OBD-II code · Powertrain (generic, extended)
P2B18 Cylinder 5 Injection Pulse Offset Not Learned
The ECM has not yet learned the per-cylinder injection pulse offset for cylinder 5. Combustion equalisation between cylinders cannot be applied until adaptation completes.
Is it safe to drive with P2B18?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyAdaptation lost after battery disconnect or ECM reset
- PossibleInjector replaced without learn procedure
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.3–6 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Fuel Injector Cyl 5, Ecm
Related codes
- P2B10Cylinder 1 Injection Pulse Offset Not Learned
- P2B12Cylinder 2 Injection Pulse Offset Not Learned
- P2B14Cylinder 3 Injection Pulse Offset Not Learned
- P2B16Cylinder 4 Injection Pulse Offset Not Learned
- P2B1ACylinder 6 Injection Pulse Offset Not Learned
- P2B1CCylinder 7 Injection Pulse Offset Not Learned
- P2B1ECylinder 8 Injection Pulse Offset Not Learned
- P2B15Cylinder 3 Injection Pulse Offset Exceeded Learning Limit
- P2B17Cylinder 4 Injection Pulse Offset Exceeded Learning Limit
- P2B19Cylinder 5 Injection Pulse Offset Exceeded Learning Limit
- P2B1BCylinder 6 Injection Pulse Offset Exceeded Learning Limit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.