Powertrain, generic (extended)

P2320 Ignition Coil G Secondary Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2320 points at the high-voltage half of coil G, normally the coil on cylinder 7, so only engines with seven or more cylinders can log it. FCA is the maker on record: STAR case S2118000002 from March 2021 for the 2020–2021 Ram 1500 names P2320 as coil 7 secondary circuit with insufficient ionization. Insufficient ionization means the PCM saw too little ion current across the plug gap after the spark, a sign of weak or missing combustion in that cylinder. FCA's first step is a pull-push-pull check of the coil connector to see whether it is fully seated and locked, followed by normal diagnosis if the code returns. A shorted control wire on the same coil instead sets P2318/P2319, an open one P0357. Expect a rough-running engine and often P0307 alongside.

Likely causes

Coil 7 connector not fully seated or latched (FCA)
Spark plug of cylinder 7 worn, fouled or with wrong gap
Coil G secondary winding or boot breaking down
Ion-current evaluation in the PCM faulty

Symptoms

  • Check engine light on
  • Misfire felt on cylinder 7, often with P0307
  • Engine shakes at idle or under load

Repair estimate

DifficultyMediumDIY possible
Parts and labour€20–450
Time0.2–2 h

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

Parts involved

ignition coilspark plug

Related codes

P2318P2319P2323P2317P0357P0307

References: static.nhtsa.gov, en.wikipedia.org, law.cornell.edu.