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AutoCodes – GMC – P020B 2016 GMC Sierra

P020B 2016 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 2016 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 148
How popular is this code, among other codes? Low
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Table of contents Created and updated by William Orellana on Mar 22, 2024
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Code P020B 2016 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 2016 GMC Sierra - Cylinder 2 Injection Timing - AutoCodes.com
P020B 2016 GMC Sierra Code - Cylinder 2 Injection Timing
What does this mean?

What are the Possible Causes of the DTC P020B 2016 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 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P020B 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.

Need more information about the P020B 2016 GMC Sierra code?

Need more information on how to fix the P020B 2016 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P020B 2016 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 P020B 2016 GMC Sierra Code

1. What does the OBDII code P020B mean on a 2016 GMC Sierra?

P020B indicates a problem with the fuel injector timing for Cylinder 2, which can affect engine performance and efficiency.

2. What are the common symptoms of code P020B in a 2016 GMC Sierra?

Symptoms may include rough idling, reduced engine performance, poor fuel economy, misfires, or the Check Engine Light turning on.

3. What causes the P020B code to appear in a 2016 GMC Sierra?

Possible causes include a faulty fuel injector, damaged wiring or connectors for Cylinder 2, a malfunctioning Powertrain Control Module (PCM), or low fuel pressure.

4. Can I drive my 2016 GMC Sierra with a P020B code?

Driving with a P020B code is not recommended, as it can lead to further engine damage, increased emissions, and poor performance.

5. How do I diagnose the P020B code on a 2016 GMC Sierra?

Diagnosis involves using a scan tool to confirm the code, inspecting the wiring and connectors for Cylinder 2, checking the fuel injector, and testing the PCM for faults.

6. How do I fix the P020B code on my 2016 GMC Sierra?

Repairs may include replacing the faulty fuel injector, repairing damaged wiring or connectors, cleaning the injector, or reprogramming or replacing the PCM if necessary.

7. How much does it cost to repair a P020B code on a 2016 GMC Sierra?

Repair costs vary, but replacing a fuel injector typically costs $150–$350 for parts and labor, while PCM repairs can be more expensive, ranging from $500–$1,200.

8. Can a dirty fuel injector cause the P020B code on a 2016 GMC Sierra?

Yes, a dirty or clogged fuel injector can disrupt the timing and cause the P020B code to appear.

9. What tools are needed to troubleshoot the P020B code in a 2016 GMC Sierra?

You’ll need an OBDII scan tool, a multimeter to test electrical connections, and possibly a fuel pressure gauge to check the system.

10. Is the P020B code specific to GMC vehicles like the 2016 Sierra?

No, the P020B code is a generic OBDII code that can appear in other vehicles, but its diagnosis and repair steps may vary by make and model.

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