What it means
The EVAP pressure sensor/switch C reports a circuit high condition. Tank pressure plausibility for leak detection on this branch is impaired.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
EVAP pressure sensor/switch C measures pressure in the evaporative-emissions system for leak detection. This code sets when its circuit signal is higher than the module expects, so the module cannot rely on that branch's pressure reading.
Common causes
Most likely first.
- Signal wire shorted to B+
- Open pressure sensor
- Connector pins corroded - high contact resistance
Symptoms
- Check engine light on
- Possible smell of fuel near tank or engine bay
- Failed emissions inspection
- Loose-cap warning may appear
How to diagnose it
- Record freeze-frame data and inspect live EVAP pressure readings for a value that is fixed or unexpectedly high.
- Inspect sensor C's connector and harness for corrosion, a disconnected sensor, or wiring damage that could interrupt the signal.
- Using the wiring diagram, check whether the signal wire is shorted to battery voltage and verify the sensor's reference and ground circuits.
- Measure the signal and supply circuits under the fault conditions, comparing results with the manufacturer's specification.
- If circuit checks pass, test sensor C for an internal open or failed output before suspecting the control module.
Common fixes
- Clean and secure corroded or loose sensor C connector pins.
- Repair a signal wire shorted to battery voltage or an open in the sensor circuit.
- Replace pressure sensor/switch C if it has an internal open or fails its specification checks.
- Repair a verified reference or ground circuit fault.
Can I keep driving?
You can generally drive if the vehicle runs normally, but EVAP leak monitoring may not complete and an emissions inspection may fail. If there is a fuel smell, stop in a safe place and arrange prompt inspection.
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.