Powertrain, shared range

P3433 Cylinder 5 Deactivation/Intake Valve Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P3433 reports an open control circuit to the deactivation valve of cylinder 5, and GM has used it across three generations. The 2007 V6 with Displacement on Demand, which shut off cylinders 1, 3 and 5, already flagged a short or open after 30 failures in 100 samples at 250 ms above 800 rpm. On the 3.6 L V6 (LGX, LGZ) cylinder 5 is an active fuel management cylinder, and GM tied P3433 to oil leaking from the rocker arm control valve in the camshaft cover. The 2019 L84 V8 tests every cylinder with a 200 kohm limit. Each time it is a Type B code. P3434 to P3436 are the function and short codes for the same cylinder.

Likely causes

Oil leaking at the cylinder 5 control valve into its connector (GM 3.6 L V6)
Broken wire or spread terminal in the solenoid circuit
Open coil in the cylinder 5 solenoid
Engine control module output fault

Symptoms

  • Check engine lamp on
  • Oil seepage at the valve cover control valve (V6)
  • Reduced-cylinder mode no longer used

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

P3434P3435P3436P3437P3409P3400P0305

References: law.cornell.edu, gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov.