Faulty or worn cylinder 3 injector with delayed or inconsistent response, or incorrect injector correction data; Wiring or connector fault in the cylinder 3 injector circuit, such as high resistance, chafing or corrosion; Crankshaft or camshaft position sensor signal fault, or a reluctor or trigger wheel problem causing inaccurate timing reference; Fuel pressure problem, such as a weak or erratic high pressure pump, pressure regulator or rail pressure sensor fault; Mechanical timing error, such as a stretched or slipped timing chain or belt or incorrect valve timing; Outdated or faulty engine control unit calibration where a known software fault is documented for the engine; Internal engine control unit driver fault for the cylinder 3 injector.

P01D0

Cylinder 3 Injection Timing Performance - Over Advanced.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
1: AreaFuel and air metering
D0: FaultThe specific fault in that area

What it means

P01D0 means the engine control unit has found that the fuel injection timing for cylinder 3 is further advanced than commanded, so injection is starting too early compared with the target. It is typically set by comparing the commanded start of injection with the measured or calculated actual timing, using crank and cam position signals and injector feedback. The exact way timing is monitored depends on the engine and fuel system, so this is mainly seen on diesel and some direct injection engines.

Symptoms

Engine management warning light on
Harsh or noisy combustion, knocking or diesel clatter
Rough idle or misfire on cylinder 3
Hard starting or extended cranking
Loss of power or engine running in limp mode
Increased smoke or fuel consumption

Possible causes

Faulty or worn cylinder 3 injector with delayed or inconsistent response, or incorrect injector correction datalikely
Wiring or connector fault in the cylinder 3 injector circuit, such as high resistance, chafing or corrosionlikely
Crankshaft or camshaft position sensor signal fault, or a reluctor or trigger wheel problem causing inaccurate timing referencepossible
Fuel pressure problem, such as a weak or erratic high pressure pump, pressure regulator or rail pressure sensor faultpossible
Mechanical timing error, such as a stretched or slipped timing chain or belt or incorrect valve timingpossible
Outdated or faulty engine control unit calibration where a known software fault is documented for the enginerare
Internal engine control unit driver fault for the cylinder 3 injectorrare

How to diagnose

Read all stored and pending codes and note freeze frame data, including engine speed, load, temperature and fuel pressure when the fault set
Check for related codes covering other cylinders, rail pressure, crank or cam correlation and misfire, and deal with those first
Inspect the cylinder 3 injector wiring and connector for damage, corrosion, oil ingress and poor pin tension
Check live data for injection timing, fuel rail pressure actual against target, and cylinder balance or correction values, as available for the engine
Check crank and cam sensor signals and correlation using a scope or live data, and inspect the sensors and trigger wheels
Test injector electrical resistance and the drive signal on cylinder 3 against the manufacturer specification for the model
Check mechanical timing against the manufacturer procedure, including chain or belt stretch and marks, if signals point that way
Check for any available manufacturer calibration updates or technical bulletins for this engine and fault

How to fix

Repair or replace damaged wiring or connectors in the cylinder 3 injector circuit
Replace a faulty cylinder 3 injector and code or adapt it correctly to the control unit as the manufacturer requires
Replace a faulty crank or cam position sensor, or repair the trigger wheel
Repair the fuel supply or high pressure fault, such as the pump, regulator or rail pressure sensor
Correct the mechanical timing fault, replacing worn chain, belt or tensioners as needed
Apply an updated manufacturer calibration only if a known calibration fault is confirmed for the engine

Can I keep driving?

Medium severity

The car can usually be driven a short distance to a workshop, but avoid heavy loads and high revs. Over-advanced injection can cause harsh combustion and engine damage, so stop driving if there is heavy knocking, misfire or loss of power.

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