Network, generic

U0407 Invalid Data Received From Glow Plug Control Module

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

U0407 is stored when the engine controller receives data from the glow plug control module that it rejects as implausible. Volkswagen lists the code in the 2014 Touareg diesel OBD chart as Invalid Data Received From Glow Plug Control Module 1, criterion implausible messages received. On that engine the glow unit talks to the ECM over LIN; VW uses U0106 for a missing LIN message and U0307 for a failed software check, which separates the three siblings clearly. Ford's 2012 OBD summary shows the same U04xx idea for other modules: data arrive but are faulted. Because the glow module also reports plug faults, invalid data can hide real glow plug problems. Expect hard cold starts, white smoke and on a diesel usually the MIL.

Likely causes

LIN wire or connector between glow module and ECM corroded or loose
Glow plug control module internally faulty
Voltage dip during glow check or cranking
Glow module software does not match the ECM

Symptoms

  • Check engine or glow plug light on
  • Hard starting in cold weather
  • White smoke and rough idle after cold start

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–600
Time0.5–2 h

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

Parts involved

glow plug control moduleengine control modulevehicle bus wiring

Related codes

U0106U0307U0406

References: static.nhtsa.gov, http:, en.wikipedia.org.