P2301 code meaning
Ignition Coil A Primary Control Circuit High
Powertrain system Generic code P23xx codes Check engine light
What P2301 means
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.
P2301 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 P2301
- Check engine light on
- Cylinder 1 misfires, engine shakes at idle
- Jerking and loss of power under load
Common causes of P2301
- Most 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)
- Less likelyFaulty output stage 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 P2301 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. |
| 01 | The exact fault in that area. |
What to do next
- Note P2301 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 P2301
What does P2301 mean?
P2301 means "Ignition Coil A Primary Control Circuit High". P2301 is the mirror image of P2300: the control line of coil A, i.e. It is a generic code, so it means the same on every make.
Is it safe to drive with P2301?
Drive gently and only to a workshop. With P2301 the car can go into limp mode (reduced power) to protect itself.
Will P2301 fail an emissions test?
Yes, it can. P2301 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 P2301 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 P2301 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.