P00CF: Barometric Pressure - Turbocharger/Supercharger Boost Sensor A Correlation

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.

Symptoms

• Check engine light on
• Reduced boost or limp mode possible
• Often no further symptoms

Most 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

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the connector and the pressure port
2. Compare both signals at the same time in live data and check any recent installation work.
3. With the engine off, compare the reading with the atmospheric pressure from the barometric sensor
4. Watch how it changes when starting and accelerating
5. Clean it with a suitable product, or replace it if it does not respond

Good to know

• Repair difficulty: easy
• It can trigger limp mode.
• It affects emissions.

What each character of P00CF means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• 0: Subsystem depends on the code range
• CF: Specific fault in that system

Frequently asked questions

Can I keep driving with code P00CF?

You can drive with caution to a repair shop. Avoid demanding power if the car is in limp mode.

What causes code P00CF?

The most common causes are: 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.

Related codes

• P00D0Barometric Pressure - Turbocharger/Supercharger Boost Sensor B Correlation
• P00C7Intake Air Pressure Measurement System - Multiple Sensor Correlation Bank 1
• P2227Barometric Pressure Sensor A Circuit Range/Performance
• P0236Turbocharger/Supercharger Boost Sensor A Circuit Range/Performance
• P0069Manifold Absolute Pressure - Barometric Pressure Correlation

Sources

• law.cornell.edu: 13 CCR 1968.2
• fordservicecontent.com: OBD Operations Summary Gasoline 2020 2023
• gsi.ext.gm.com: 18OBDG03A Engine Diagnostics

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.