P06B0

What it means

P06B0 is a generic code meaning the powertrain control module has detected an open circuit in sensor power supply A, which is the regulated reference voltage (commonly 5 volts) feeding a group of engine sensors. The module saw the supply voltage fall outside the expected range, or no voltage at all, indicating a break in the supply wiring or an internal fault. Which sensors share supply A depends on the vehicle and engine.

Symptoms

• Engine warning light on
• Poor or erratic running, or reduced power (limp mode)
• Hesitation or poor throttle response
• Rough idle or stalling
• Difficult starting or no start
• Other sensor fault codes stored at the same time

Possible causes

• Open circuit, chafed wiring or poor connection in the shared sensor supply wirelikely
• Corroded, loose or pushed-out terminals at a sensor connector on the shared supplylikely
• Faulty sensor that has failed open internally and disrupts the supply circuitpossible
• Poor module power or ground connection affecting the internal regulatorpossible
• Previous repair damage or water ingress in a harness or connectorpossible
• Internal fault in the powertrain control module's sensor supply outputrare

How to diagnose

1. Read all stored codes and freeze frame data, noting any other sensor circuit codes that point to a shared supply
2. Check the manufacturer wiring diagram to identify which sensors share sensor supply A on this model and engine
3. Visually inspect the related harness and connectors for chafing, corrosion, water, heat damage or loose terminals
4. With the ignition on, measure the reference voltage at each affected sensor connector against the specified value
5. Unplug the sensors on the shared supply one at a time and watch whether the voltage returns to normal
6. Test the supply wire for continuity and for shorts to ground or battery voltage between the module and each sensor
7. Check the module's power feeds and earth connections, including voltage drop under load
8. Clear the code and road test to confirm it does not return, and only suspect the module once wiring and sensors are proven good

How to fix

• Repair or replace the damaged section of wiring on the sensor supply circuit
• Clean, repair or replace corroded or loose connectors and terminals
• Replace any sensor found to be faulty on the shared supply
• Restore poor power or earth connections to the control module
• Replace or repair the control module only after all wiring and sensors are proven good, following the manufacturer's procedure

Can I keep driving?

Nearby codes

• P06AFGenericTorque Management System - Forced Engine Shutdown
• P06B1GenericSensor Power Supply A Circuit Low