P2B10 Cylinder 1 Injection Pulse Offset Not Learned

P2B10 means the engine control holds no valid learned offset for injector 1 – the correction of the opening time used for very small injection quantities has not been established. No manufacturer documents this code publicly. Ford, the one maker with a published monitor for this group, lists only the exceeded-limit codes (P2B11 and siblings) for its Power Stroke diesels. The legal basis is CARB 13 CCR 1968.2 (f)(4.2.4)(A)(i): a fuel system feedback that does not begin working within a time chosen by the manufacturer counts as a malfunction. A Bosch patent explains the learn itself: in overrun the activation time of a test injection is raised in small steps from a value too short to open the injector until the crankshaft speed reacts. P2B11 is the partner for a value that was learned but lies out of range.

Likely causes

Symptoms

• Warning lamp, otherwise often no noticeable effect
• Possibly harder combustion noise at idle on cylinder 1

Repair estimate

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

Related codes

References: law.cornell.edu, patents.google.com, fordservicecontent.com.