P2652 code meaning
"B" Rocker Arm Actuator System Stuck On (Bank 1)
Powertrain system Generic code P26xx codes Check engine light
What P2652 means
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.
P2652 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.3 to 4 hours
- Clears after repairAfter a drive cycle
Symptoms of P2652
- MIL on, possibly together with P3400 on Honda V6
- Rough or uneven running, especially at low load
- Cylinder deactivation no longer works
Common causes of P2652
- Most 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
- Less likelySwitch signal line shorted to voltage (Honda four-cylinder meaning)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Rocker arm actuator b b1Oil control valveOil pressure switch
What each part of P2652 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 6 | Area: computer (engine control module) and output circuits. |
| 52 | The exact fault in that area. |
What to do next
- Note P2652 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2652
What does P2652 mean?
P2652 means ""B" Rocker Arm Actuator System Stuck On (Bank 1)". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P2652?
Drive gently and only to a workshop. With P2652 the car can go into limp mode (reduced power) to protect itself.
Will P2652 fail an emissions test?
Yes, it can. P2652 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2652 to fix?
Difficulty: medium. A typical repair takes 0.3 to 4 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2652 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.