Powertrain, generic · Ignition system or misfire

P03F2 B Camshaft Profile Actuator C Control Circuit Low Bank 1

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

With a sliding camshaft, the exhaust camshaft (camshaft B) carries movable cam pieces with several lift profiles; solenoid actuators shoot a pin into a groove in the piece and shift it axially. Actuator C is the third of these actuators – not a profile position. The only known user is GM's 2.7-litre turbo four (L3B, three-step sliding cam, from model year 2019). P03F2 means the control circuit is shorted to ground: GM checks with the driver on and sets the code at 0.5 Ω or less between signal and ground (4 of 5 samples, above 11 V, MIL on the first trip). The actuator can then not shift its cam piece, and lift switching and cylinder deactivation are blocked.

Likely causes

Control wire chafed through and shorted to ground
Shorted turns in the actuator solenoid
Oil or moisture in the connector
Driver in the engine module

Symptoms

  • Check engine light on
  • Lift switching and cylinder deactivation blocked, higher consumption
  • Possibly rough running if a cam piece stays in the wrong position

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–600
Time0.5–2.5 h

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

Parts involved

camshaft profile actuator c exhaustsliding camshaftactuator wiringengine control module

Related codes

P03F1P03F3P03EDP002BP037C

References: gsi.ext.gm.com, law.cornell.edu, gm-techlink.com.