AutoCodes – Chevrolet – P021B 2018 Chevrolet Silverado

P021B 2018 Chevrolet Silverado Code - Cylinder 8 Injection Timing

Quick Answer

The Engine Control Module (ECM) has the ability to learn injector timing performance. Common causes include Faulty Fuel Injector 8, Fuel Injector 8 harness is open or shorted, Fuel Injector 8 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: P021B 2018 Chevrolet Silverado indicates Cylinder 8 Injection Timing.
Common causes: Common causes include Faulty Fuel Injector 8, Fuel Injector 8 harness is open or shorted, Fuel Injector 8 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 373

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 P021B 2018 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 P021B 2018 Chevrolet Silverado - Cylinder 8 Injection Timing - AutoCodes.com — P021B 2018 Chevrolet Silverado Code - Cylinder 8 Injection Timing

What does this mean?

What are the Possible Causes of the DTC P021B 2018 Chevrolet Silverado?

Faulty Fuel Injector 8
Fuel Injector 8 harness is open or shorted
Fuel Injector 8 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P021B 2018 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 P021B 2018 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 P021B 2018 Chevrolet Silverado code?

Need more information on how to fix the P021B 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

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 P021B 2018 Chevrolet Silverado Code

What does OBDII code P021B mean on a 2018 Chevrolet Silverado?

P021B indicates a problem with the injection timing for cylinder 8. The engine control module (ECM) has detected that the timing is outside the expected range.

What are the common symptoms of code P021B on a 2018 Chevrolet Silverado?

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

What causes code P021B on a 2018 Chevrolet Silverado?

Common causes include a faulty fuel injector, wiring issues, a malfunctioning ECM, or problems with the crankshaft or camshaft position sensors.

Can driving with code P021B damage my 2018 Chevrolet Silverado?

Yes, prolonged driving with this issue may lead to engine damage or further complications due to improper fuel delivery and timing.

How is code P021B diagnosed on a 2018 Chevrolet Silverado?

A mechanic will use a scan tool to verify the code, inspect the wiring and connectors for cylinder 8, test the fuel injector, and check related sensors like the crankshaft and camshaft position sensors.

What repairs can fix code P021B on a 2018 Chevrolet Silverado?

Repairs may involve replacing the cylinder 8 fuel injector, repairing damaged wiring or connectors, replacing faulty sensors, or reprogramming the ECM.

How much does it cost to fix code P021B on a 2018 Chevrolet Silverado?

Repair costs can vary widely depending on the issue but may range from $150 to $500 or more, depending on parts and labor.

Can a software update resolve code P021B on a 2018 Chevrolet Silverado?

In some cases, an ECM software update can address timing calibration issues, but this depends on the root cause of the code.

What preventative measures can help avoid code P021B on a 2018 Chevrolet Silverado?

Regular maintenance, such as inspecting fuel injectors, wiring, and sensors, can help prevent timing issues and ensure efficient engine performance.

Should I replace all injectors if code P021B is caused by a faulty injector?

Itâ€™s not always necessary to replace all injectors. Replacing only the faulty cylinder 8 injector may resolve the issue, but testing other injectors is recommended.