Powertrain, shared range

P340B Deactivation/Intake Valve Control Circuit Bank 2

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P340B mirrors P340A for bank 2, the bank that does not contain cylinder 1, so it only applies to V or boxer engines. It marks an electrical fault in a control circuit that switches the intake valves of that whole bank at once. No manufacturer documents this code publicly. The widespread V8 systems put the deactivating cylinders of bank 2, cylinders 4 and 6 on GM and Chrysler engines, on their own solenoids and report them as P3425 or P3441. Honda's VCM V6 watches bank 2 via a rocker arm oil pressure switch and stores P3497. CARB asks for circuit checks of such outputs. The bank 1 counterpart is P340A, the bank 2 exhaust circuit P340D, the function code P341B. Usually the only effects are the lamp and lost economy.

Likely causes

Chafed, open or shorted wire to the bank 2 actuator
Oil or moisture in the bank 2 actuator connector
Defective bank 2 intake deactivation actuator coil
Engine control module output stage fault

Symptoms

  • Check engine lamp on
  • Engine runs on all cylinders permanently
  • Slightly higher fuel consumption

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

P340AP340DP341BP3497P3425

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