Powertrain, generic (extended)

P2310 Ignition Coil D Primary Control Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2310 sets when the coil D control line, belonging to cylinder 4, carries voltage while the engine module tries to switch it to ground. Saab's Trionic 8 (9-3, 2003) uses a 2 V limit held for over 1 s and evaluates cylinder 4 together with cylinder 2 for its ion-based combustion signal; the injector of the affected cylinder is shut off. GM shows how much the warning behaviour can differ within one maker: its 2019 common engine table rates the coil short-to-power codes as Type A with the MIL in the first trip, whereas the 5.3-litre L84 V8 table of the same year makes P2310 a Type B code that waits for two trips. The Saab 9-5 2.0 turbo also runs it as Type B. VW's 2014 tables flag the high condition above roughly 5.1–7.0 V.

Likely causes

Coil D control wire shorted to a voltage source
Internal fault in coil D
Interrupted line reported as high on Saab Trionic 8
Defective driver in the engine module

Symptoms

  • Check engine light on
  • Cylinder 4 misfiring, injector shut off
  • Rough idle

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

P2309P2311P0354P2307P0304

References: saabwisonline.com, gsi.ext.gm.com, gsi.ext.gm.com, saabwisonline.com.