Powertrain, shared range

P3432 Cylinder 4 Exhaust Valve Control Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P3432 is the last code of the cylinder 4 block and denotes an exhaust actuator control line sitting at supply voltage. No manufacturer documents this code publicly. The intake-side counterpart P3428 is well covered: For GM's L84, L86 and Corvette LT4 of model year 2019, a supply path below half an ohm, measured while the low-side stage conducts, is logged as a Type B short. Exhaust valves are not forgotten in those engines, they simply switch with the same lifter oil. A GM patent application lets a single hydraulic valve serve both sides, and the cam timing makes the exhaust side drop out earlier than the intake side and also come back sooner. Without a separate exhaust output, this code has nothing to watch. Expect only the lamp.

Likely causes

Exhaust actuator wire of cylinder 4 in contact with battery voltage
Exhaust actuator coil with shorted windings
Output stage of the engine control module defective

Symptoms

  • Check engine lamp on
  • Deactivation unavailable

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

P3429P3430P3431P3428P3424P3440

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