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Technical Description of OBD-II Trouble Code
Performance Issue with Intake Manifold Tuning Valve in Bank 1
What does that signify?
This is a generic diagnostic trouble code (DTC) that applies to OBD-II vehicles. It can be found in various vehicle makes such as Saturn, Land Rover, Porsche, Vauxhall, Dodge, Chrysler, Mazda, Mitsubishi, Chevy, Honda, Acura, Isuzu, Ford, etc.
The Engine Control Module (ECM) is responsible for monitoring and adjusting multiple sensors and systems in your vehicle. It also detects faults within these systems and circuits. One of the systems that the ECM monitors and correlates with desired values is the Intake Manifold Tuning Valve.
This valve is often referred to as a “flapper” valve in the repair world. It serves multiple purposes to enhance your engine’s performance and drivability. One purpose is to regulate pressures between intake plenums. Another purpose may be to redirect intake air to a separate set of intake runners, thereby altering the flow and potentially the performance of your engine. The valve is primarily made of plastic, which can lead to malfunctions due to the high temperatures in the engine compartment.
The trouble code P065E is identified as “Intake Manifold Tuning Valve Performance Bank 1.” It indicates a performance fault detected by the ECM on bank #1. In engines with multiple banks (e.g. V6, V8), bank #1 refers to the side of the engine that contains cylinder #1.
This code can be triggered by either a mechanical or electrical issue with the intake manifold tuning valve. In areas with extreme cold weather, the valve may malfunction and fail to rotate smoothly according to the ECM’s instructions.
A GM intake manifold tuning valve:
What is the severity of this DTC?
Depending on the specific problem in your case, the severity can range from nothing to worry about to something quite severe that could potentially damage your engine’s internals. It is advisable to err on the side of caution when dealing with mechanical parts like the intake manifold tuning valve. There is a possibility of unwanted parts entering the engine’s combustion chamber, so it’s important to keep that in mind and not postpone addressing the issue.
What are some of the symptoms of the code?
Symptoms associated with the P065E diagnostic code may include:
What are some of the common causes of the code?
Possible causes for this P065E engine code include:
What are some P065E diagnostic and troubleshooting steps?
The first step in troubleshooting any malfunction is to research the Technical Service Bulletins (TSB) for known issues with your specific vehicle.
Advanced diagnostic steps are highly vehicle-specific and may require specialized equipment and knowledge for accurate performance. The following basic steps are provided, but it is recommended to refer to a vehicle year/make/model/powertrain specific repair guide for precise steps applicable to your vehicle.
Basic Step #1
As a DIYer, it’s a good idea to clear all the codes activated by the ECM to see if they immediately reappear. If not, take the vehicle on long and numerous test drives to observe if the codes become active again after a few duty cycles. If they do reactivate, proceed with diagnosing the active code(s).
Basic Step #2
Begin by locating the intake manifold tuning valve. This may be challenging as it is often mounted internally within the intake manifold itself. However, the valve’s connector should be fairly accessible, so visually inspect it for any broken tabs, melted plastic, etc., to ensure it is making a proper electrical connection.
Basic Step #3
If your OBD2 code reader/scan tool allows it, try operating the valve electronically using the tool. This can help determine if the valve is functioning within its full range. Additionally, if you hear abnormal clicking noises from the intake while adjusting the sensor with your scanner, there is a possibility of an obstruction or a stuck valve. At this point, it would be wise to remove the valve and physically inspect it, as well as the inside of the intake manifold, for any obstructions. If no obstructions are found and the clicking persists, replacing the valve is likely the solution. However, keep in mind that this task may not be easy, so it is important to conduct thorough research beforehand to avoid being stranded without the necessary parts and tools.
NOTE: Always consult the manufacturer’s technical data before performing any repairs or diagnostics on your vehicle.
Basic Step #4
Do not forget to inspect the wiring harness associated with the tuning valve. These harnesses can be routed through engine parts and other areas with high heat. Additionally, engine vibrations can cause chafing and cracking in the wiring, so it is crucial to check for any potential issues.
Basic Step #5
If all other steps have been attempted without success, examine the Engine Control Module (ECM), especially if multiple unrelated codes are currently active or intermittently appearing and disappearing.
This article is intended solely for informational purposes, and it is always essential to prioritize the technical data and service bulletins provided by the manufacturer for your specific vehicle.
Professional Service
While we always recommend seeking professional mechanical assistance to resolve this issue, if that is not possible, we offer the option to permanently delete this specific DTC. All other codes will continue to be addressed. If you are interested in this option, please upload your ECU file to our portal.
