P050D GMC 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 GMC 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.
Code P050D GMC Description
What are the Possible Causes of the DTC P050D GMC?
- Faulty Fuel Injector
- Fuel Injector harness is open or shorted
- Fuel Injector circuit poor electrical connection
How to Fix the DTC P050D GMC?
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.
Code Tech Notes
2014-2018 GMC Sierra 1500
2015-2018 GMC Yukon
Condition: A vehicle may have a concern with a DTC P050D setting along with a P0300 after a cold start-up. White smoke and/or coolant odor may come from 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 GMC 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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Information for Specific GMC Models
- P050D 2014 GMC Sierra — Cold Start Rough Idle
- P050D 2015 GMC Sierra — Cold Start Rough Idle
- P050D 2016 GMC Sierra — Cold Start Rough Idle
- P050D 2017 GMC Sierra — Cold Start Rough Idle
- P050D 2018 GMC Sierra — Cold Start Rough Idle
Frequently Asked Questions about P050D GMC Code
1. What are the common symptoms of OBDII code P050D GMC (Cold Start Rough Idle)?
Symptoms of this code may include rough idle during cold starts, hesitation or stalling when accelerating, and decreased fuel efficiency.
2. What are the possible causes of OBDII code P050D GMC?
Common causes of this code include a faulty mass airflow sensor (MAF), issues with the engine coolant temperature sensor, vacuum leaks, or a dirty throttle body.
3. How can I diagnose the cause of OBDII code P050D GMC?
To diagnose the issue, you can perform a visual inspection for vacuum leaks, test the MAF sensor, check the engine coolant temperature sensor, and clean the throttle body.
4. Can a dirty throttle body cause OBDII code P050D GMC?
Yes, a dirty throttle body can disrupt the proper air-fuel mixture, leading to a rough idle during cold starts and triggering the P050D code.
5. How can I repair OBDII code P050D GMC caused by a dirty throttle body?
Cleaning the throttle body using a throttle body cleaner can help remove carbon buildup and dirt, improving airflow and potentially resolving the rough idle issue.
6. Is it safe to drive with OBDII code P050D GMC present?
While you may still be able to drive the vehicle with this code, it is recommended to address the underlying issue promptly to prevent potential damage to the engine over time.
7. Can a faulty engine coolant temperature sensor trigger OBDII code P050D GMC?
Yes, a faulty engine coolant temperature sensor can disrupt the engine's fuel mixture control, leading to a rough idle during cold starts and triggering the P050D code.
8. How can I test the engine coolant temperature sensor for issues related to OBDII code P050D GMC?
You can use a multimeter to test the sensor's resistance or voltage values according to the manufacturer's specifications to determine if it is functioning correctly.
9. Are there any DIY repair tips for addressing OBDII code P050D GMC at home?
DIY repair tips include checking and cleaning the throttle body, inspecting vacuum lines for leaks, testing the MAF sensor, and ensuring the engine coolant temperature sensor is working properly.
10. Should I reset the OBDII code P050D GMC after making repairs?
Yes, after repairing or addressing the underlying issue causing the P050D code, it is recommended to clear the code using an OBDII scanner to reset the vehicle's system and monitor for any reoccurrence.
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