AutoCodes – GMC – P020C GMC

P020C GMC 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 GMC 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 358

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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

What does this mean?

What are the Possible Causes of the DTC P020C GMC?

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 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 P020C 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 P020C GMC code?

Need more information on how to fix the P020C GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P020C GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P020C 2014 GMC Sierra — Cylinder 3 Injection Timing
P020C 2015 GMC Sierra — Cylinder 3 Injection Timing
P020C 2016 GMC Sierra — Cylinder 3 Injection Timing
P020C 2017 GMC Sierra — Cylinder 3 Injection Timing
P020C 2018 GMC Sierra — Cylinder 3 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 P020C GMC Code

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

P020C indicates an issue with the injection timing of cylinder 3, often caused by a fault in the fuel injector circuit or a timing misalignment.

2. What are the common symptoms of the P020C code?

Symptoms may include engine misfires, reduced power, poor fuel efficiency, rough idling, and the Check Engine Light being illuminated.

3. What causes the P020C code on a GMC vehicle?

Common causes include a faulty fuel injector, damaged wiring or connectors in the injector circuit, a failing ECM, or timing issues in the fuel delivery system.

4. Can I continue driving with the P020C code on my GMC?

Itâ€™s not recommended to drive for extended periods with this code active, as it can lead to engine damage, reduced performance, and poor fuel economy.

5. How do I diagnose the P020C code on a GMC?

Start by inspecting the wiring and connectors for cylinder 3's fuel injector. Use a multimeter to test the injector circuit and check the injector's resistance. If no issues are found, the ECM or timing system may need further evaluation.

6. How do I fix the P020C code on my GMC?

Repairs may include replacing the faulty fuel injector, repairing damaged wiring or connectors, or reprogramming or replacing the ECM if itâ€™s malfunctioning.

7. How much does it cost to fix the P020C code?

Repair costs vary but typically range from $150 to $500, depending on whether the issue is with the injector, wiring, or ECM.

8. Can a dirty fuel injector cause the P020C code?

Yes, a clogged or dirty fuel injector can disrupt the injection timing and trigger this code. Cleaning or replacing the injector may resolve the issue.

9. Does the P020C code always mean the injector is bad?

No, the problem could also stem from wiring issues, a faulty ECM, or timing system malfunctions. Proper diagnosis is crucial.

10. Can a weak battery cause the P020C code on a GMC?

A weak battery can cause voltage irregularities, potentially affecting the injector circuit and triggering this code. Ensure the battery and charging system are in good condition.