Powertrain, generic · Computer and auxiliary outputs

P06E2 Cylinder 12 Glow Plug Control Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

Diesel glow systems switch each plug through its own power semiconductor and switch off a faulty channel; CARB requires single-plug detection from model year 2010. P06E2 means the circuit to the cylinder 12 glow plug is shorted to ground or draws overcurrent. For cylinders 1–8, GM's engine-module drivers flag below 0.11 Ω to ground after two trips, and Ford's 2023 Power Stroke more than 22 A for 0.3 s or 20–22 A for 2 s while heating. The channel is switched off and the plug stays cold; the other plugs keep working. An internally shorted plug or a chafed wire is the usual cause. No manufacturer document available to us uses this code – it needs at least 12 cylinders, and the only US OBD II diesel above eight, VW's Touareg V10 TDI, has ten; the description follows cylinders 1–8.

Likely causes

Cylinder 12 glow plug shorted internally
Plug wire chafed through to ground
Burnt connector or terminal nut, tracking through oil or moisture
Driver stage in the glow module defective

Symptoms

  • Check engine light (GM: also glow plug lamp)
  • Harder cold start in frost
  • Rough cold idle, white smoke after cold start
  • Cylinder 12 misfire when cold

Repair estimate

DifficultyMediumDIY possible
Parts and labour€80–800
Time1–4 h

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

Parts involved

glow plugglow plug wiringglow plug control module

Related codes

P06E3P0682P06C4P06D0P06F5

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