Network, generic (extended)

U3000 Control Module

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U3000 is the catch-all for a fault inside the module that stores it; the attached failure-type byte says what kind. GM's front camera module uses :41 checksum, :42/:44 memory, :49 internal electronics and :51 not programmed, all without MIL, and then drops adaptive cruise. In a GM brake module the same code covers hardware self-tests and is Type A, while Ford's 2014 Boss 302S list marks U3000 in the PCM as MIL-relevant. Ford SSM 47982 notes that the cruise module of 2017–2019 Super Duty trucks can log U3000:49 after a weak battery: if it stays away after clearing, the module is kept. Mazda (15-002/19) replaced forward cameras that stored a permanent U3000:04. The module named in the scan matters more than the code.

Likely causes

Weak or discharged battery leaving a stored internal-fault entry
Module software or calibration that needs an update or reprogramming
Real internal defect such as memory or processor failure in the module
Module running too hot, e.g. a windshield camera in strong sun

Symptoms

  • Warning or service message for the system run by the affected module
  • Assistance or comfort function switched off, e.g. adaptive cruise or lane keeping
  • Often no noticeable fault if the entry came from a one-off voltage dip

Repair estimate

DifficultyHardWorkshop job
Parts and labour€50–1,500
Time0.3–3 h

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

Parts involved

control module

Related codes

U3003U3001U3002P0606P0602

References: gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov, static.nhtsa.gov.