Powertrain, generic · Ignition system or misfire

P0354 Ignition Coil D Primary Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Modern engines have one coil-on-plug ignition coil per cylinder, with the output stage either in the engine module or in the coil itself. P0354 monitors the primary control circuit of coil D – the line from the engine module to the coil or its built-in output stage – for an open circuit or high resistance. GM's module measures the voltage with its low-side driver off and flags an open circuit above 30 kΩ in 50 of 63 samples (2018 engines in the first trip, older ones after two); Ford checks continuously within 1 s, expecting a primary-current feedback for every ignition command, and shuts off injection to that cylinder for 30 s at a time. Short circuits and the secondary side have their own codes (P2300 ff). Coil D usually serves cylinder 4, but the assignment is up to the manufacturer.

Likely causes

Ignition coil D faulty (output stage in the coil or primary winding open)
Connector at the coil corroded, loose or with a spread pin
Control, supply or ground wire open or chafed
Fuse or relay of the coil supply (then usually several codes)
Driver in the engine module faulty

Symptoms

  • Check engine light on
  • Misfire and rough running on cylinder 4, often also P0304
  • Loss of power, jerking under load
  • Cylinder shut off (injection off), risk to the catalyst if driven on

Repair estimate

DifficultyEasyDIY possible
Parts and labour€40–250
Time0.3–1.5 h

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

What to check first

  1. Swap the coil and see if the fault moves
  2. Inspect connector
  3. Check spark plug condition

Parts involved

ignition coil dignition wiringengine control module

Related codes

P2309P2310P2311P0350P0304P0300

References: gsi.ext.gm.com, gsi.ext.gm.com, newtonnet.co.uk, fordservicecontent.com.