U0300Internal Control Module Software Incompatibility
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- U0300 is the general entry of the U03xx group: the module storing it finds that its own software, calibration or configuration does not fit, or that the modules around it run versions that do not belong together. It typically follows a module swap or flash. Ford's 2012 OBD summary uses it for a software version mismatch between electronic throttle processors, without MIL on Gen2 and with MIL on Gen3/Gen4. Volkswagen names it beside U0301/U0302 after ECM replacement on 2013-2018 gasoline cars (tip 01-18-10TT), Nissan in the TCM of the 2021-2023 Rogue after TCM or CVT replacement (NTB23-085), Mazda as U0300:57 in the BCM after a software update (SA-003/22), Jeep in the air suspension module with MIL (08-159-23). Effects range from a lamp to no start.
- What you may notice
- Warning lamp or MIL, depending on the module
- Function of the affected module limited, e.g. suspension levelling or throttle
- Code appears right after module replacement or software update
- Likely causes
- LikelyModule replaced without loading the latest software and configuration
- PossiblePartner module left on an older software level after an update
- PossibleWrong module or part number fitted (e.g. with a replacement gearbox)
- RareProgramming aborted due to low voltage
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €80 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.