Powertrain, generic (extended)

P2308 Ignition Coil C Secondary Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P2308 points at the high-voltage path of coil C, normally cylinder 3: winding, boot and plug. The code is uncommon. FCA's 3.6 V6 in the 2015–2016 Caravan and Town & Country calls it coil 3 secondary circuit with insufficient ionization. For vans built from late July to mid September 2015 FCA bulletin 18-069-16 swapped the PCM and flashed current software, keeping the battery between 13.2 and 13.5 V on a charger during the flash; the labour allowance is half an hour. Ford and GM tables list no secondary-circuit code for coil C at all; there a weak spark only becomes visible as misfire (P0303). Because each misfire sends unburned fuel into the exhaust, CARB requires the MIL to flash once misfire rates threaten the catalyst. Check plug and boot before suspecting the module.

Likely causes

Spark plug of cylinder 3 worn or fouled
Boot of coil C leaking high voltage
FCA vans built 27 July–11 September 2015: PCM fault (bulletin 18-069-16)
Coil C secondary winding faulty

Symptoms

  • Check engine light on
  • Misfire on cylinder 3 with P0303 stored
  • Engine runs rough

Repair estimate

DifficultyMediumDIY possible
Parts and labour€30–900
Time0.3–3 h

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

Parts involved

ignition coilspark plug

Related codes

P2306P2307P2311P0303P0300

References: static.nhtsa.gov, newtonnet.co.uk, law.cornell.edu.