AutoCodes – Generic – B0211

B0211 Code - Rear Blower Motor Speed High

Quick Answer

The Auxiliary Blower Motor Control Module is an interface between the Heating, Ventilation, and Air Conditioning (HVAC) Control Module and the Auxiliary (Rear) Blower Motor. Common causes include Faulty Auxiliary (Rear) Blower Motor, Auxiliary (Rear) Blower Motor harness is open or shorted, Auxiliary (Rear) Blower Motor circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: B0211 indicates Rear Blower Motor Speed High.
Common causes: Common causes include Faulty Auxiliary (Rear) Blower Motor, Auxiliary (Rear) Blower Motor harness is open or shorted, Auxiliary (Rear) Blower Motor circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,329

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 10, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B0211 Description

The Auxiliary Blower Motor Control Module is an interface between the Heating, Ventilation, and Air Conditioning (HVAC) Control Module and the Auxiliary (Rear) Blower Motor. The auxiliary blower motor control module has 5 circuits: a B+ input, ground, a control signal from the HVAC module, a B+ output and a low side Pulse Width Modulation (PWM) control to the Auxiliary (Rear) Blower Motor. The HVAC control module provides a low side (PWM) signal to the auxiliary blower motor control module in order to request the auxiliary blower motor speed. The auxiliary blower motor control module grounds the blower motor using a low side PWM signal in order to vary the auxiliary blower motor speed.

OBDII Code B0211 - Rear Blower Motor Speed High - AutoCodes.com — B0211 Code - Rear Blower Motor Speed High

What does this mean?

What are the Possible Causes of the DTC B0211?

Faulty Auxiliary (Rear) Blower Motor
Auxiliary (Rear) Blower Motor harness is open or shorted
Auxiliary (Rear) Blower Motor circuit poor electrical connection
Faulty Auxiliary Blower Motor Control Module
Faulty Heating, Ventilation, and Air Conditioning (HVAC)

How to Fix the DTC B0211?

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 B0211 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 B0211 code?

Need more information on how to fix the B0211 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0211 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B0211 Buick — Rear Blower Motor Speed High
B0211 Cadillac — Rear Blower Motor Speed High
B0211 Chevrolet — Rear Blower Motor Speed High
B0211 GMC — Rear Blower Motor Speed High

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 B0211 Code

1. What does OBDII code B0211 mean?

B0211 indicates an issue with the rear blower motor speed being stuck on high or not responding as intended.

2. What are the common symptoms of code B0211?

Symptoms include the rear blower motor running only at high speed, lack of speed control, or the rear HVAC system not functioning correctly.

3. What causes the B0211 code to appear?

Common causes include a malfunctioning rear blower motor resistor, a shorted blower motor, wiring issues, or a faulty HVAC control module.

4. Can I drive with an active B0211 code?

Yes, but the rear HVAC system may not function properly, potentially causing discomfort for rear passengers.

5. How can I diagnose the cause of code B0211?

Check the blower motor resistor, inspect the blower motor for damage, and test wiring connections for shorts or corrosion.

6. What tools are needed to fix a B0211 code?

Youâ€™ll typically need a multimeter, a diagnostic scanner, and basic hand tools for inspecting and replacing components.

7. How do I fix the issue causing code B0211?

Repairs may involve replacing the blower motor resistor, repairing damaged wiring, or replacing the rear blower motor itself.

8. How much does it cost to fix the B0211 code?

Repair costs vary, but replacing a blower motor resistor typically ranges from $50 to $150, while labor costs depend on the vehicle.

9. Can a faulty HVAC control module trigger code B0211?

Yes, a malfunctioning HVAC control module can send incorrect signals to the blower motor, causing the code to appear.

10. How can I prevent code B0211 from recurring?

Regularly inspect the HVAC system components, keep wiring connections clean, and replace worn parts promptly to prevent future issues.

Discuss the causes and fixes for B0211 OBDII Code

Submit a New Comment

Code B0211 comments

No comments found for this page.

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.