P2301Ignition Coil A 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
- P2301 is the mirror image of P2300: the control line of coil A, i.e. cylinder 1, carries voltage at a moment when the engine module is trying to pull it low. Saab's Trionic 8 in the 2003 9-3 sets it if the line stays above 2 V for longer than 1 s while the module grounds it; on that system the code also covers a broken line, the injector of cylinder 1 is shut off, closed-loop mixture control and fuel adaption are frozen, and the fault counts as healed after 2 s without the condition. GM tests the line with its driver switched on and treats less than 100 ohms to supply as a fault. Ford's coil-driver check runs from 200 rpm at 11–16 V and stops fuel to the cylinder for 30 s per detection. Usual finds: a coil with an internal short or a wire rubbing against a 12 V feed.
- What you may notice
- Check engine light on
- Cylinder 1 misfires, engine shakes at idle
- Jerking and loss of power under load
- Likely causes
- LikelyCoil A with an internal short feeding supply voltage onto the control input
- PossibleControl wire of coil A rubbing against a 12 V line in the harness
- PossibleBroken control line or loose pin (counts as P2301 on Saab Trionic 8)
- RareFaulty output stage 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.