AutoCodes – GMC – P020C 2015 GMC Sierra

P020C 2015 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 2015 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 162
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Mar 22, 2024
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Code P020C 2015 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 2015 GMC Sierra - Cylinder 3 Injection Timing - AutoCodes.com
P020C 2015 GMC Sierra Code - Cylinder 3 Injection Timing

What are the Possible Causes of the DTC P020C 2015 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 2015 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 2015 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 2015 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 2015 GMC Sierra Code

1. What does the OBDII code P020C mean on a 2015 GMC Sierra?

P020C indicates an issue with the injection timing for cylinder 3, meaning the fuel injector may not be delivering fuel at the correct time.

2. What are common symptoms of the P020C code in a 2015 GMC Sierra?

Symptoms include rough idling, engine misfires, reduced fuel efficiency, loss of power, and in some cases, the engine may not start.

3. What causes the P020C code to appear on a 2015 GMC Sierra?

Common causes include a faulty fuel injector, wiring or connector issues in the injector circuit, a malfunctioning ECM, or low fuel pressure.

4. Can I drive my 2015 GMC Sierra with a P020C code?

Driving with this code is not recommended as it may cause further engine damage, reduced performance, and increased emissions.

5. How do I diagnose a P020C code on a 2015 GMC Sierra?

Diagnosing this code involves inspecting the fuel injector wiring and connectors, testing the injector itself, checking the ECM, and verifying proper fuel pressure.

6. How can I fix the P020C code on my 2015 GMC Sierra?

Repairs may include replacing the faulty injector, repairing damaged wiring or connectors, cleaning the injector, or reprogramming or replacing the ECM.

7. How much does it cost to repair a P020C code on a 2015 GMC Sierra?

Repair costs vary but typically range from $150 to $400 for a fuel injector replacement, plus diagnostic fees, with higher costs for ECM repairs.

8. Can a dirty fuel injector cause the P020C code on a 2015 GMC Sierra?

Yes, a clogged or dirty fuel injector can lead to improper injection timing and trigger the P020C code.

9. Will clearing the P020C code fix the problem on a 2015 GMC Sierra?

Clearing the code may temporarily remove the warning, but the underlying issue must be addressed to prevent the code from returning.

10. Is the P020C code specific to cylinder 3 on a 2015 GMC Sierra?

Yes, the P020C code specifically refers to an issue with the injection timing for cylinder 3 in the engine.

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