P2B0D: Cold Start Cylinder 6 Injection Pulse Performance
What to do
Drivable, but this is an early warning worth taking while it is cheap. One cylinder is drifting away from its neighbours — commonly a clogging or leaking injector — and the module is running out of trim to hide it. Injector cleaning or one injector now is the good outcome; ignored, unequal cylinders wash bores, dilute oil and load the aftertreatment with what they leave unburnt.
What this code means
Cylinder 6's cold-start injection pulse correction is not performing as expected.
The same per-cylinder trim, measured in the one condition that hides nothing: a cold start. Cold fuel atomises badly, cold bores quench combustion, and the module compensates with a dedicated cold-start injection strategy. Because the engine is unwarmed and unforgiving, an injector that still passes muster warm can fail its audition cold — this code is that cylinder failing it.
The pattern is the tell. Rough running, clatter or smoke in the first minute that cleans up as the engine warms, with this code stored, points at one cylinder's cold delivery. The same one-cylinder logic applies as with the warm-running codes: swap the named cylinder's injector with a neighbour and see whether the complaint follows it.
Likely causes
Start here
- Clogged fuel injectors · moderate
- Leaking fuel injector · specialist
Less common
- Failed fuel injector · specialist
- Low fuel pressure · specialist
- Corroded or loose connector · specialist
Symptoms
Components involved
Information, not instruction
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