P06E3Cylinder 12 Glow Plug Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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. P06E3 means the circuit to the cylinder 12 glow plug is shorted to positive: voltage is present although the driver is off, or no current flows when it is on. For cylinders 1–8, GM's engine-module drivers flag a short to positive below 0.5 Ω after two trips, and Ford's 2023 Power Stroke 0 A while commanded for about 1 s. The plug may glow permanently and fail early; the other plugs keep working. Wiring shorted to supply or a failed driver are the usual causes. 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.
- What you may notice
- Check engine light (GM: also glow plug lamp)
- Harder cold start in frost
- Rough cold idle, white smoke after cold start
- Plug may glow permanently and fail early
- Likely causes
- LikelyPlug wire shorted to supply in the harness
- PossibleDriver stage in the glow module shorted (permanently on)
- PossibleMoisture or corrosion bridging to a supply pin
- RareGlow module software
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €80 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.