SUBARU
11-186-18
Manufacturer communications
- Publication date
- 2018-12-03
- Received by NHTSA
- 2019-02-25
- NHTSA record numbers
- 10153610
Manufacturer summary
Original wording in English
This bulletin announces availability of reprogramming files to optimize the ECM. These files enhance detection of DTC P0300: RANDOM/MULTIPLE CYLINDER MISFIRE DETECTED. If a customer presents with a rough idle concern and / or hesitation after a cold start when using winter-blend fuels, reprogram the ECM following the normal FlashWrite procedure. The new logic contains revised A/F, ignition timing and alternator controls designed to prevent an over-lean fuel mixture condition at cold start and stabilize the engine idle.
Reported code forms
Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
Subaru
P0300RANDOM/MULTIPLE CYLINDER MISFIRE DETECTEDCheck vehicle applicability
A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Subaru | IMPREZA | 2014 |