Network, generic

U0469 Invalid Data Received From Starter / Generator Control Module

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

U0469 means the engine controller or gateway receives data from the starter/generator control module but cannot trust it. On 48 V mild hybrids this electronics sits in the belt starter generator, which cranks the engine, recuperates and charges both networks. Audi documents the code for A6, A7, A8, Q7, Q8 and related 48 V models from 2018 on: bulletin 2058831 pairs it with P0CA700 in the 48 V battery and first cures it with generator software; later revisions read the stored generator mode and compare requested with delivered torque, which should agree within 5 Nm. Bulletin 2073284 adds that U0469 often follows other CAN faults (U0028/U0029), so a new generator does not help. Ford's 2014 code list carries U0469 without MIL. U0120 is lost contact. Typical signs: electrical system warning, battery symbol, no start-stop.

Likely causes

Outdated software in the starter/generator control module
Other CAN or sensor faults disturbing the hybrid bus, with the generator only reporting the effect
48 V battery or 12 V supply problem upsetting the generator electronics
Internal hardware fault in the belt starter generator

Symptoms

  • Electrical system fault message and yellow or red battery symbol
  • Start-stop and recuperation no longer work
  • 12 V battery not charged while driving

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–1,800
Time0.5–4 h

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

Parts involved

starter generator module

Related codes

U0120P0CA7U0029U0028

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov, performanceparts.ford.com.