P06E6

What it means

P06E6 is a generic code meaning the powertrain control module has detected an open circuit on sensor power supply circuit C, one of the regulated reference voltage outputs (often 5 volts) that feed engine and transmission sensors. The module saw the reference voltage missing or out of range compared with what it expects, so the sensors on that supply cannot work properly. Which sensors share supply C depends on the make, model and engine.

Symptoms

• Engine warning light on
• Reduced power or limp mode
• Poor or erratic throttle response
• Rough running, hesitation or stalling
• Hard starting or no start
• Other sensor fault codes stored at the same time

Possible causes

• Damaged wiring, chafed or broken, in the sensor reference supply circuitlikely
• Corroded, loose or pushed-out pins at a connector on the shared supply circuitlikely
• A failed sensor on the shared supply pulling the circuit down or opening it internallypossible
• Poor power or earth supply to the control modulepossible
• Water ingress or previous repair damage to the harnesspossible
• Internal fault in the powertrain control module supply outputrare

How to diagnose

1. Read all stored codes and freeze frame data, noting any other sensor circuit codes that share the same supply
2. Check the manufacturer wiring diagram to identify which sensors are fed by supply C on this model and engine
3. Inspect the related harness and connectors for chafing, corrosion, water, bent or backed-out pins and signs of previous repair
4. Check the battery condition and the control module power and earth connections
5. With the ignition on, measure the reference voltage at the affected sensor connectors against the specified value
6. Unplug the sensors on the circuit one at a time and see whether the reference voltage returns to normal
7. Test the supply wire for continuity and for shorts to earth or voltage between the module and the sensors
8. If wiring and sensors are all good, confirm the module supply output fault before considering module repair or replacement

How to fix

• Repair or replace damaged wiring in the supply circuit
• Clean, repair or replace corroded or damaged connectors and terminals
• Replace any sensor found to be causing the supply fault
• Restore a good power or earth connection to the control module
• Repair or replace the control module only after all other causes are ruled out, following the manufacturer's procedure
• Clear the codes after repair and road test to confirm they do not return

Can I keep driving?

Nearby codes

• P06E5GenericGlow Plug Control Module 1 Performance
• P06E7GenericSensor Power Supply C Circuit Low