Q: Malfunction indicator lamp is on!

asked by on

Car hiccups when applying gas, does not shutdown but jerks forward when trying to accelerate! Dealership says computer gives P2647 code which means Oil Pressure Switch needs to be replaced! Does that make sense?

My car has 81000 miles.
My car has an automatic transmission.

Code P2647 stands for Rocker Arm Oil Pressure Switch Circuit High Voltage. This switch is part of the the variable valve timing (VETC) system. The powertrain control module (PCM) activates an oil control solenoid to charge/discharge the hydraulic circuit of the VTEC mechanism that adjusts the valve timing. Obviously, this system is dependent on oil pressure, which is why there is an oil pressure switch downstream of the oil control solenoid to keep the PCM apprised of system operation. If the PCM senses a difference in requested and actual oil pressure, it will turn on the check engine light and set code P2647. The problem could be the switch, but then again, it could be any part of this system. Even a low oil level can trigger this code. A problem in this system can also cause the engine performance problems you are having. I recommend having the experts at YourMechanic properly diagnose this issue for you (https://www.yourmechanic.com/services/check-engine-light-is-on-inspection).

Was this answer helpful?

Hi there:

Well, the dealership is partially correct here. The P2647 OBD-II trouble code indicates that the powertrain control module has detected a malfunction in the intake camshaft rocker arm actuator system (A). This code is usually found in vehicles that have variable valve timing; like your 2007 Honda Accord. Repairs that can resolve the issues that are caused by this trouble code would include, adding or changing the engine oil, replacing the timing belt or chain as well as other timing components, replacing the oil control valve or other variable valve timing components, repairing or replacing wiring or connectors that are associated with the variable valve timing system or in extreme cases; replacing the powertrain control module. If you’d like a second opinion about what needs to be replaced, you can have one of our professional mechanics complete a check engine light inspection; and determine if the oil pressure switch is the faulty component that needs to be replaced.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Malfunction indicator lamp is on!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Loud rattling from power steering pump

From the symptoms you describe on your Kia and the leaking you are observing, it sounds like the power steering pump is failing internally. This is due to running low on power steering fluid. The power steering pump plays an...

Q: Q: AC not working and car overheating.

The AC and cooling are two separate systems, so these are likely two separate issues. That is unless, your serpentine belt is misadjusted or broken. Both the AC and water pump are driven off this belt. A trained technician, like...

Q: Q: Engine vibration

Unfortunately there are many different reasons that could cause your Honda Civic to experience engine vibration. These include but are not limited to worn out suspension, defective tires or even weak or broken engine mounts could all lead to your...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.