Faulty barometric pressure (BARO) sensor or its wiring/connector.; Faulty turbocharger/supercharger boost sensor A or its wiring/connector.; Leaks or restrictions in the boost pressure sensing circuit, such as a cracked hose or clogged port.; Corrosion or damage to the sensor reference voltage or ground circuits.; PCM software calibration issue or internal PCM fault (less common).; Aftermarket performance tuner or modifications affecting sensor readings.; Extreme altitude changes without sensor recalibration (rare).

DTC codes / P00xx · Fuel and air metering and auxiliary emission controls / P00CF

P00CFBarometric Pressure - Turbocharger/Supercharger Boost Sensor A Correlation

P00CF indicates that the powertrain control module (PCM) has detected a correlation error between the barometric pressure (BARO) sensor and the turbocharger/supercharger boost sensor A. The PCM compares the BARO reading, typically taken at key-on or during certain operating conditions, with the boost sensor reading when the engine is not under boost, and if the two pressures deviate beyond a calibrated threshold, it sets this code.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering and auxiliary emission controls

Symptoms you may notice

Malfunction indicator lamp (MIL) illuminated on the dashboard, often with no other noticeable symptoms.
Reduced engine performance or power, especially during acceleration or under load.
Poor fuel economy or unusual shifting patterns as the PCM may alter boost control strategies.
Intermittent hesitation or stumble when accelerating from a stop.
In some cases, the engine may enter limp mode or limit boost to protect the turbocharger.

Common causes, most likely first

Faulty barometric pressure (BARO) sensor or its wiring/connector.
Faulty turbocharger/supercharger boost sensor A or its wiring/connector.
Leaks or restrictions in the boost pressure sensing circuit, such as a cracked hose or clogged port.
Corrosion or damage to the sensor reference voltage or ground circuits.
PCM software calibration issue or internal PCM fault (less common).
Aftermarket performance tuner or modifications affecting sensor readings.
Extreme altitude changes without sensor recalibration (rare).

How to diagnose and fix it

Perform a visual inspection of the BARO and boost sensor connectors and wiring for damage, corrosion, or loose pins.
Check for technical service bulletins (TSBs) or software updates for the vehicle make and model related to this code.
Use a scan tool to compare live BARO and boost sensor readings at key-on, engine off (KOEO) and during idle; they should be close to each other and to actual atmospheric pressure.
Test the BARO sensor signal and reference voltage with a multimeter, following the manufacturer's diagnostic procedure.
Test the boost sensor A signal and reference voltage similarly, and inspect the pressure sensing hose for leaks or blockages.
If sensor readings are erratic or out of specification, replace the faulty sensor and clear the code.
If all sensors and circuits test good, reprogram or replace the PCM as a last resort, ensuring proper calibration.

Key checks before replacing sensors

A dirty or clogged boost sensor port can cause a correlation error without any sensor electrical fault, so always inspect the pressure port and hose.
The BARO sensor is sometimes integrated into the mass airflow (MAF) sensor or the PCM; misdiagnosis occurs when technicians replace the wrong component.
This code can be set by a weak battery or charging system issue that causes low reference voltage, so check battery health first.
Aftermarket air intake or boost modifications can alter sensor readings and trigger P00CF even when all components are functioning normally.
In some vehicles, the boost sensor A is used for both boost and barometric pressure at different times; a faulty sensor may still read correctly at key-on but fail under boost.

Can I keep driving with P00CF?

The vehicle is generally safe to drive with P00CF, but avoid aggressive acceleration or heavy load until diagnosed, as incorrect boost control may lead to reduced performance or, in rare cases, turbocharger damage. If the engine enters limp mode, seek service promptly.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.