Powertrain, generic · Fuel and air metering, auxiliary emission controls
P00CF Barometric Pressure - Turbocharger/Supercharger Boost Sensor A Correlation
Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible
With the engine stopped or without boost, the boost pressure sensor A (between compressor and throttle) must read practically ambient pressure. This code is set when it deviates from the barometric pressure sensor by more than a threshold; the code does not say which of the two is wrong. Manufacturers that publish their diagnostics run the same comparison under other codes. None of the published manufacturer documents searched uses this code; the explanation follows regulations and comparable manufacturer monitors.
Likely causes
Boost pressure sensor dirty, oil-coated or drifting
Barometric sensor drifting, also when inside the control module
Contact resistance at connector, ground or 5 V reference
Sensor port or hose leaking or blocked
Symptoms
- Check engine light on
- Reduced boost or limp mode possible
- Often no further symptoms
Repair estimate
DifficultyEasyDIY possible
Parts and labour€40–300
Time0.3–1 h
Typical range across vehicles; the real cost depends on what the testing finds.
Parts involved
boost pressure sensor abarometric pressure sensorsensor reference voltage
Related codes
References: law.cornell.edu, fordservicecontent.com, gsi.ext.gm.com.