P2312 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. 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.

Likely causes

Symptoms

• Check engine light on
• Misfire on cylinder 5
• Rough running, less power

Repair estimate

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

Related codes

References: static.nhtsa.gov, saabwisonline.com, gsi.ext.gm.com, static.nhtsa.gov.