AutoCodes – Cadillac – B0212 Cadillac

B0212 Cadillac Code - Rear Blower Motor Speed Open

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: B0212 Cadillac indicates Rear Blower Motor Speed Open.
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.

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Code Popularity 923

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
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Code B0212 Cadillac 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 B0212 Cadillac - Rear Blower Motor Speed Open - AutoCodes.com — B0212 Cadillac Code - Rear Blower Motor Speed Open

What does this mean?

What are the Possible Causes of the DTC B0212 Cadillac?

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 B0212 Cadillac?

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 B0212 Cadillac 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.

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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 B0212 Cadillac Code

1. What are the common symptoms of OBDII code B0212 Cadillac (Rear Blower Motor Speed Open)?

- The common symptoms include the rear blower motor not working, lack of airflow in the rear vents, and inconsistent climate control in the back seats.

2. What can cause the OBDII code B0212 Cadillac to trigger?

- The code B0212 typically triggers when there is an open circuit or malfunction in the rear blower motor speed control circuit.

3. How can I diagnose the issue with the rear blower motor in my Cadillac triggering code B0212?

- To diagnose the issue, you can start by checking the rear blower motor fuse, inspecting the wiring for any damage, and testing the blower motor for proper functionality.

4. What are some repair tips for fixing OBDII code B0212 Cadillac related to the rear blower motor?

- Repair tips may include replacing a faulty rear blower motor, repairing damaged wiring or connectors, and resetting the trouble code after the issue is resolved.

5. Is it safe to continue driving my Cadillac with OBDII code B0212 (Rear Blower Motor Speed Open)?

- It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to ensure proper climate control and comfort for passengers in the rear seats.

6. Can a DIY enthusiast fix the OBDII code B0212 Cadillac issue with the rear blower motor?

- Depending on the skill level and experience, DIY enthusiasts may be able to diagnose and repair the issue related to the rear blower motor. However, it is recommended to consult a professional mechanic for complex electrical repairs.

7. How much does it typically cost to repair OBDII code B0212 Cadillac in relation to the rear blower motor?

- The cost of repair can vary depending on the root cause of the issue, the need for parts replacement, and labor charges. It is advisable to obtain quotes from auto repair shops for an accurate estimate.

8. Can extreme weather conditions impact the triggering of OBDII code B0212 Cadillac?

- Yes, extreme hot or cold weather conditions can potentially exacerbate issues with the rear blower motor, leading to the triggering of code B0212 due to increased strain on the HVAC system.

9. Are there any preventive measures to avoid OBDII code B0212 Cadillac from recurring?

- Regularly servicing and maintaining the HVAC system, checking the rear blower motor components for any signs of wear, and addressing any unusual noises or lack of airflow promptly can help prevent the recurrence of the code.

10. How long does it typically take to repair OBDII code B0212 Cadillac related to the rear blower motor?

- The repair time can vary based on the complexity of the issue, availability of parts, and the mechanic's experience. Simple fixes may take a few hours, while more complex repairs could require a day or more.