Cylinder 4 Pressure Sensor Circuit High

Where it lives

For P03B6, the sensor sits on the circuit this code reports. The description of P03B6 puts it on cylinder 4.

Check these first

• A short to power on the cylinder 4 pressure signal wire
• A failed cylinder 4 pressure sensor
• A broken sensor 4 ground
• A chafed harness shorting sensor 4 to another circuit
• A faulty ECM input for the cylinder 4 sensor

What to do next

1. Check the cylinder 4 signal wire for voltage with the sensor unplugged
2. Test the sensor 4 ground for an open
3. Inspect the harness for a rub against a live wire
4. Compare the cylinder 4 signal to a good cylinder
5. Replace the cylinder 4 pressure sensor if the wiring tests good
6. Clear the code and retest

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