P2651 OBD-II Trouble Code: B Rocker Arm Actuator Sys Perf or Stuck Off Bank1

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P2651 code

P2651 is a diagnostic trouble code (DTC) for "B Rocker Arm Actuator Sys Perf or Stuck Off Bank1". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P2651 DIAGNOSTIC Get a fair and transparent estimate upfront

P2651 code definition

The P2651 trouble code notes an electrical circuit that is short or open in the rocker arm actuator control circuit for the exhaust camshaft in engine bank 1.

What the P2651 code means

The P2651 code is a generic OBD-II trouble code that detects a problem with the exhaust camshaft (known as the “B”, and placed on the exhaust side of the cylinder head) rocker arm actuator control circuit in engine bank 1. Engine bank 1 is a specific engine bank where the number one cylinder is located. The powertrain control module (PCM) is given a signal from the exhaust camshaft, and when that signal is more than 10 percent off of the manufacturer’s value, the P2651 trouble code will be detected.

What causes the P2651 code?

A few possible causes for the P2651 trouble code include:

  • Low engine oil level or engine oil pressure
  • Malfunctioning oil control valve
  • An open circuit or connector near the oil control valve
  • In very rare cases, a broken PCM

What are the symptoms of the P2651 code?

The P2651 trouble code will be accompanied by the check engine soon Warning Light on the instrument cluster. The car will also likely have a difficult time idling, may experience jerky acceleration, and will have all-around diminished engine performance.

How does a mechanic diagnose the P2651 code?

The P2651 code will be diagnosed with a standard OBD-II trouble code scanner. A reputable technician will use the trouble code scanner to observe the freeze frame data for the P2651 code to assess it, and will also look for any additional trouble codes. The trouble codes will then be reset, and the vehicle restarted. If the P2651 code does not return after being reset, it is assumed that the code was triggered erroneously, though there may be an intermittent error.

If the P2651 code is still detected after the reset, the technician should first inspect the engine oil to see if the levels and pressure are adequate. Following the engine oil inspection, the oil control valve connectors and circuits should be checked, and the mechanic should make sure that the timing indicators are in proper alignment. If no issues are found, the oil control valve and camshaft sensors should be inspected.

Following repair, the trouble codes should be reset.

Common mistakes when diagnosing the P2651 code

The most common mistake that is made when diagnosing the P2651 code is the failure to adhere to the OBD-II trouble code diagnosis protocol. The trouble code diagnosis protocol should always be followed in the proper order, as that ensures that each component is inspected and repaired in the right order.

A common mistake that is made when protocol is not followed is the replacement of certain components when the only issue causing the P2651 is insufficient oil levels or pressure.

How serious is the P2651 code?

The P2651 trouble code will not keep a car from driving, though the engine performance will probably not meet expectations. However, the P2651 code should always be addressed as soon as it is detected, before further damage is caused to the engine.

What repairs can fix the P2651 code?

Some of the repairs that may fix the P2651 trouble code are:

Additional comments for consideration regarding the P2651 code

Every time a component of the vehicle is replaced or repaired, the trouble codes should be reset, and the vehicle restarted. This will tell the mechanic whether the repair or replacement resolved the issue, and can keep the repair as efficient as possible.

While PCM failure can be a cause of the P2651 trouble code, it is very rare, and should never be assumed unless all other options have been inspected. If the PCM does need to be replaced, it will need to be reprogrammed.

Need help with a P2651 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.

Check Engine Light
trouble codes
P2651

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P2651 code.

SCHEDULE P2651 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(6,328)

Rating Summary
5,857
225
52
35
159
5,857
225
52
35
159

Gustavo

17 years of experience
296 reviews
Gustavo
17 years of experience
Toyota Corolla - Check Engine Light is on - New Braunfels, Texas
As always, punctual and professional. He explains the problem thoroughly. I feel confident in his work and knowledge.

Greg

22 years of experience
86 reviews
Greg
22 years of experience
Mazda 3 - Check Engine Light is on - Queen Creek, Arizona
Greg was scheduled for 1:00 but he was able to come earlier and let us know right away. He was very thorough and spent his time going thru the entire car.

Gustavo

17 years of experience
296 reviews
Gustavo
17 years of experience
Lincoln Aviator - Check Engine Light is on - San Antonio, Texas
Made call before appt. -courteous-knowledgeable-got part need & did prompt repair after computer check.

Claud

8 years of experience
325 reviews
Claud
8 years of experience
Chevrolet Trax - Check Engine Light is on - Grosse Pointe, Michigan
Very good experience. He arrived on time. Explained what he was going to do. Completed the work and was thorough in what I needed for my next service in plain language vs car jargon. I'm a raving fan of Claud!


More related articles

P0477 OBD-II Trouble Code: Exhaust Pressure Control Valve Low
P0477 code means that the PCM has detected an abnormally low voltage reading often due to the exhaust back pressure control valve circuit.
P0871 OBD-II Trouble Code: Transmission Fluid Pressure Sensor/Switch C Circuit Range/Performance
P0871 means there is an issue with the transmission fluid pressure, possibly that it is low, the pump is faulty, or the sensor is dirty.
P0013 OBD-II Trouble Code: B Camshaft Position - Open or Short in Oil Control Valve (OCV) (Bank 1)
P0013 code definition “B” Camshaft Position - Open or Short in Oil Control Valve (OCV) (Bank 1) What the P0013 code means...

Related questions

Engine light won't go off

Your check engine light may come on for many different reasons such as a faulty mass air flow sensor, a faulty O2 sensor, a bad catalytic converter, bad spark plugs or wires and many other reasons. Due to the wide...

2009 Chrysler Sebring intake manifold runner problems

I'm guessing you have the common P2004 code, which stands for 'Intake Manifold Runner Stuck Open.' While the manifold runner valve is a common reason for this code, there are other potential culprits as well. A mechanical problem with the...

PO341 code - cruise control kicks off, engine light and vsa lights go on.

There could be an issue with the cruise control switch and the brake switch. The VSA light refers to the brake system and the light maybe coming on for the brake switch not functioning properly causing the cruise control switch...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com