Powertrain, shared range

P340A Deactivation/Intake Valve Control Circuit Bank 1

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P340A is meant for engines that switch the intake valves of a whole bank through a shared control circuit, rather than one solenoid per cylinder. It reports an electrical fault in that bank 1 circuit, without saying whether it is open or shorted. No manufacturer documents this code publicly, which leaves it without known limits; CARB merely demands that outputs of this kind be monitored for breaks and shorts. The common systems are built per cylinder: GM's DFM V8 has one solenoid per cylinder in the valley, so faults go to codes such as P3401. Honda's VCM V6 reports bank-level trouble as P3400. Bank 2 is P340B, the exhaust side P340C, the bank 1 function check P341A. Expect a warning lamp and no reduced-cylinder mode.

Likely causes

Damaged, open or shorted wire in the bank 1 control circuit
Corroded or loose connector at the bank 1 actuator
Bank 1 intake deactivation actuator with open or shorted coil
Output stage fault in the engine control module

Symptoms

  • Check engine lamp on
  • Cylinder deactivation disabled on bank 1
  • Higher fuel consumption at light load

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

P340BP340CP341AP3400P3401

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