What it means
The sensor power supply C circuit is open, interrupting power to components supplied by that circuit. Which sensors are affected depends on the vehicle.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Sensor power supply C is a shared electrical supply rail for sensors or other components, with the exact loads varying by vehicle. P06E6 sets when the control module detects an open in that rail, interrupting power to the components connected to it and potentially causing several related faults.
Common causes
Most likely first.
- Open in supply rail
- Pin pushed back out of connector body
- Cracked solder joint inside the module or sensor
Symptoms
- Check engine light on
- Possible limp mode or no-start
- Multiple follow-up faults across modules
- Reset/relearn may be needed after repair
How to diagnose it
- Save freeze-frame data and scan all modules for sensor supply or communication codes to identify which components may share supply C.
- Use the vehicle wiring diagram to identify the supply C fuse, connectors, splices, and connected components, then inspect them for damage or loose connections.
- Check connector pins along the supply C rail for terminals pushed back out of their housings.
- Test continuity through the supply C circuit to locate an open, following the manufacturer's wiring and isolation procedure.
- If the harness checks out, test the relevant component or control module for an internal open or cracked solder joint as specified by the manufacturer.
Common fixes
- Reseat a pushed-back pin or loose connector on the supply C rail.
- Repair an open wire, splice, or damaged connector in the supply C circuit.
- Repair a failed connection at a supplied sensor or component.
- Replace a component or module only if testing confirms an internal open.
Can I keep driving?
Driving may be affected if supply C powers sensors needed for engine control, and the vehicle could run poorly, enter reduced-power mode, or fail to start. If it stalls, will not start reliably, or shows serious drivability symptoms, avoid driving until the open circuit is located.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.