P06D2Sensor Reference Voltage E Circuit/Open
- 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 engine module feeds sensors from several regulated 5 V reference circuits; a short at one sensor pulls the whole circuit down and all its sensors report at once – unplug them one by one to find the culprit. P06D2 is the general code for circuit E. GM uses it as the collective code for its fifth 5 V reference: petrol engines 2015–2019 flag a reference outside 4.875–5.125 V in 19 of 39 samples with the lamp in the first trip, the 6.6 L Duramax LML/LGH 4.6 V or less for 0.1 s with two trips; GM includes it in its 'engine power limited' group. Which sensors are on circuit E is not listed. GM's hybrid control module uses P06D2 for a separate 12 V reference.
- What you may notice
- Check engine light
- Several sensor codes at once
- Reduced power or limp mode
- Possibly starting problems
- Likely causes
- LikelyShort in the wire or sensor of a connected sensor
- PossibleChafing or water in harness or connector
- PossibleA connected sensor faulty internally
- RareModule internal voltage regulator or components
- 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: €80 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.