P2310Ignition Coil D Primary 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
- P2310 sets when the coil D control line, belonging to cylinder 4, carries voltage while the engine module tries to switch it to ground. Saab's Trionic 8 (9-3, 2003) uses a 2 V limit held for over 1 s and evaluates cylinder 4 together with cylinder 2 for its ion-based combustion signal; the injector of the affected cylinder is shut off. GM shows how much the warning behaviour can differ within one maker: its 2019 common engine table rates the coil short-to-power codes as Type A with the MIL in the first trip, whereas the 5.3-litre L84 V8 table of the same year makes P2310 a Type B code that waits for two trips. The Saab 9-5 2.0 turbo also runs it as Type B. VW's 2014 tables flag the high condition above roughly 5.1–7.0 V.
- What you may notice
- Check engine light on
- Cylinder 4 misfiring, injector shut off
- Rough idle
- Likely causes
- LikelyCoil D control wire shorted to a voltage source
- PossibleInternal fault in coil D
- RareInterrupted line reported as high on Saab Trionic 8
- RareDefective driver in the engine module
- 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: €40 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.