P06E8

Symptoms

• Check Engine light on
• Inflated sensor readings on the diagnostic scanner
• Error codes for sensors with the “Circuit High” type
• Possible failure of several sensors
• Unstable or incorrect engine operation

Causes

• Internal malfunction of the ECU power stabilizer
• Connecting the C wire to the higher voltage wire
• Damaged insulation in the wiring harness
• Poor quality wiring repair with incorrect connection
• Generator voltage regulator malfunction causing network overvoltage

How to Fix

1. Measure the actual voltage at the power terminal of circuit C
2. Check the voltage of the on-board network (normal 13.8–14.4 V when the engine is running)
3. Inspect the wiring harness for a short between wires on circuit C and adjacent wires.
4. Check ECU grounding
5. If the wiring is in good condition and the on-board network voltage is normal, diagnose the ECU
6. After eliminating the cause, check the serviceability of the sensors in circuit C

Related codes

Error P06E8 by Vehicle Brand