P0665 code definition
The P0665 trouble code notes an electrical malfunction with the intake manifold tuning valve control circuit in engine bank 2
What the P0665 code means
The P0665 code is a standard OBD-II trouble code that detects an error with the intake manifold tuning valve control circuit in engine bank 2. Bank 2 is the engine bank that opposes the number 1 cylinder. The intake manifold tuning valve control circuit is constantly monitored by the powertrain control module (PCM), the fuel injection control module, the transmission control module, and numerous other control modules. If any of these modules detects an abnormal reading from the intake manifold tuning valve control circuit, or is unable to receive a reading from the circuit, then the P0665 trouble code will be stored.
What causes the P0665 code?
Potential causes of the P0665 trouble code are:
- Defective PCM driver
- Loose control module ground strap
- Broken control module ground wire
- Faulty fuel injector control module
- In rare cases, a malfunctioning PCM or CAN bus
- Damaged electrical components in the PCM or the controller area network (CAN) bus
What are the symptoms of the P0665 code?
The P0665 code is generally accompanied by the Check Engine Light, which will illuminate on the dashboard. It is likely that engine and transmission performance problems will be present, namely rough idling, hesitant or slow acceleration, and constant stalling at idle. It is common for the vehicle to also experience reduced fuel efficiency.
How does a mechanic diagnose the P0665 code?
The P0665 code will be diagnosed with an OBD-II trouble code scanner. A trustworthy mechanic will assess the code by viewing the freeze frame data from the scanner. The mechanic will also use the scanner to check for the presence of other trouble codes. If multiple trouble codes are presented, then they will need to be inspected and repaired in the order in which they are displayed. The mechanic will then reset the trouble codes and restart the vehicle, to see if the P0664 code remains detected. If it does not, then an incorrect trigger or an intermittent issue are likely to blame.
If the code does return following the reset, then the technician will visually inspect all of the electrical components in the PCM and CAN bus systems, and replace any wires, fuses, and connectors that are short, blown, open, or damaged. The ground strap and ground wire will then require inspection. If the problem is unsolved, then a specialized CAN scanner can be used to gain insight into the control modules, which will help the mechanic identify the issue.
Any time the mechanic replaces a component, then the trouble codes will need to again be reset, the vehicle again restarted, and the code once more checked for. This helps the technician know when the P0665 code has been resolved.
Common mistakes when diagnosing the P0665 code
The most frequently made mistake when diagnosing this code comes from a failure to follow the OBD-II diagnosis protocol. Mechanics should abide by the protocol step by step, to guarantee a diagnosis and repair that is efficient and accurate.
It is common for the P0665 code to be joined by numerous other trouble codes, many or all of which may be the result of a communication error left by the P0665 code. These codes are sometimes erroneously diagnosed and repaired before the P0665 code is, despite showing up later on the scanner.
How serious is the P0665 code?
The P0665 trouble code will not keep a car from being drivable, though there will likely be noticeable drivability issues, and possibly frequent stalling. Because of this, the vehicle should be inspected and repaired as quickly as possible.
What repairs can fix the P0665 code?
Potential repairs for the P0665 trouble code are:
- Updating the PCM drivers
- Reprogramming the PCM
- Replacement of ground straps and ground wires
- Replacement of wires, fuses, and connectors
- Replacement of the fuel injector control module
- In very rare cases, replacement of the PCM or CAN bus
Additional comments for consideration regarding the P0665 code
The P0665 trouble code will very rarely be caused by a faulty PCM or CAN bus. All other potential options should be thoroughly exhausted before the mechanic assumes a defective PCM or CAN bus. If they do require replacement, then they will also need to be reprogrammed.
Need help with a P0665 code?
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