Powertrain, generic (extended)

P2C61 Cylinder 8 Fuel Injector B Offset Learning At Max Limit

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modeNo

P2C61 closes the series: injector B of cylinder 8 has driven its learned offset into the ceiling, so this valve stays short of fuel despite the longest correction allowed. Because a weak supply pump or low rail pressure would starve every injector of the same set, a Max code on a single cylinder narrows the search to that valve, its wiring or the air path of that cylinder. A lean system B trim on bank 2 (P2BF2) fits the picture on most V8 numbering schemes. Ford's published OBD summaries for the V8 with both injection types omit P2C61, and no other manufacturer documents it; Volvo's bulletin for the Max codes stops at cylinder 4. California's OBD rule (CARB 1968.2, section (e)(6.2.2)) makes an adaptation without remaining range a reportable fault.

Likely causes

Varnish or deposits in injector B of cylinder 8, slow opening

Corroded or loose connector, chafed wire or voltage drop at this injector

Old adaptation values left at the limit after a repair or software change

Air leak at the intake runner of cylinder 8 (only where the learn uses exhaust oxygen)

Symptoms

Check engine light
Often nothing else noticeable
Possibly uneven idle or lean misfire on cylinder 8

Repair estimate

DifficultyMediumWorkshop job

Parts and labour€0–1,200

Time0.5–5 h

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

Parts involved

fuel injector b cyl 8ecm

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