Skip the auto shop - Our mechanics make house calls
  1. Home
  2. Articles
  3. P2652 OBD-II Trouble Code: B Rocker Arm Actuator System Stuck On Bank1

P2652 OBD-II Trouble Code: B Rocker Arm Actuator System Stuck On Bank1

Check Engine Light

P2652 code definition

B Rocker Arm Actuator System Stuck On Bank1

What the P2652 code means

The Engine control module (ECM) has a wide variety of jobs, but one of the most critical is to keep the supply of oil within mechanically safe ranges. The engine depends on oil to produce a frictionless environment for the engine components moving at extremely rapid speeds. Without oil, internal engine components, such as rocker arms, will overheat and may scrape against their mating surface, instead of sliding.

The ECM uses sensors such as a rocker arm actuator, or oil pressure switch, to regulate the flow of oil to the engine. If trouble code P2652 sets, it means the ECM has detected an abnormality regarding the feedback it is receiving from the rocker arm actuator.

The rocker arm actuator is an oil pressure switch which controls the flow of oil to critical upper engine cylinder head components. The rocker arm actuator is a unit consisting of oil passages governed by the ECM; passage operation will alternate depending on the driving conditions, and each particular passage will vary oil pressure to the cylinder head.

The ECM has a “blueprint” of the manufacturer’s required oil pressure for the vehicle, and it will try to keep the oil pressure within that range by operating the passages within the rocker arm actuator to increase or limit the oil flow to the cylinder head. The actuator will measure how much oil is flowing through it and report it to the ECM. The ECM will administer changes where it sees fit. If the rocker arm actuator is out of range and the ECM is unable to make the changes needed to bring the response from the actuator back to a desirable range, a code P2652 may set.

What causes the P2652 code?

  • Low or overfilled oil
  • Faulty rocker arm actuator
  • Incorrect oil type
  • Faulty ECM
  • Engine mechanical fault

What are the symptoms of the P2652 code?

  • Check Engine Light illumination
  • Audible tap or tick from engine
  • Vehicle may enter limp mode and limit speed to under 40 miles per hour
  • Faulty oil pressure sensor
  • Faulty oil pump

How does a mechanic diagnose the P2652 code?

  • Checks the oil pressure of the engine
  • Inspects the screens of the oil pressure sensor and rocker arm actuator
  • Inspects the quality and level of the engine oil
  • Inspects the wiring of the oil pressure sensor and rocker arm actuator for opens or shorts in the circuit (also tests with a multimeter)
  • Checks Technical Service Bulletins (TSB’s) - some vehicles do have a TSB related to the P2652 trouble code

Common mistakes when diagnosing the P2652 code

Many mechanics may misidentify the location of the rocker arm actuator at fault. Generally, there are two rocker arm actuators (A, B). It is important to use a proper diagram for your specific vehicle to distinguish the two actuators.

How serious is the P2652 code?

It is fairly serious because the rocker arm actuator controls the oil flow to critical upper engine components. The rocker arm actuator must be in working order for the engine to receive proper lubrication. Lack of lubrication is a common cause of engine failure.

What repairs can fix the P2652 code?

Additional comments for consideration regarding the P2652 code

Researching the TSB’s pertaining to your specific vehicle can greatly assist in a proper, correct, and expedited repair

Need help with a P2652 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

How to Transfer a Car Title in Idaho
In order to prove ownership of a car, you must have the title. However, when a car is sold, given away or inherited, the title needs...
Veteran and Military Driver Laws and Benefits in New Mexico
The state of New Mexico offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch...
P2159 OBD-II Trouble Code: Vehicle Speed Sensor B Range/Performance
Diagnostic Trouble Code (DTC): P2159 P2159 code definition Vehicle Speed Sensor B Range/Performance...


Related questions

Q: OD2 scanner read trouble code P0101

Your computer may not be able to correctly interpret the data from the mass airflow sensor on your engine causing the P0101 code to keep returning. The manufacturer has a Technical Service Bulletin that came out January 30th of 2015....

Q: Check engine light is on.

Hi there. Check the wastegate on the engine and see if its opening when the engine is throttling and letting off the throttle. If the wastegate is not moving, then check the hose to the wastegate and see if its...

Q: I'm having problems with code po740

Hi there. In order to be able to give you more exact information I would need to know whether or not the vehicle is equipped with the CVT transmission. It sounds like you have the regular transmission in your vehicle....