble code meaning: Sensor Reference Voltage B Circuit Low. Common causes: oxidation of sensor or ecu connectors in circuit b, sensor with internal current leakage, draining the circuit. Estimated repair cost: $11–67.
Symptoms
- Check Engine light comes on
- Several sensor codes with low values
- Unstable idle
- Dips when pressing gas
- Engine emergency mode
Causes
- Oxidation of sensor or ECU connectors in circuit B
- Sensor with internal current leakage, draining the circuit
- High wire resistance (partial break or corrosion)
- Humidity in connectors
- ECU internal circuit malfunction (rare)
How to Fix
- Check circuit B sensor reference voltage (should be 4.9 - 5.1 V)
- Inspect and clean all circuit B sensor connectors
- Disable sensors one at a time to identify the source of the drawdown
- Check the resistance of the reference wire
- Inspect the ECU connector for oxidation.
- Replace the faulty sensor or repair the wiring
Related codes
Error P0652 by Vehicle Brand
FAQ
What does the P0652 code mean?
P0652 is an OBD-II diagnostic trouble code that indicates: Sensor Reference Voltage B Circuit Low
What causes a P0652 error code?
The most common causes of P0652 include: Oxidation of sensor or ECU connectors in circuit B; Sensor with internal current leakage, draining the circuit; High wire resistance (partial break or corrosion); Humidity in connectors.
How do I fix a P0652 diagnostic trouble code?
To fix P0652: Check circuit B sensor reference voltage (should be 4.9 - 5.1 V). Inspect and clean all circuit B sensor connectors. Disable sensors one at a time to identify the source of the drawdown. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0652?
Do not drive — repair immediately
How much does it cost to fix P0652?
The estimated repair cost for P0652 is $11–67. Actual cost depends on your vehicle, location, and labor rates.
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