AutoCodes – GMC – P020B 2018 GMC Sierra

P020B 2018 GMC Sierra Code - Cylinder 2 Injection Timing

Quick Answer

The Engine Control Module (ECM) has the ability to learn injector timing performance. Common causes include Faulty Fuel Injector 2, Fuel Injector 2 harness is open or shorted, Fuel Injector 2 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: P020B 2018 GMC Sierra indicates Cylinder 2 Injection Timing.
Common causes: Common causes include Faulty Fuel Injector 2, Fuel Injector 2 harness is open or shorted, Fuel Injector 2 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 189

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
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Code P020B 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 P020B 2018 GMC Sierra - Cylinder 2 Injection Timing - AutoCodes.com — P020B 2018 GMC Sierra Code - Cylinder 2 Injection Timing

What does this mean?

What are the Possible Causes of the DTC P020B 2018 GMC Sierra?

Faulty Fuel Injector 2
Fuel Injector 2 harness is open or shorted
Fuel Injector 2 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P020B 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 P020B 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 P020B 2018 GMC Sierra code?

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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 P020B 2018 GMC Sierra Code

1. What is OBDII code P020B for a 2018 GMC Sierra related to Cylinder 2 Injection Timing?

The P020B code indicates an issue with the injection timing for cylinder 2 in the fuel system of the GMC Sierra.

2. What are common symptoms of OBDII code P020B in a 2018 GMC Sierra?

Common symptoms of code P020B may include engine misfires, rough idling, decreased fuel efficiency, and potential engine stalling.

3. What are possible causes of OBDII code P020B in a 2018 GMC Sierra?

Potential causes of code P020B include faulty fuel injector for cylinder 2, wiring issues, poor electrical connections, or issues with the Engine Control Module (ECM).

4. How can I diagnose OBDII code P020B in a 2018 GMC Sierra?

Diagnosing code P020B may involve using a scan tool to check for the specific cylinder 2 injection timing issue, inspecting the fuel injector and related components, and testing the wiring and connections.

5. Can I drive my 2018 GMC Sierra with OBDII code P020B?

It is not recommended to drive your GMC Sierra with code P020B, as it can lead to further engine damage and potential safety hazards. It's best to address the issue promptly.

6. How can I repair OBDII code P020B in a 2018 GMC Sierra?

Repairing code P020B may involve replacing the fuel injector for cylinder 2, repairing wiring or connections, or reprogramming the Engine Control Module (ECM) to address the injection timing issue.

7. Are there any DIY tips for fixing OBDII code P020B in a 2018 GMC Sierra?

While some basic troubleshooting like checking connections and visually inspecting the fuel injector can be done DIY, it's recommended to consult a professional mechanic for proper diagnosis and repair.

8. Can a faulty fuel pump cause OBDII code P020B in a 2018 GMC Sierra?

While a faulty fuel pump may not directly trigger code P020B, it can impact fuel delivery and potentially lead to injection timing issues in specific cylinders, including cylinder 2.

9. How much does it cost to fix OBDII code P020B in a 2018 GMC Sierra?

The cost of fixing code P020B can vary depending on the exact cause of the issue, parts needed for repair, and labor costs. It's advisable to get a diagnostic from a mechanic for an accurate estimate.

10. Will resetting the ECM clear OBDII code P020B in a 2018 GMC Sierra?

Resetting the ECM may temporarily clear the code, but if the underlying issue causing code P020B is not addressed, the code is likely to reappear. It's crucial to diagnose and fix the root cause of the problem.