P2306Ignition Coil C Primary Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- With P2306 the engine module has seen the output for coil C, cylinder 3 at GM, Saab and VW, dragged down to ground. Ford explains where such a fault can sit on engines whose coils carry their own driver: the coil-driver chip in the PCM watches current and voltage at its output, so the culprit may be the PCM, the harness, the plug-in connection at the coil or the driver electronics inside the coil – but not the windings, which only the misfire monitor sees. The check is continuous, needs 200 rpm, positive torque and 11–16 V and decides within 1 s. VW's 2014 tables set the low code when the line draws more than 24 mA. Saab's Trionic 8 pairs cylinder 3 with cylinder 1 for its combustion signal. FCA lists P2306-00 for 2023 Alfa Romeo Stelvio 2.0 turbo engines fixed by PCM software.
- What you may notice
- Check engine light on
- Misfire on cylinder 3
- Uneven idle, possibly cylinder shut-off
- Likely causes
- LikelyDriver electronics inside coil C defective
- PossibleCoil C control wire grounded through chafing or a pinched harness
- PossibleCorroded or bent pins at the coil C connector
- RarePCM output or software (FCA 2023 reflash)
- 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.