P2652"B" Rocker Arm Actuator System Stuck On (Bank 1)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2652 means the controller thinks stage B of the bank 1 rocker switching stays engaged after release was commanded, usually because the confirming oil pressure switch still signals pressure. Honda documents it in two ways. For the 2017 Odyssey, Pilot and Ridgeline and the 2017 Acura MDX, RDX, RLX and TLX, Honda dealer messages from 2021–22 describe it as a stuck-on fault of rocker arm oil pressure switch B on bank 1, often stored together with P3400 for the cylinder-pausing Valve Pause System; owners may notice uneven running, and Honda asked dealers to hold such cars for inspection. Bulletin 13-021 for older four-cylinder i-VTEC models instead treats P2647/P2652 as a high-voltage fault in the switch circuit. A solenoid leaking oil while off also fits.
- What you may notice
- MIL on, possibly together with P3400 on Honda V6
- Rough or uneven running, especially at low load
- Cylinder deactivation no longer works
- Likely causes
- LikelyRocker arm oil pressure switch B reporting pressure permanently
- PossibleSolenoid B lets oil through in its closed position
- PossibleLocking pin stuck in the engaged position
- RareSwitch signal line shorted to voltage (Honda four-cylinder meaning)
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €40 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.