Powertrain, shared range

P3479 Cylinder 10 Exhaust Valve Control Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P3479 shows a short to ground, or another cause of a low signal, on the control line of the cylinder 10 exhaust valve actuator. No manufacturer documents this code publicly; J2012 reserves the codes for cylinders 9 to 12 for engines with more than eight cylinders. Engines with ten or more cylinders that deactivate cylinders include Audi's R8 V10, Lamborghini's Huracán V10 and Aventador V12, and Bentley's W12; the published descriptions of all of them talk about whole banks, not about a valve actuator per cylinder. If an engine does carry one, the check mirrors the intake low test known from GM's V8s: resistance to ground with the output off. Repair is wiring or actuator work around cylinder 10. Siblings: P3477 (open), P3480 (high), P3475 (intake low).

Likely causes

Exhaust actuator wire of cylinder 10 shorted to ground
Exhaust actuator shorted internally
Control module output stage faulty

Symptoms

  • Check engine lamp on
  • Fuel-saving cylinder shut-off inactive

Repair estimate

DifficultyMediumDIY possible
Parts and labour€60–900
Time0.5–4 h

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

Parts involved

cylinder deactivation solenoidwiring harnessecm

Related codes

P3477P3478P3480P3475P3497

References: law.cornell.edu, media.audiusa.com, newatlas.com, bentleymedia.com.