Powertrain, shared range

P341B Deactivation/Intake Valve Control Circuit Performance Bank 2

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

With P341B the controller judges that intake deactivation on bank 2 is not doing its job even though no circuit fault is present: cylinders keep breathing when they should be sealed, or stay sealed after reactivation. No manufacturer documents this code publicly. One way to catch it is described in a Delphi patent: pressure pulses in the intake are timed against crank angle, and a missing or extra pulse shows which cylinder misbehaves. In practice, makers use their own codes instead, such as GM's P3498 series per cylinder or Honda's bank code P3497. CARB requires a functional check of such outputs. Electrical faults on the same bank are P340B; bank 1 is P341A. Oil level and quality are the first things to check.

Likely causes

Oil level too low or oil past its service life
Lifter or rocker on bank 2 stuck in one switching state
Control valve on bank 2 sticking or leaking past its seal

Symptoms

  • Check engine lamp on
  • Rough running, mostly at light load
  • Misfire codes on bank 2

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–3,500
Time0–12 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

cylinder deactivation solenoidlifterengine oil

Related codes

P340BP341AP341DP3497P3499

References: law.cornell.edu, patents.google.com, static.nhtsa.gov.