Powertrain, shared range

P3407 Cylinder 1 Exhaust Valve Control Circuit Low

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modeNo

P3407 stands for a short to ground in the control circuit of a dedicated exhaust valve actuator on cylinder 1. No manufacturer documents this code publicly, so there are no published thresholds. As an analogy, GM's intake-side code P3403 counts an impedance under 0.5 ohm to ground, seen with the driver off, as a fault. CARB requires such output circuits to be checked for shorts. Engines with one shared solenoid per cylinder, like GM's AFM and DFM V8s, report this fault under the intake-side codes instead. An open exhaust circuit would be P3405, a short to power P3408. The car usually keeps running normally on all cylinders, with a warning lamp.

Likely causes

Actuator control wire shorted to ground

Internal short in the exhaust valve actuator

Engine control module output stage fault

Symptoms

Check engine lamp on
No change 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

Related codes

P3405 P3406 P3408 P3403 P3400

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