Faulty, sticking or worn fuel injector that is opening or closing late or early; Damaged wiring, poor connections or corrosion in the injector circuit or its connectors; Fuel supply problems such as low or unstable fuel pressure, a weak pump, a blocked filter, or air or contamination in the fuel; Crankshaft or camshaft position sensor fault, or a poor signal, causing the timing reference to be misread; Mechanical timing out of correlation, for example a stretched chain, a worn belt or a slipped drive, or on some engines a mis-set injection pump; Outdated or faulty control unit software where the manufacturer has identified it as a cause for this engine; Internal fault in the engine control unit or injector driver.

P026B

Injection Timing Performance.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
2: AreaFuel and air metering (injector circuit)
6B: FaultThe specific fault in that area

What it means

P026B means the engine control unit has found that fuel injection timing is not performing as commanded. The measured or inferred start of injection differs from the target by more than the allowed limit, or the injection event is not happening when expected. How timing is measured, and the exact set conditions, depend on the engine and fuel system, so check the manufacturer's data for the vehicle.

Symptoms

Engine management light on, possibly with a limp-home or reduced power mode
Rough running or an uneven idle
Hard starting or long cranking
Noticeably reduced power or hesitation under load
Louder knocking or rattling, or visible smoke from the exhaust
Higher fuel consumption

Possible causes

Faulty, sticking or worn fuel injector that is opening or closing late or earlylikely
Damaged wiring, poor connections or corrosion in the injector circuit or its connectorslikely
Fuel supply problems such as low or unstable fuel pressure, a weak pump, a blocked filter, or air or contamination in the fuelpossible
Crankshaft or camshaft position sensor fault, or a poor signal, causing the timing reference to be misreadpossible
Mechanical timing out of correlation, for example a stretched chain, a worn belt or a slipped drive, or on some engines a mis-set injection pumppossible
Outdated or faulty control unit software where the manufacturer has identified it as a cause for this enginerare
Internal fault in the engine control unit or injector driverrare

How to diagnose

Read all stored and pending codes and the freeze frame data, noting engine speed, load, temperature and fuel pressure when the code set
Look for related codes for injectors, rail or fuel pressure, and crankshaft or camshaft sensors, and deal with those first
Visually inspect the injector wiring, connectors and earths for damage, chafing, oil ingress and corrosion
Check fuel quality and condition, and the fuel filter, and confirm there is no air in the fuel supply
Compare live data for commanded against actual fuel pressure and injection timing, and view crankshaft and camshaft sensor signals for dropouts
Run injector balance or correction tests as the manufacturer specifies, and compare individual cylinder values
Check mechanical timing against the manufacturer's marks or data, particularly if the engine has a history of chain or belt problems
Check for applicable software updates or technical bulletins for the specific model and engine

How to fix

Replace or properly recondition any injector that fails testing, and carry out any required coding or adaptation afterwards
Repair or replace damaged wiring, terminals and connectors in the injector circuit
Correct fuel supply faults by renewing the filter, repairing the low-pressure side, replacing a failing pump, or draining and replacing contaminated fuel
Replace a faulty crankshaft or camshaft sensor, or repair its wiring
Restore correct mechanical timing by replacing worn drive components and re-timing to specification
Update the control unit software only where the manufacturer lists it as a fix for this fault

Can I keep driving?

Medium severity

Short, gentle journeys may be possible, but poor injection timing can cause rough running, higher emissions and potential engine damage. Get it diagnosed soon, and stop driving if there is severe knocking, heavy smoke or a loss of power.

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