AutoCodes – GMC – P050D 2016 GMC Sierra

P050D 2016 GMC Sierra Code - Cold Start Rough Idle

Quick Answer

During a cold start, the Engine Control Module (ECM) commands dual-pulse mode during Open Loop operation to improve cold start emissions. Common causes include Faulty Fuel Injector, Fuel Injector harness is open or shorted, Fuel Injector circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P050D 2016 GMC Sierra indicates Cold Start Rough Idle.
Common causes: Common causes include Faulty Fuel Injector, Fuel Injector harness is open or shorted, Fuel Injector circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 386

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jul 23, 2022

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P050D 2016 GMC Sierra Description

During a cold start, the Engine Control Module (ECM) commands dual-pulse mode during Open Loop operation to improve cold start emissions. In dual-pulse mode, the fuel injectors are energized twice during each injection event. As with misfire diagnosis, in dual-pulse mode the ECM monitors the crankshaft position sensor and the camshaft position sensor to calculate crankshaft rotation speed. In normal operation, optimum fuel delivery during dual-pulse mode produces a steady crankshaft rotation speed. If the variations exceed a calibrated value, the code will be set.

OBDII Code P050D 2016 GMC Sierra - Cold Start Rough Idle - AutoCodes.com — P050D 2016 GMC Sierra Code - Cold Start Rough Idle

What does this mean?

What are the Possible Causes of the DTC P050D 2016 GMC Sierra?

Faulty Fuel Injector
Fuel Injector harness is open or shorted
Fuel Injector circuit poor electrical connection

How to Fix the DTC P050D 2016 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

There is a factory service bulletin for the following Chevrolet models:
2014-2018 Chevrolet Silverado 1500
Condition: A vehicle may have a concern about a DTC P050D setting along with a P0300 after a cold startup. White smoke and/or coolant odor may come from the exhaust for an extended period of time at a cold start as well. It may also Run rough when warm, with a slight knock, no codes set.
Cause: Coolant getting into the cylinders. If there is coolant in the cylinder, the cylinder head will need to be replaced.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P050D 2016 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P050D 2016 GMC Sierra Code

1. What does the OBDII code P050D mean for a 2016 GMC Sierra?

P050D indicates "Cold Start Rough Idle," meaning the engine is experiencing rough idling during cold starts, often due to incomplete combustion or air/fuel mixture issues.

2. What are the common symptoms of code P050D in a 2016 GMC Sierra?

Symptoms include rough idling when the engine is cold, poor fuel economy, possible engine misfires, and an illuminated check engine light.

3. What causes P050D on a 2016 GMC Sierra?

Common causes include faulty spark plugs, dirty or failing fuel injectors, vacuum leaks, low fuel pressure, or carbon buildup on intake valves.

4. Can a dirty fuel injector cause the P050D code?

Yes, dirty or clogged fuel injectors can disrupt the proper air/fuel mixture, leading to rough idling during cold starts.

5. How do you fix the P050D code on a 2016 GMC Sierra?

Repairs may include replacing spark plugs, cleaning or replacing fuel injectors, inspecting and fixing vacuum leaks, or performing an intake valve cleaning.

6. Can a vacuum leak cause a cold start rough idle?

Yes, a vacuum leak can cause an imbalance in the air/fuel mixture, leading to a rough idle when the engine is cold.

7. Is it safe to drive a 2016 GMC Sierra with the P050D code?

It is generally safe to drive short distances, but prolonged driving with this issue can lead to engine damage or reduced fuel efficiency.

8. How much does it cost to repair the P050D code?

Repair costs vary but typically range from $150 to $500, depending on whether spark plugs, fuel injectors, or other components need replacement.

9. Can a software update fix the P050D code on a 2016 GMC Sierra?

In some cases, a PCM (Powertrain Control Module) software update may resolve the issue if the code is related to a calibration problem.

10. How can I prevent the P050D code from reoccurring?

Regular maintenance, such as replacing spark plugs on schedule, using quality fuel, and cleaning fuel injectors, can help prevent this code from reoccurring.