AutoCodes – GMC – P020F GMC

P020F GMC Code - Cylinder 6 Injection Timing

Quick Answer

The Engine Control Module (ECM) has the ability to learn injector timing performance. Common causes include Faulty Fuel Injector 6, Fuel Injector 6 harness is open or shorted, Fuel Injector 6 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: P020F GMC indicates Cylinder 6 Injection Timing.
Common causes: Common causes include Faulty Fuel Injector 6, Fuel Injector 6 harness is open or shorted, Fuel Injector 6 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 301

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 P020F GMC 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 P020F GMC - Cylinder 6 Injection Timing - AutoCodes.com — P020F GMC Code - Cylinder 6 Injection Timing

What does this mean?

What are the Possible Causes of the DTC P020F GMC?

Faulty Fuel Injector 6
Fuel Injector 6 harness is open or shorted
Fuel Injector 6 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P020F 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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P020F 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.

Need more information about the P020F GMC code?

Need more information on how to fix the P020F GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P020F GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P020F 2014 GMC Sierra — Cylinder 6 Injection Timing
P020F 2015 GMC Sierra — Cylinder 6 Injection Timing
P020F 2016 GMC Sierra — Cylinder 6 Injection Timing
P020F 2017 GMC Sierra — Cylinder 6 Injection Timing
P020F 2018 GMC Sierra — Cylinder 6 Injection Timing

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 P020F GMC Code

1. What does the OBDII code P020F mean for a GMC vehicle?

The P020F code indicates a problem with the injection timing for cylinder 6, which means the fuel injector isn't operating at the correct time.

2. What are the common symptoms of code P020F in a GMC?

Symptoms may include rough idling, reduced engine performance, increased fuel consumption, engine misfires, or the check engine light turning on.

3. What causes the P020F code to appear in a GMC?

Common causes include a faulty fuel injector, wiring or connector issues, a malfunctioning engine control module (ECM), or low fuel pressure.

4. Can I still drive my GMC with a P020F code?

While the vehicle may still be drivable, ignoring the issue can lead to reduced performance and potential engine damage. It's best to address the problem promptly.

5. How is the P020F code diagnosed in a GMC?

A technician will use a scan tool to check the code, inspect the fuel injector and wiring for cylinder 6, and test the ECM and fuel system.

6. How do I fix the P020F code on my GMC?

Repairs may include replacing the fuel injector for cylinder 6, repairing damaged wiring or connectors, cleaning clogged injectors, or updating/replacing the ECM.

7. Can a clogged fuel injector cause the P020F code?

Yes, a clogged or restricted fuel injector can disrupt the timing and trigger the P020F code.

8. How much does it cost to fix the P020F code on a GMC?

Repair costs vary but typically range from $150 to $500 depending on whether the injector, wiring, or ECM needs to be repaired or replaced.

9. Can a weak fuel pump cause the P020F code?

Yes, a weak or failing fuel pump can lead to low fuel pressure, which may contribute to injection timing issues.

10. Will clearing the P020F code solve the problem?

Clearing the code without addressing the root cause will only temporarily hide the issue, and the code is likely to return.

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