AutoCodes – GMC – P020C 2017 GMC Sierra

P020C 2017 GMC Sierra Code - Cylinder 3 Injection Timing

Quick Answer

The Engine Control Module (ECM) has the ability to learn injector timing performance. Common causes include Faulty Fuel Injector 3, Fuel Injector 3 harness is open or shorted, Fuel Injector 3 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: P020C 2017 GMC Sierra indicates Cylinder 3 Injection Timing.
Common causes: Common causes include Faulty Fuel Injector 3, Fuel Injector 3 harness is open or shorted, Fuel Injector 3 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 181

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 P020C 2017 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 P020C 2017 GMC Sierra - Cylinder 3 Injection Timing - AutoCodes.com — P020C 2017 GMC Sierra Code - Cylinder 3 Injection Timing

What does this mean?

What are the Possible Causes of the DTC P020C 2017 GMC Sierra?

Faulty Fuel Injector 3
Fuel Injector 3 harness is open or shorted
Fuel Injector 3 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P020C 2017 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 P020C 2017 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 P020C 2017 GMC Sierra code?

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Need Help with the 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 P020C 2017 GMC Sierra Code

1. What does OBDII code P020C mean on a 2017 GMC Sierra?

Code P020C indicates an issue with the injection timing for Cylinder 3, specifically suggesting a timing delay or improper signal between the engine control module (ECM) and the fuel injector.

2. What are the common symptoms of code P020C in a 2017 GMC Sierra?

Symptoms may include rough idling, reduced engine performance, poor fuel economy, hesitation during acceleration, or the check engine light turning on.

3. What causes P020C to appear in a 2017 GMC Sierra?

Common causes include a faulty fuel injector, wiring issues in the injector circuit, a malfunctioning ECM, or a problem with the fuel injector driver.

4. Can I drive my 2017 GMC Sierra with a P020C code?

While the vehicle may still run, driving with this code can lead to reduced performance, potential engine damage, or further complications. Itâ€™s best to address the issue promptly.

5. How is the P020C code diagnosed?

A mechanic will typically inspect the fuel injector and its wiring for damage, test the injectorâ€™s resistance, check for proper voltage at the injector connector, and verify signals from the ECM.

6. Is a faulty fuel injector the only cause of P020C?

No, other causes could include corroded or damaged wiring, a bad ECM, or poor electrical connections in the fuel injector circuit.

7. How much does it cost to fix a P020C code on a 2017 GMC Sierra?

Repair costs can vary. Replacing a fuel injector might cost $200â€“$400, while fixing wiring or connections can range from $50â€“$200. ECM issues could be more expensive, often exceeding $1,000.

8. Can a dirty fuel injector cause P020C on a 2017 GMC Sierra?

Yes, a clogged or dirty fuel injector can disrupt the timing and fuel delivery to Cylinder 3, potentially triggering the P020C code.

9. What tools are needed to troubleshoot the P020C code?

A professional scan tool, a multimeter, and possibly an oscilloscope are typically used to diagnose and troubleshoot this code.

10. How can I prevent the P020C code from reoccurring?

Regular maintenance, including fuel system cleaning, inspecting and repairing wiring, and promptly addressing any injector issues, can help prevent this code.