P20CEExhaust Aftertreatment Fuel Injector A Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- The control line of the hydrocarbon doser is shorted to battery voltage. GM's diesel tables 18OBDG04 and 25OBDG04A detect it while the driver is switched on: current above roughly 8 to 11 A for a set time, or above about 16 to 22 A at once, counts as a short to power. GM rates it Type B, so the MIL follows after two trips; the LML/LGH Duramax (15OBDG09) uses a voltage check in the on state. The doser can then no longer be opened on command. Hino's J08E manual names P20CE among the codes to clear before diagnosing a regeneration complaint. Open circuit and short to ground are P20CB and P20CD.
- What you may notice
- Check engine light on
- Active regeneration not possible
- Rising soot load, later reduced power
- Likely causes
- LikelyControl wire touching a powered wire in a damaged harness
- PossibleDoser solenoid with shorted turns drawing too much current
- RareFaulty output stage in the engine control module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €100 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.