Powertrain, shared range

P3497 Cylinder Deactivation System Bank 2

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P3497 is the bank 2 counterpart of P3400: the control unit concludes that deactivation on the bank that lacks cylinder 1 is failing as a whole, and it blames no single cylinder circuit. Honda's VCM V6 links it to rocker arm oil pressure switch C (P3400 belongs to switch B); bulletin 13-055 for the 2013 Odyssey and Pilot shows both codes after cold starts with oil pressure above 92 psi, which moved the spool valves and cut cylinders the ECU had not selected. The fix there was a new relief valve spring. Ram lists P3497 for the 2023 5.7 l Hemi eTorque and cures it with PCM software (18-002-25). Expect a warning lamp, misfire codes and rough running during warm-up.

Likely causes

Low oil level, wrong grade or overdue oil change on bank 2
Excess oil pressure on cold start, e.g. weak relief valve spring
Switchable rocker arm or lifter on bank 2 sticking or not latching
Rocker arm oil pressure switch of bank 2 reporting wrongly
Engine control software needing an update

Symptoms

  • Check engine lamp on
  • Misfire codes on bank 2 cylinders, mostly after a cold start
  • Rough idle while the engine warms up
  • Reduced-cylinder mode no longer used, higher fuel use

Repair estimate

DifficultyHardWorkshop job
Parts and labour€80–4,000
Time0–12 h

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

Parts involved

cylinder deactivation solenoidlifteroil control valveoil pressure switch

Related codes

P3400P3409P3410P0300P2652

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