P08D3Shift Solenoid J 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
- Logged when the control line of shift solenoid J reads higher than the commanded state allows, pointing to a short to battery voltage or, on some designs, an open coil. No manufacturer documents this code publicly. In GM's tables the high code for solenoid A, P0974, covers both an open circuit and a short to power, fails after 1.2 of 1.5 seconds and needs two trips for the MIL, while Ford keeps opens apart and uses its high code for shorts to power only. Which reading applies to J therefore depends on the maker. CARB requires the circuit check. P08D2 is the low-side counterpart, P08D4 the dedicated open-circuit code. A valve that cannot be driven correctly leads to wrong or missing gears.
- What you may notice
- Check engine or transmission warning light on
- Wrong gear or harsh engagement
- Possible limp mode
- Likely causes
- LikelyControl wire shorted to a voltage-carrying conductor
- PossibleOpen solenoid coil (on systems that report opens as high)
- RareMoisture in the transmission connector bridging pins
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.