A sensor on the shared supply C circuit has failed internally and is pulling the voltage down; Reference supply wiring chafed or shorted to ground or to another circuit; Damaged, corroded or water-affected connector terminals on the sensor or control unit; Low or unstable battery or charging voltage upsetting the control unit supply regulation; Poor or corroded control unit earth connections; Internal fault in the control unit supply driver.

P06E7

Sensor Power Supply C Circuit Low.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
6: AreaComputer and output circuits
E7: FaultThe specific fault in that area

What it means

P06E7 means the engine or powertrain control module has detected that the voltage on sensor power supply circuit C (one of the regulated reference supplies, commonly 5 volts, that feed various sensors) is lower than expected. Which sensors share supply C depends on the vehicle and the control unit, so the affected sensors vary by model. A short to ground, a shorted sensor or a fault inside the control unit can pull the supply down.

Symptoms

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

Possible causes

A sensor on the shared supply C circuit has failed internally and is pulling the voltage downlikely
Reference supply wiring chafed or shorted to ground or to another circuitlikely
Damaged, corroded or water-affected connector terminals on the sensor or control unitpossible
Low or unstable battery or charging voltage upsetting the control unit supply regulationpossible
Poor or corroded control unit earth connectionspossible
Internal fault in the control unit supply driverrare

How to diagnose

Read all stored and pending codes and note freeze frame data, paying attention to other sensor circuit faults that may share the same supply
Check the wiring diagram for the vehicle to find which sensors are fed by sensor supply C, as this varies by make and model
Check battery condition and charging voltage, and confirm main and control unit earth connections are clean and tight
Inspect the wiring and connectors of the sensors on supply C for chafing, water ingress, bent or pushed-back pins and corrosion
With the ignition on, measure the voltage at the supply C circuit and compare it with the specification for the vehicle
Unplug the sensors on the circuit one at a time and watch whether the supply voltage recovers, which identifies a shorted sensor
Check the supply wire for a short to ground with the control unit and sensors disconnected, following the wiring diagram
Clear the code, road test and recheck, and only consider the control unit once wiring and sensors have been ruled out

How to fix

Replace the sensor that is pulling the supply voltage down
Repair or replace damaged wiring and fix any short to ground
Clean or replace corroded or damaged connectors and terminals
Restore good battery condition and repair charging or earth faults
Repair or replace the control unit only after confirming it is faulty, and follow the manufacturer's procedure for any required programming

Can I keep driving?

Medium severity

The car may be driveable, but loss of sensor supply can cause limp mode, poor running or stalling, so have it checked soon. Avoid driving if it stalls or loses power, as that could be unsafe in traffic.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.