Powertrain, shared range

P3473 Cylinder 10 Deactivation/Intake Valve Control Circuit/Open

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modeNo

P3473 reports an open circuit to the deactivation or intake valve actuator of cylinder 10, the last cylinder of a V10. No manufacturer documents this code publicly; J2012 reserves the codes for cylinders 9 to 12 for engines with more than eight cylinders. The V10 engines known for cylinder shut-off are Audi's 5.2 FSI in the R8 and Lamborghini's Huracán from model year 2016. Audi says its system idles one bank in the upper four gears by switching off injection and ignition, so it needs no valve actuator that this code could watch. On a twelve-cylinder engine with valve deactivation the code would mean a broken wire, an open coil or a bad connector at cylinder 10. P3475 and P3476 deal with shorts, P3474 with the mechanical result, P3477 with the exhaust valve.

Likely causes

Wire to the cylinder 10 actuator open or chafed

Cylinder 10 solenoid coil open

Corroded or loose connector at cylinder 10

Engine control module driver failed

Symptoms

Check engine lamp on
Engine no longer switches to reduced-cylinder mode

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

References: law.cornell.edu, media.audiusa.com, pistonheads.com, gsi.ext.gm.com.