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U0300 Internal Control Module Software Incompatibility

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Module replaced without loading the latest software and configuration
Partner module left on an older software level after an update
Wrong module or part number fitted (e.g. with a replacement gearbox)
Programming aborted due to low voltage

Symptoms

  • 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

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–800
Time0.3–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

control modulecontrol module software

Related codes

U0301U0302U0304P0606

References: http:, static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.