AutoCodes – GMC – P020A 2018 GMC Sierra

P020A 2018 GMC Sierra Code - Cylinder 1 Injection Timing

Quick Answer

The Engine Control Module (ECM) has the ability to learn injector timing performance. Common causes include Faulty Fuel Injector 1, Fuel Injector 1 harness is open or shorted, Fuel Injector 1 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: P020A 2018 GMC Sierra indicates Cylinder 1 Injection Timing.
Common causes: Common causes include Faulty Fuel Injector 1, Fuel Injector 1 harness is open or shorted, Fuel Injector 1 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 179

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 22, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P020A 2018 GMC Sierra Description

The Engine Control Module (ECM) has the ability to learn injector timing performance. When the engine is at operating temperature, throttle closed and in deceleration fuel cut-off mode, the ECM will pulse each injector individually and measure the changes in rotational speed of the crankshaft using the input from the crankshaft position sensor. The ECM will run this diagnostic at one fuel rail pressure operating point for each injector. The ECM stores the injector timing value. The Diagnostic Trouble Code (DTC) will be set when the time to build up sufficient current to open the injector is below or above a predetermined threshold.

OBDII Code P020A 2018 GMC Sierra - Cylinder 1 Injection Timing - AutoCodes.com — P020A 2018 GMC Sierra Code - Cylinder 1 Injection Timing

What does this mean?

What are the Possible Causes of the DTC P020A 2018 GMC Sierra?

Faulty Fuel Injector 1
Fuel Injector 1 harness is open or shorted
Fuel Injector 1 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P020A 2018 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P020A 2018 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.

Need more information about the P020A 2018 GMC Sierra code?

Need more information on how to fix the P020A 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P020A 2018 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 P020A 2018 GMC Sierra Code

1. What are common symptoms of OBDII code P020A in a 2018 GMC Sierra related to Cylinder 1 Injection Timing?

- Common symptoms include rough idling, decreased fuel efficiency, engine misfires, and potentially stalling.

2. What are the possible causes of OBDII code P020A in a 2018 GMC Sierra?

- Potential causes include a faulty fuel injector, wiring issues in the fuel injector circuit, ECM (Engine Control Module) problems, or fuel delivery issues.

3. How can I diagnose the issue causing OBDII code P020A on Cylinder 1 in a 2018 GMC Sierra?

- Diagnose by checking the fuel injector for proper operation, inspecting the wiring harness for any damage, and using a scan tool to monitor the ECM signals related to the fuel injector.

4. Can I still drive my 2018 GMC Sierra with OBDII code P020A related to Cylinder 1 Injection Timing?

- It is not recommended to drive the vehicle with this code as it can lead to further engine damage and potential safety hazards.

5. How should I repair OBDII code P020A in a 2018 GMC Sierra Cylinder 1 Injection Timing issue?

- Repair involves addressing the specific cause, which may include replacing the faulty fuel injector, repairing wiring issues, or reprogramming the ECM.

6. Is it possible to reset the OBDII code P020A in a 2018 GMC Sierra without fixing the underlying issue?

- While clearing the code may temporarily turn off the check engine light, it will not fix the root cause, and the issue is likely to return.

7. Can a DIY enthusiast fix OBDII code P020A related to Cylinder 1 Injection Timing in a 2018 GMC Sierra?

- Depending on the specific cause, some DIY enthusiasts may be able to address the issue themselves, such as replacing a faulty fuel injector. However, complex wiring or ECM problems may require professional assistance.

8. What are the long-term implications of ignoring OBDII code P020A in a 2018 GMC Sierra?

- Ignoring this code can lead to more severe engine problems, decreased performance, reduced fuel efficiency, and potential safety risks.

9. Are there any preventive maintenance tips to avoid OBDII code P020A in a 2018 GMC Sierra?

- Regularly servicing the fuel system, using high-quality fuel, and promptly addressing any engine performance issues can help prevent OBDII code P020A occurrences.

10. How long does it typically take to repair OBDII code P020A related to Cylinder 1 Injection Timing in a 2018 GMC Sierra?

- The repair time can vary depending on the exact cause of the issue, but it may take a few hours to a day for a professional technician to diagnose and fix the problem.