Powertrain, generic · Computer and auxiliary outputs

P06F6 Glow Plug Control Module 2 Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P06F6 means the command line from the engine module to glow plug control module 2 is open or has a general circuit fault – the counterpart of P0670 for module 1. The engine module's output driver detects an open load while the driver is 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 (P0670). Shorts on the same line are P06F7 (to ground) and P06F8 (to positive); the feedback line back to the engine module is P06FC/P06FD. The plugs of module 2 then heat poorly or not at all, typically on one bank.

Likely causes

Line from engine module to glow module 2 open, connector loose or corroded
Input of glow module 2 faulty or module not connected
Engine module output 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

P0670P06F7P06F8P06FCP06F5

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