What the P0661 code means?
A P0661 code will be stored in the car's computer when the PCM or another control module notes that the voltage reading from the intake manifold tuning valve control circuit is lower than what it should be. This is monitored during both key on/engine off and key on/engine running self-tests, although it may take up to eight drive cycles for the code to set.
What causes the P0661 code?
Defective intake manifold tuning valve
Broken valve parts
Broken electrical connector
What are the symptoms of the P0661 code?
Symptoms may include drivability issues, decreased fuel economy, the engine may stall or run roughly at idle, poor acceleration, a stored trouble code, and possibly an illuminated service engine soon lamp. If this code is stored, and a service engine soon lamp has not yet been illuminated, the code may be shown as pending
Common mistakes when diagnosing the P0661 code:
Symptoms and stored codes that are present as a reaction to a communication failure are often misdiagnosed and repaired as the cause of the problem. Obviously, this leads to an unsuccessful repair. Engine misfire codes, lean exhaust codes, fuel injector codes, and virtually any other drivability or transmission code that is accompanied by a controller communication code can potentially be a pitfall for misdiagnosis. Follow the rule that says to diagnose codes in the order in which they are stored and you will improve your chances for a successful diagnosis. Utilize freeze frame data to help you determine which codes were stored first.
What repairs can fix the P0661 code?
The most common repairs for the P0661 code include the following:
1. Reinstalling the driver in the PCM
2. Replacing a failed intake manifold tuning valve
3. Repairing loose or corroded connections in the wiring for the intake manifold tuning valve