P2303Ignition Coil B 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
- P2303 tells you that the trigger wire of coil B – cylinder 2 in GM, Saab and VW documentation – has found a path to ground. On the Saab 9-5 2.0 turbo (GM LDK engine, 2010) the check runs continuously below 6,000 rpm with 9–18 V on the ignition feed and sets after 4 s of uninterrupted short or 50 s added up; as a Type B code it turns on the MIL only after a second failing trip. Saab's test plan swaps the suspect coil with that of a healthy cylinder: if the code moves, the coil is bad, otherwise the wiring or the ECM. Ford bulletin 24-2406 warns that Bronco 2.3 (2021–2024) and 3.0 EcoBoost (2022–2024) engines may log P2303 against the wrong cylinder and need a PCM update. FCA's 2023 Alfa Romeo 2.0 turbo bulletins also list P2303-00. Open line: P0352.
- What you may notice
- Check engine light on
- Misfire on cylinder 2
- Engine runs on fewer cylinders, less power
- Likely causes
- LikelyCoil B (cylinder 2) faulty, pulling the control line low
- PossibleInsulation damage on the coil B control wire touching ground
- PossiblePCM software assigning the code to the wrong cylinder (Ford Bronco, FCA 2.0 turbo)
- RareEngine module output stage defective
- 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.