P2312 code meaning
Ignition Coil E Primary Control Circuit Low
Powertrain system Generic code P23xx codes Check engine light
What P2312 means
P2312 is the first code of this series that only engines with five or more cylinders can set: it flags the control lead of coil E, i.e. cylinder 5, as shorted to ground. Examples with documented coil E checks are VW's 2.5-litre five-cylinder in the 2014 Passat (low above a current of 24 mA), the Saab 9-5 2.8 V6 (LAU) and GM's LT5 Corvette V8, whose 2019 table rates it Type B after two trips in 50 of 63 samples. On the Saab V6 coil 5 sits on bank 1 together with coils 1 and 3 and shares their supply, so a short there can bring P2300, P2306 and P2312 at once. Ford's 2024 message 52455 for 6.8 and 7.3-litre Super Duty, E-Series and F-650/750 engines lists P2312 among codes that may be filed against the wrong cylinder.
P2312 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 repairAfter a drive cycle
Symptoms of P2312
- Check engine light on
- Misfire on cylinder 5
- Rough running, less power
Common causes of P2312
- Most likelyCoil E (cylinder 5) defective
- PossibleShort in the coil supply shared by one bank (Saab LAU: coils 1, 3, 5)
- PossibleCoil E control wire chafed against ground
- Less likelyWrong cylinder assignment in PCM software (Ford SSM 52455)
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 P2312 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. |
| 12 | The exact fault in that area. |
What to do next
- Note P2312 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 P2312
What does P2312 mean?
P2312 means "Ignition Coil E Primary Control Circuit Low". P2312 is the first code of this series that only engines with five or more cylinders can set: it flags the control lead of coil E, i.e. It is a generic code, so it means the same on every make.
Is it safe to drive with P2312?
Drive gently and only to a workshop. With P2312 the car can go into limp mode (reduced power) to protect itself.
Will P2312 fail an emissions test?
Yes, it can. P2312 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 P2312 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 P2312 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.