Powertrain, generic · Fuel and air metering (injector circuit)
P026B Injection Timing Performance
Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo
P026B is the engine-wide injection timing monitor: CARB requires diesels from 2010 to detect injection that is too early or too late overall, or a timing control at its limit. Unlike P020A ff (per cylinder) it concerns the engine as a whole. It is documented on the Ram 6.7 Cummins, together with the per-cylinder timing and balance codes; FCA describes it as set falsely by software and fixes it with an engine module update, without publishing thresholds. GM and Ford handle timing with per-cylinder codes instead (P01CB ff, P2B11 ff).
Likely causes
Engine module software (false setting)
Injectors coked or worn (changed start of injection)
Rail pressure or fuel supply problems (pump, filter, fuel quality)
Crankshaft or camshaft signal inaccurate
Symptoms
- Check engine light on
- Often nothing noticeable (false setting)
- Possibly knocking, rough running or more smoke
Repair estimate
DifficultyHardWorkshop job
Parts and labour€100–3,500
Time0.5–6 h
Typical range across vehicles; the real cost depends on what the testing finds.
Parts involved
fuel injectorsengine control modulefuel rail
Related codes
References: law.cornell.edu, static.nhtsa.gov, static.nhtsa.gov.