P2303 code meaning
Ignition Coil B Primary Control Circuit Low
Powertrain system Generic code P23xx codes Check engine light
What P2303 means
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.
P2303 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.3 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2303
- Check engine light on
- Misfire on cylinder 2
- Engine runs on fewer cylinders, less power
Common causes of P2303
- Most 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)
- Less likelyEngine module output stage defective
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Ignition coilCoil driverIgnition wiring
What each part of P2303 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 3 | Area: ignition system or misfire. |
| 03 | The exact fault in that area. |
What to do next
- Note P2303 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2303
What does P2303 mean?
P2303 means "Ignition Coil B Primary Control Circuit Low". P2303 tells you that the trigger wire of coil B – cylinder 2 in GM, Saab and VW documentation – has found a path to ground. It is a generic code, so it means the same on every make.
Is it safe to drive with P2303?
Drive gently and only to a workshop. With P2303 the car can go into limp mode (reduced power) to protect itself.
Will P2303 fail an emissions test?
Yes, it can. P2303 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2303 to fix?
Difficulty: medium. A typical repair takes 0.3 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2303 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.