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On-board diagnostic trouble codes are designed to help you or your mechanic diagnose issues with your vehicle faster. But before fixing the trouble codes retrieved by your scan tool, it’s crucial that you first understand what they mean.

Code P050D is a generic trouble code related to a rough engine idle during cold start. Read on to learn more about this error code, and what it can mean for your vehicle.

What Does the P050D Code Mean?

male holding a diagnostic tool use for checking car obd codes
Code P050D is a generic trouble code related to a rough engine idle during cold start.

Diagnostic trouble code (DTC) P050D stands for “Cold Start Rough Idle.”

The PCM monitors your engine’s RPM using signals from the (CKP) crankshaft position sensor and the camshaft position (CMP). It’s crucial to regulate intake airflow during closed throttle conditions. When idling, the PCM regulates air intake using the idle air control (IAC) valve. Unregulated air intake can cause rough engine idle at cold start and trigger the P050D error code.

It’s important to note that if your scan tool also retrieved lean exhaust codes, engine coolant temperature (ECT) codes, or IAC-related codes, then you should fix those issues first before the P050D trouble code. Engine misfire problems should also be resolved first because they can contribute to rough idle conditions during cold starts.

checking car engine for cause of misfire
Engine misfire problems should also be resolved first because they can contribute to rough idle conditions during cold starts.

Note: The definition of code P050D might be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What Are the Common Causes of the P050D Code?

What Are the Common Symptoms of the P050D Code?

  • Rich/lean exhaust
  • Cold start drivability problems
  • Other drivability issues
  • Hissing or sucking noise from the engine

How to Diagnose the P050D Code

The P050D is a generic code that can be logged across several makes and models. However, this does not mean there’s a universal diagnostic procedure that will work for all vehicles. The steps for troubleshooting this code will vary depending on your vehicle’s specifications.

Check out this video to get an idea of what the diagnostic process for this code might involve:

How to Fix the P050D Code

The symptoms of code P050D can be similar across several vehicles. However, that does not mean that they share repair steps as well. All vehicles are different, so make sure to refer to a factory repair guide that is specific to your car. For instance, repair steps for a P050D code in a Chevrolet Silverado might not work for a P050D code in a Chrysler 300.

If you’d like to troubleshoot this code on your own, make sure to consult a vehicle-specific repair manual or an online repair database. If you’re not an experienced auto DIYer, we strongly suggest leaving the job to a trusted professional.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic.

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