Powertrain, generic (extended)

P2307 Ignition Coil C Primary Control Circuit High

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P2307 sets when the coil C control line, cylinder 3 in most layouts, is shorted to a voltage source. On GM's 3.6-litre LLT V6 (2008) the check is a continuity test against voltage that runs below 6,000 rpm with the battery between 9.99 and 18.1 V and needs 4 s at a stretch or 50 s in total. Do not trust the letter blindly on Ford: special service message 52342 for the 2021–2024 Bronco 2.3 and 3.0 EcoBoost explains that the PCM may file P2307 and its neighbours under the wrong cylinder, while still cutting fuel to the cylinder it has blamed. Ford's advice is a power balance test with its scan tool; the cylinder that drops out without a code of its own is the one to repair. Saab's Trionic 8 treats an open line on cylinder 3 as P2307 as well.

Likely causes

Coil C control wire touching a battery-voltage line

Coil C with an internal short to its supply

Code filed against the wrong cylinder by PCM software (Ford Bronco SSM 52342)

Broken control wire on systems reporting opens here (Saab Trionic 8)

Symptoms

Check engine light on
Cylinder 3 misfires
Power loss, engine runs rough

Repair estimate

DifficultyMediumDIY possible

Parts and labour€40–400

Time0.3–2 h

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

Parts involved

ignition coilcoil driverignition wiring

Related codes

P2306 P2308 P0353 P2304 P0303

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