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Summary
  • DTC P050A stands for “Cold Start Idle Control System Performance,” and it’s logged when the PCM can’t control the engine’s RPM.
  • Clogged air filters, faulty mass airflow sensors, and wiring issues are some of the problems that can trigger this trouble code.
  • Common symptoms of P050A include high or low engine RPM, a stalling engine, and issues starting the engine.

Did a P050A diagnostic trouble code (DTC) register on your scan tool? Read this article to find out what it means, its common causes and symptoms, and the best way to approach the issue.

What Does the P050A Code Mean? 

Diagnostic trouble code (DTC) P050A stands for Cold Start Idle Control System Performance. When you start your engine, your vehicle’s catalytic converter needs to warm up for it to reduce emissions. Your engine’s powertrain control module (PCM) tries to heat it up faster by increasing the idle speed. It does this by letting the idle air control (IAC) valve let in more air.

See also  P0506: Idle Air Control System RPM Lower Than Expected

The PCM targets the desired engine RPM and tries to achieve it by allowing the IAC to either increase or decrease the amount of airflow, depending on the RPM detected by the PCM. The P050A can trigger when the PCM cannot effectively control the engine RPM using the IAC. It can also trigger if the PCM detects that the right amount of air isn’t entering the engine during the warm-up procedure.

Here’s how Ford describes P050A: This DTC sets when the difference between desired and actual engine speed exceeds the calibrated threshold.

testing criteria the pcm uses before setting code p050a lexus
Lexus provides this graph explaining the testing criteria the PCM uses before setting code P050A. | Image Source: Richard McCuistian.

What are the Possible Causes of the P050A Code? 

Several issues can cause the P050A code to trigger. These include: 

What are the Possible Symptoms of a P050A Code? 

If the P050A code is triggered, then your vehicle will show symptoms like: 

  • High or low engine RPM
  • Engine stalling
  • Starting issues 
  • Tapping or popping noises from the IAC valve
  • Decreased engine performance 
  • Increased fuel consumption  
dirty car air filter
A clogged air filter can cause the P050A code to set.

How to Diagnose the P050A Code

There could be several possible issues that can cause a P050A code. Identifying the cause can be difficult if you’re unfamiliar with your vehicle’s internal components. You might need to disassemble several components with special tools and you likely need some training to get the job done properly. If you’re not familiar with doing DIY repairs, then you should consult a trusted mechanic. 

See also  P0505 Code: Idle Control System

The video below might give you an idea of the diagnostic process: 

How to Fix the P050A Code 

Unfortunately, there aren’t any simple, fix-all solutions to OBD-II trouble codes. Repair procedures can vary greatly depending on the vehicle model and affected parts. If you don’t have much experience troubleshooting DTCs, then it might be best to leave the task to a trusted professional. 

However, if you’re confident in doing DIY repairs on your vehicle, then you need to properly diagnose the issue first. After identifying the cause of the P050A code, then you can start consulting online repair resources and guides for possible fixes. 

Getting an ALLDATA single-vehicle subscription can also be beneficial, as it provides detailed factory repair information for drivers who want to do repairs themselves.

Where to Get a High-Quality Air Filter

No matter what other people say, you should never, ever ignore a clogged air filter. Not only will it trigger the P050A code, it can also damage your vehicle’s spark plugs, reduce engine performance, and lead to increased emissions. The worst part is that it can also damage your engine in the long run. Luckily, you can easily prevent all these issues by getting a brand-new air filter from CarParts.com.

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At CarParts.com, you can find a wide selection of high-quality air filters at different price points. We’re committed to helping you save on the parts you need while making sure you get the best deal every single time. Because of this, we offer a price match guarantee. If you find a competitor advertising the product at a lower price, just let us know and we’ll match or beat that price on the spot! Don’t hesitate to reach out to our customer support staff if you need any help.

Don’t wait until your dirty air filter damages your engine before replacing it. Check out our selection of high-quality air filters at CarParts.com and get one for your vehicle today!

About The Authors
Written By Automotive and Tech Writers

The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by CarParts.com's thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.

Reviewed By Technical Reviewer at CarParts.com

Richard McCuistian has worked for nearly 50 years in the automotive field as a professional technician, an instructor, and a freelance automotive writer for Motor Age, ACtion magazine, Power Stroke Registry, and others. Richard is ASE certified for more than 30 years in 10 categories, including L1 Advanced Engine Performance and Light Vehicle Diesel.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.

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