P00FB

What it means

P00FB means the engine control unit has seen the signal from turbocharger outlet pressure sensor A sitting higher than its expected electrical range. This usually points to a short to voltage, an open circuit or ground fault, or a faulty sensor. The sensor's exact position and the strategy it feeds vary by model and engine, so check the manufacturer's data for the vehicle.

Symptoms

• Engine warning light on
• Reduced power or limp mode
• Poor or erratic boost response
• Hesitation or surging under acceleration
• Possible black smoke or poor fuel economy
• Other boost or turbo related codes stored alongside

Possible causes

• Faulty turbocharger outlet pressure sensor reading out of rangelikely
• Damaged, chafed or contaminated wiring or connector at the sensor, such as signal wire shorted to the 5 V reference or battery supplylikely
• Open circuit in the sensor ground wire or a poor ground connection, pushing the signal highpossible
• Oil, moisture or corrosion in the connector or sensor port causing a false high signalpossible
• Blocked or damaged sensor port or pipe, or a genuine overboost condition from the turbo or boost control systempossible
• Fault inside the engine control unit, such as a failed sensor supply or input circuitrare

How to diagnose

1. Read all stored codes and freeze frame data to see engine load, speed and boost at the moment the code set, and note any other sensor supply or boost codes.
2. Check live data with the ignition on and engine off: the outlet pressure reading should be close to ambient pressure, and a reading stuck at maximum suggests a circuit fault.
3. Inspect the sensor, connector and wiring for chafing, heat damage, oil contamination, bent pins and corrosion.
4. Unplug the sensor and check live data: the reading should change to a fixed low or fault value. If it stays high, suspect a wiring or control unit problem.
5. Using the manufacturer's wiring diagram, test the sensor 5 V supply, ground and signal wire for shorts to voltage, shorts to each other and open circuits.
6. Check the sensor port and associated pipework for blockage, cracks or oil build-up, and confirm the sensor is secure.
7. Check that actual boost is within specification, including the boost control actuator and any overboost causes, using the manufacturer's procedure.
8. If the wiring and sensor test fine, check for software updates or known control unit faults for the model before considering the control unit.

How to fix

• Replace the turbocharger outlet pressure sensor if it is faulty or out of range.
• Repair or replace damaged wiring, and clean or renew corroded or oil-contaminated connectors.
• Restore the sensor ground or supply connection where there is an open circuit or high resistance.
• Clear a blocked sensor port or pipe, and replace any cracked or damaged boost pipework.
• Repair any overboost cause found, such as a sticking boost control actuator or turbo fault, following model-specific procedures.
• Repair or replace the control unit, or apply a manufacturer calibration update, only if testing proves a fault there.

Can I keep driving?

Nearby codes

• P00FAGenericTurbocharger Outlet Pressure Sensor A Circuit Low
• P00FCGenericTurbocharger Outlet Pressure Sensor A Intermittent/Erratic