Powertrain, generic (extended)

P2303 Ignition Coil B Primary Control Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2303 tells you that the trigger wire of coil B – cylinder 2 in GM, Saab and VW documentation – has found a path to ground. On the Saab 9-5 2.0 turbo (GM LDK engine, 2010) the check runs continuously below 6,000 rpm with 9–18 V on the ignition feed and sets after 4 s of uninterrupted short or 50 s added up; as a Type B code it turns on the MIL only after a second failing trip. Saab's test plan swaps the suspect coil with that of a healthy cylinder: if the code moves, the coil is bad, otherwise the wiring or the ECM. Ford bulletin 24-2406 warns that Bronco 2.3 (2021–2024) and 3.0 EcoBoost (2022–2024) engines may log P2303 against the wrong cylinder and need a PCM update. FCA's 2023 Alfa Romeo 2.0 turbo bulletins also list P2303-00. Open line: P0352.

Likely causes

Coil B (cylinder 2) faulty, pulling the control line low
Insulation damage on the coil B control wire touching ground
PCM software assigning the code to the wrong cylinder (Ford Bronco, FCA 2.0 turbo)
Engine module output stage defective

Symptoms

  • Check engine light on
  • Misfire on cylinder 2
  • Engine runs on fewer cylinders, less power

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

P2304P2305P0352P2300P0302

References: saabwisonline.com, saabwisonline.com, static.nhtsa.gov, static.nhtsa.gov.