AutoCodes – Chevrolet – P021A 2016 Chevrolet Silverado

P021A 2016 Chevrolet Silverado Code - Cylinder 7 Injection Timing

Quick Answer

The Engine Control Module (ECM) has the ability to learn injector timing performance. Common causes include Faulty Fuel Injector 7, Fuel Injector 7 harness is open or shorted, Fuel Injector 7 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: P021A 2016 Chevrolet Silverado indicates Cylinder 7 Injection Timing.
Common causes: Common causes include Faulty Fuel Injector 7, Fuel Injector 7 harness is open or shorted, Fuel Injector 7 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 203

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 P021A 2016 Chevrolet Silverado 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 P021A 2016 Chevrolet Silverado - Cylinder 7 Injection Timing - AutoCodes.com — P021A 2016 Chevrolet Silverado Code - Cylinder 7 Injection Timing

What does this mean?

What are the Possible Causes of the DTC P021A 2016 Chevrolet Silverado?

Faulty Fuel Injector 7
Fuel Injector 7 harness is open or shorted
Fuel Injector 7 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P021A 2016 Chevrolet Silverado?

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 P021A 2016 Chevrolet Silverado 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 P021A 2016 Chevrolet Silverado code?

Need more information on how to fix the P021A 2016 Chevrolet Silverado code? Get Access to Factory Service Manuals

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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 P021A 2016 Chevrolet Silverado Code

What does OBDII code P021A mean for a 2016 Chevrolet Silverado?

P021A indicates an issue with the injection timing for Cylinder 7, which may affect engine performance and efficiency.

What are the common symptoms of code P021A in a 2016 Chevrolet Silverado?

Symptoms may include rough idling, poor acceleration, reduced fuel efficiency, engine misfires, or an illuminated check engine light.

What causes code P021A to appear on a 2016 Chevrolet Silverado?

Common causes include a faulty fuel injector, wiring issues, a malfunctioning ECM, or problems with the fuel injection timing system.

Can you drive a 2016 Chevrolet Silverado with code P021A?

Driving with this code is not recommended, as it can lead to further engine damage or poor performance if the issue is not resolved.

How do you diagnose code P021A on a 2016 Chevrolet Silverado?

Diagnosis typically involves scanning for other codes, inspecting the Cylinder 7 injector and wiring, checking fuel pressure, and testing the ECM for faults.

What repairs can fix code P021A in a 2016 Chevrolet Silverado?

Repairs may include replacing the Cylinder 7 injector, repairing damaged wiring, updating or reprogramming the ECM, or addressing fuel delivery issues.

Can a clogged fuel injector cause code P021A?

Yes, a clogged or malfunctioning fuel injector can disrupt injection timing and trigger code P021A.

How much does it cost to fix code P021A on a 2016 Chevrolet Silverado?

Repair costs vary depending on the issue but can range from $150 to $1,000, depending on whether the injector, wiring, or ECM needs replacement.

Does code P021A always mean the injector is bad?

No, other issues like faulty wiring, a malfunctioning ECM, or fuel delivery problems can also cause this code.

Can a software update fix code P021A in a 2016 Chevrolet Silverado?

In some cases, an ECM software update or reprogramming can resolve the issue if it is related to timing miscalculations.

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