Powertrain, generic · Computer and auxiliary outputs

P06F7 Glow Plug Control Module 2 Control Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P06F7 means the command line from the engine module to glow plug control module 2 is too low, typically shorted to ground – the counterpart of P0383 for module 1. The engine module's output driver detects the short by its current when switched on or by the line voltage when switched off. No manufacturer document available to us uses a second glow module – Ford's and GM's V8 diesels drive all eight plugs from one; the code suits systems with one module per cylinder bank. The description follows module 1 (P0383). An open line is P06F6, a short to positive P06F8. The plugs of module 2 then heat poorly or not at all, typically on one bank.

Likely causes

Command line to glow module 2 chafed through to ground
Moisture or corrosion in the connector bridging to ground
Input of glow module 2 or engine module driver faulty

Symptoms

  • Check engine light, possibly glow plug/wait-to-start lamp
  • Hard cold start, long cranking in frost
  • Rough cold idle and white smoke, often one cylinder bank only
  • Usually no symptoms when warm

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–600
Time0.5–3 h

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

Parts involved

glow plug control module 2module wiringengine control module

Related codes

P0383P06F6P06F8P06F5

References: law.cornell.edu, fordservicecontent.com, gsi.ext.gm.com.