Powertrain, shared range

P3437 Cylinder 5 Exhaust Valve Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P3437 is reserved for an open circuit in a separate exhaust valve actuator on cylinder 5. No manufacturer documents this code publicly. GM, the main user of cylinder 5 deactivation codes (2007 V6, 3.6 L V6, L84 V8), only publishes the intake-side group P3433 to P3436, because its systems switch both valves of a cylinder together; NHTSA's description of Dynamic Fuel Management states that each solenoid feeds intake and exhaust lifters. CARB still expects any emission-relevant actuator to be checked for continuity, which is what this code would report. P3438 to P3440 are the other exhaust codes for cylinder 5, P3433 the intake-side open.

Likely causes

Broken wire or connector to the cylinder 5 exhaust actuator
Open actuator coil
Engine control module driver fault

Symptoms

  • Check engine lamp on
  • Cylinder deactivation locked out

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

P3438P3439P3440P3433P3400

References: law.cornell.edu, static.nhtsa.gov.