What Codes Will This Page Cover?
On this page, you’ll learn more about the following two diagnostic trouble codes:
- P0661 Intake Manifold Tuning Valve Control Circuit Low
- P0662 Intake Manifold Tuning Valve Control Circuit High
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What Is the P0661 Code?
Symptoms
Causes
Seriousness
Can I Still Drive?
Diagnose
Difficulty of Inspecting
Get Additional Help
The P0661 and P0662 codes have to do with your manifold tuning valve, which is a component of the vehicle that helps with your overall performance and drivability. This valve essentially varies the length of the intake manifold runners, which changes the engine output by redirecting intake air. If your powertrain control module (PCM) or engine control module (ECM) receives a circuit reading from the manifold tuning valve that is either too low, in the case of code P0661, or too high, in the case of code P0662, it will return this code.
You may also be interested in P0660 Intake Manifold Tuning Valve Control Circuit/Open.
What Are the Symptoms of a P0661 Code?
As with many error codes, the first symptom you’ll likely see of the P0661 and P0662 codes is the check engine light or other malfunction indicator light turning on. However, there are many other possible symptoms. You may see general decreased engine power and poor engine performance, as well as poor fuel economy. A loud clicking noise may come from the engine bay, and cold start issues happen occasionally, including possible misfiring on startup. Whether you only see the check engine light turn on or you’re experiencing other severe symptoms, it’s important to take the light seriously and try to fix it as soon as possible.
What Are Some Causes of a P0661 Code?
The P0661 and P0662 codes are often symptom codes and not cause codes, which means that they indicate an issue related to a core cause rather than that cause itself. Here are a few of the causes that you might see for the P0661 and P0662 codes:
- Broken valve parts and electrical connectors
- Stuck valve
- Valve contamination
- Failed intake manifold runner valve position sensor
- Electrical issues, including wiring harnesses
- PCM issues, although this is uncommon
How Serious Is the P0661 Code?
You should definitely treat the P0661 and P0662 codes as being quite serious. One of the biggest reasons to treat these codes this way is that it’s difficult to determine code severity before diagnosing the problem. This trouble code could be a misfire code, creating potential harm to your engine compartment, or it could just be a malfunctioning sensor requiring only a quick sensor replacement. You won’t know until you get the full information about the issue. It’s always best to err on the side of caution when it comes to high engine speeds and general drivability issues.
Can I Still Drive with a P0661 Code?
In general, experts suggest that you should avoid driving with the P0661 and P0662 codes active. Even if the issue seems fairly minor, like a poor connection between certain electrical sensors, engine vibration can quickly cause these problems to worsen and potentially leave you stranded on the side of the road. Regardless of how severe these codes seem at first, it’s always a good idea to talk to an expert and figure out the actual cause so you can fix it and ensure that there are no repercussions from the initial problem.
How Easy Is It to Diagnose a P0661 Code?
Diagnosing the P0661 and P0662 codes is notably quite difficult. Just about anything could be wrong—you could even have issues with your vacuum lines, such as a vacuum leak, that could eventually result in these codes. It’s hard to be completely certain what the issue is until you can get in and check through diagnostic flowcharts to determine the core problem. You’ll need to check all other DTCs (diagnostic trouble codes) before trying to solve this problem, often by checking the earliest code on your code scanner. Most DIYers aren’t built for this process, so it’s best to direct questions, including emergency questions surrounding your vehicle’s function, to highly rated, verified experts.
How Difficult Is It to Inspect a P0661 Code?
Inspection can be just as difficult for the P0661 and P0662 codes as diagnosis. The diagnostic steps can be tricky to figure out, but getting into the engine and determining exactly what you need to look at and how to do it safely is also difficult. You’ll need to know your way around your vehicle quite well in order to inspect the code effectively. No matter what you’re looking for and why, it’s often best to rely on the qualifications of experts to avoid potentially damaging your car during the inspection.
Need Additional Help with Your P0661 Code?
If you need extra help with your P0661 and P0662 codes, you’re in the right place. There are plenty of experts out there who will be more than happy to look at your vehicle and figure out exactly what you need to do to fix it.
To get started, you should first find an auto repair shop in your area. A local auto repair shop is a great place to get knowledgeable information about what’s going on in your vehicle, and it also means you won’t have to go too far out of your way to get that assistance.
Finally, make sure you check out the OBD-II database at KBB.com to get a better understanding of any codes that you might see with your code scanner. This can help you learn more about codes before you talk to an expert, so you’ll understand more about what problems you might be seeing in your vehicle when the expert takes a look.
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