What it means
The voltage in sensor power supply C is below the expected range. This may affect components supplied by that circuit; which ones 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 provides a shared supply to vehicle sensors or components, depending on the wiring design. P06E7 sets when the control module detects that this supply voltage is below its expected range, which can happen if the rail is shorted to ground or has a high-resistance connection.
Common causes
Most likely first.
- Supply line shorted to ground
- Connector pins corroded - high contact resistance
- Harness chafing through insulation
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 for other sensor supply codes to see whether several components on supply C are affected together.
- Consult the vehicle wiring diagram to identify the supply C loads, then inspect the rail and connectors for chafing, corrosion, or heat damage.
- Check connector terminals for poor contact and measure supply C at the specified test points using the manufacturer's procedure.
- Isolate the connected branches as directed by service information and test the supply line for a short to ground.
- If wiring and connected loads pass, test the source module or supply driver for a fault.
Common fixes
- Repair chafed insulation or a wire shorting the supply C rail to ground.
- Clean or repair corroded, loose, or high-resistance connector terminals.
- Repair a failed component connection that is pulling down supply C.
- Repair or replace the supply driver or module only if testing confirms it is the source of the low voltage.
Can I keep driving?
If supply C powers engine control sensors, low voltage can cause poor running, reduced power, stalling, or a no-start; limit driving if any of these occur. Multiple warning lights or follow-up faults may appear while the shared supply remains low.
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.