Partially blocked or restricted fuel injector (deposits, dirt or wear); Clogged fuel filter or restricted fuel supply line; Weak low-pressure or high-pressure fuel pump, or a fault in the fuel pressure regulation; Injector wiring, connector or driver circuit fault causing reduced injector operation; Contaminated, poor-quality or incorrect fuel; Air leak or fuel pressure sensor fault giving the control unit false readings; Internal control unit fault or outdated calibration, where the manufacturer lists it as a known cause for this engine.

P00BB

Fuel Injector Insufficient Flow - Forced Limited Power.

Generic
Powertrain
Generic code
High severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
0: AreaFuel and air metering, auxiliary emission controls
BB: FaultThe specific fault in that area

What it means

P00BB indicates the engine control unit has judged that a fuel injector is not delivering enough fuel for what it commanded, and has put the engine into a forced limited power mode to protect it. It is usually set when measured fuel delivery, rail pressure, fuel trims or combustion feedback show the cylinder is getting less fuel than requested. How the unit detects this depends on the engine and fuel system, so check the manufacturer's data for the specific vehicle.

Symptoms

Reduced power or limp mode with the engine warning light on
Hesitation or poor acceleration under load
Rough idle or misfire on one or more cylinders
Hard starting or extended cranking
Higher than normal fuel trim corrections or a lean running condition
Possible fuel smell or smoke if an injector is faulty, depending on the fuel system

Possible causes

Partially blocked or restricted fuel injector (deposits, dirt or wear)likely
Clogged fuel filter or restricted fuel supply linelikely
Weak low-pressure or high-pressure fuel pump, or a fault in the fuel pressure regulationlikely
Injector wiring, connector or driver circuit fault causing reduced injector operationpossible
Contaminated, poor-quality or incorrect fuelpossible
Air leak or fuel pressure sensor fault giving the control unit false readingsrare
Internal control unit fault or outdated calibration, where the manufacturer lists it as a known cause for this enginerare

How to diagnose

Read all stored and pending codes and the freeze frame data, noting load, rpm, fuel pressure and fuel trims when the fault set
Check for other fuel, misfire, rail pressure or injector codes, as these point to the root cause
Check the fuel level and the fuel quality, and ask about recent refuelling or a missed filter service
Inspect the injector wiring, connectors and earth connections for damage, corrosion, chafing or heat damage
Watch live fuel trims, fuel pressure and misfire counters to see whether one cylinder or the whole engine is affected
Test fuel pressure and volume against the manufacturer's specification for that engine
Test the injector circuit and the injector's electrical values, and carry out any injector balance or flow test the manufacturer specifies
Check the intake system for air leaks and confirm that the pressure sensor readings are plausible

How to fix

Replace or professionally clean and flow-test a restricted or faulty injector, following the manufacturer's procedure
Replace the fuel filter and clear any restriction in the supply line
Repair or replace a weak fuel pump or faulty pressure regulation component
Repair damaged injector wiring or connectors, or restore a poor earth
Drain and replace contaminated fuel, then replace the filter if it has been affected
Apply a manufacturer calibration update only if it is a documented fix for this fault, then clear the code and road test

Can I keep driving?

High severity

Limit driving, as the car is in limited power mode and running short of fuel can cause misfire and engine or catalyst damage. Only drive it to a safe place or a workshop, gently and over a short distance.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.