AutoCodes – Chevrolet – B1020 2018 Chevrolet Silverado

B1020 2018 Chevrolet Silverado Code - Auxiliary Electronic Control Unit Performance

Quick Answer

The Heating, Ventilation, and Air Conditioning (HVAC) module communicates with the HVAC controls via serial data. Common causes include Faulty Heating, Ventilation, and Air Conditioning (HVAC) Controls, HVAC Controls harness is open or shorted, HVAC Controls 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: B1020 2018 Chevrolet Silverado indicates Auxiliary Electronic Control Unit Performance.
Common causes: Common causes include Faulty Heating, Ventilation, and Air Conditioning (HVAC) Controls, HVAC Controls harness is open or shorted, HVAC Controls 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 196

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 Apr 06, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1020 2018 Chevrolet Silverado Description

The Heating, Ventilation, and Air Conditioning (HVAC) module communicates with the HVAC controls via serial data. This Diagnostic Trouble Code (DTC) indicates a fault in the HVAC controls. The HVAC controls may continue to respond normally to faceplate functions when this DTC is set. The DTC will be set when the HVAC module receives an improper status response indicating an internal ECU fault in the HVAC controls.

OBDII Code B1020 2018 Chevrolet Silverado - Auxiliary Electronic Control Unit Performance - AutoCodes.com — B1020 2018 Chevrolet Silverado Code - Auxiliary Electronic Control Unit Performance

What does this mean?

What are the Possible Causes of the DTC B1020 2018 Chevrolet Silverado?

Faulty Heating, Ventilation, and Air Conditioning (HVAC) Controls
HVAC Controls harness is open or shorted
HVAC Controls circuit poor electrical connection

How to Fix the DTC B1020 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 B1020 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 B1020 2018 Chevrolet Silverado code?

Need more information on how to fix the B1020 2018 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 B1020 2018 Chevrolet Silverado Code

1. What does the OBDII code B1020 mean on a 2018 Chevrolet Silverado?

B1020 refers to "Auxiliary Electronic Control Unit Performance," indicating an issue with the auxiliary electronic control unit's functionality or communication.

2. What are the common symptoms of code B1020 in a 2018 Chevy Silverado?

Symptoms may include malfunctioning auxiliary systems (like seat controls or infotainment), warning lights on the dashboard, or intermittent electronic failures.

3. What causes the B1020 code in a 2018 Chevrolet Silverado?

Common causes include a faulty auxiliary electronic control unit, poor wiring connections, damaged harnesses, or software-related issues.

4. Can a blown fuse cause the B1020 code?

Yes, a blown or faulty fuse related to the auxiliary electronic control unit can lead to this code.

5. How do you diagnose the B1020 code on a Chevrolet Silverado?

Diagnosis involves scanning the vehicle with an OBDII tool, inspecting the auxiliary electronic control unit, checking wiring and connectors, and testing related fuses.

6. Can the B1020 code affect vehicle performance?

While it typically doesnâ€™t affect engine performance, it can impact auxiliary systems like heated seats, infotainment, or other electronic features.

7. Is the B1020 code likely to return after clearing it?

If the underlying issue isnâ€™t fixed (e.g., damaged wiring or a faulty control unit), the code may return after clearing it.

8. How much does it cost to fix the B1020 code on a 2018 Silverado?

Repair costs vary but may include $100-$300 for diagnostics, plus additional costs if parts like the control unit or wiring need replacement.

9. Can I drive my 2018 Silverado with the B1020 code?

Yes, you can drive the vehicle, but auxiliary functions may be impaired, and ignoring the code could lead to further electrical issues.

10. What are the repair steps for the B1020 code?

Repair steps include checking and replacing fuses, inspecting and repairing wiring, updating software, or replacing the auxiliary electronic control unit if needed.