P2310 code meaning
Ignition Coil D Primary Control Circuit High
Powertrain system Generic code P23xx codes Check engine light
What P2310 means
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.
P2310 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 P2310
- Check engine light on
- Cylinder 4 misfiring, injector shut off
- Rough idle
Common causes of P2310
- Most likelyCoil D control wire shorted to a voltage source
- PossibleInternal fault in coil D
- Less likelyInterrupted line reported as high on Saab Trionic 8
- Less likelyDefective driver in the engine module
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 P2310 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. |
| 10 | The exact fault in that area. |
What to do next
- Note P2310 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 P2310
What does P2310 mean?
P2310 means "Ignition Coil D Primary Control Circuit High". P2310 sets when the coil D control line, belonging to cylinder 4, carries voltage while the engine module tries to switch it to ground. It is a generic code, so it means the same on every make.
Is it safe to drive with P2310?
Drive gently and only to a workshop. With P2310 the car can go into limp mode (reduced power) to protect itself.
Will P2310 fail an emissions test?
Yes, it can. P2310 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 P2310 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 P2310 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.