P026BInjection Timing Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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).
- What you may notice
- Check engine light on
- Often nothing noticeable (false setting)
- Possibly knocking, rough running or more smoke
- Likely causes
- LikelyEngine module software (false setting)
- PossibleInjectors coked or worn (changed start of injection)
- PossibleRail pressure or fuel supply problems (pump, filter, fuel quality)
- RareCrankshaft or camshaft signal inaccurate
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €3,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.