P2312Ignition Coil E Primary Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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.
- What you may notice
- Check engine light on
- Misfire on cylinder 5
- Rough running, less power
- Likely causes
- 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
- RareWrong cylinder assignment in PCM software (Ford SSM 52455)
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €40 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.