Powertrain, generic · Fuel and air metering, auxiliary emission controls
P00C7 Intake Air Pressure Measurement System - Multiple Sensor Correlation Bank 1
Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible
With the engine stopped, all pressure sensors in the intake system (manifold pressure, boost pressure, barometric pressure) should read ambient pressure; some diesels also compare them at idle. The control module compares them: if one sensor stands out, it sets that sensor's own code. P00C7 is set when the readings disagree but no single sensor can be identified as faulty, which points to a fault affecting several sensors, such as a shared reference voltage or ground.
Likely causes
Shared 5 V reference or ground of the pressure sensors disturbed
Two sensors drifting at the same time (contamination, oil mist, ageing)
Pressure hose to a sensor leaking or blocked
Engine control module or software
Symptoms
- Check engine light on
- Often no further symptoms
- Substitute values with loss of power possible
Repair estimate
DifficultyMediumDIY possible
Parts and labour€50–300
Time0.5–2 h
Typical range across vehicles; the real cost depends on what the testing finds.
Parts involved
manifold absolute pressure sensorboost pressure sensorbarometric pressure sensorsensor reference voltage
Related codes
References: law.cornell.edu, gsi.ext.gm.com, gsi.ext.gm.com.