Powertrain, shared range

P3443 Cylinder 6 Deactivation/Intake Valve Control Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

Here the engine computer has found the cylinder 6 solenoid's switched lead pulled to ground. GM spells out the test for its 2019 V8s (L84, L86 and the LT4 Corvette): while the low-side driver is off, an impedance under 0.5 ohm toward ground is a fault, and 20 hits among 25 checks while the powertrain relay supplies at least 11 V store a Type B code. GM adds that some controllers record the open-circuit code P3441 at the same moment, so the pair does not prove two separate faults. On the L84 each solenoid also has a high-side feed, and a short to ground there carries GM's own code P3114. P3444 is the short to voltage on this channel. Cylinder deactivation stays off until the fault is repaired.

Likely causes

Insulation of the cylinder 6 control wire worn through to ground
Cylinder 6 solenoid shorted internally to its housing
Moisture or oil bridging the pins of the solenoid connector
Output stage in the engine control module damaged

Symptoms

  • Check engine lamp on from the second faulty trip
  • Four-cylinder mode no longer available
  • P3441 stored at the same time on some GM controllers

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

P3441P3442P3444P3447P3497

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