P0652

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

1. Check circuit B sensor reference voltage (should be 4.9 - 5.1 V)
2. Inspect and clean all circuit B sensor connectors
3. Disable sensors one at a time to identify the source of the drawdown
4. Check the resistance of the reference wire
5. Inspect the ECU connector for oxidation.
6. Replace the faulty sensor or repair the wiring

Related codes

Error P0652 by Vehicle Brand