P2331 code meaning
Ignition Coil K Primary Control Circuit High
Powertrain system Generic code P23xx codes Check engine light
What P2331 means
P2331 is the short-to-power version for coil K, cylinder 11 in a straightforward count. No manufacturer documents this code publicly; neither Ford nor GM, whose OBD descriptions explain the primary codes in detail, build engines with eleven or more coils. By analogy with Ford's description of P2301 to P2328, the driver would register current or voltage above the short-circuit limit while switched, and many systems then disable the injector of that cylinder to keep raw fuel out of the catalysts – Ford does this for 30 s at a time. On a V12 the loss of one cylinder is subtle, so the warning light may be the first sign. Look for a coil lead rubbing against a supply wire and for a coil with internal leakage; the low-side partner is P2330.
P2331 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor0.5 to 4 hours
- Clears after repairAfter a drive cycle
Symptoms of P2331
- Check engine light on
- Cylinder 11 may be fuel-cut temporarily
- Slightly uneven idle
Common causes of P2331
- Most likelyCoil K signal wire shorted to a supply wire
- PossibleCoil K with internal leakage
- Less likelyEngine module output for coil K 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 P2331 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. |
| 31 | The exact fault in that area. |
What to do next
- Note P2331 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 P2331
What does P2331 mean?
P2331 means "Ignition Coil K Primary Control Circuit High". P2331 is the short-to-power version for coil K, cylinder 11 in a straightforward count. It is a generic code, so it means the same on every make.
Is it safe to drive with P2331?
Drive gently and only to a workshop. With P2331 the car can go into limp mode (reduced power) to protect itself.
Will P2331 fail an emissions test?
Yes, it can. P2331 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 P2331 to fix?
Difficulty: hard. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P2331 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.