P2B1E Cylinder 8 Injection Pulse Offset Not Learned

P2B1E means injector 8 has not received a learned pulse offset. As the final cylinder in the group it belongs to V8 engines; Ford's 6.7 L V8 would be the obvious candidate, but Ford publishes only the exceeded-limit code P2B1F for it, so no manufacturer source for P2B1E exists. CARB leaves the time allowed for learning to the manufacturer: per (f)(4.2.4)(A)(i) a fault exists when feedback control has not begun within that interval. Because an eight-cylinder needs one learned set per injector and pressure level, GM patented an extrapolation of values to shorten the learning time. In service the code mostly points to a learn that was reset or never had suitable coasting phases; only if it comes back under good conditions do injector 8, its wiring or the crank signal come into question.

Likely causes

Symptoms

• Warning lamp
• Mostly no noticeable change in running

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.