AutoCodes – Generic – B1221

B1221 Code - Open In The Rear Mode Control Motor Circuit

Quick Answer

The Rear Climate Control Unit monitors the Rear Mode Control Motor. Common causes include Faulty Rear Mode Control Motor, Rear Mode Control Motor harness is open or shorted, Rear Mode Control 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: B1221 indicates Open In The Rear Mode Control Motor Circuit.
Common causes: Common causes include Faulty Rear Mode Control Motor, Rear Mode Control Motor harness is open or shorted, Rear Mode Control 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 11,041

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 19, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1221 Description

The Rear Climate Control Unit monitors the Rear Mode Control Motor. The Rear Climate Control Unit sets the OBDII code when the Rear Mode Control Motor is not to factory specifications.

OBDII Code B1221 - Open In The Rear Mode Control Motor Circuit - AutoCodes.com — B1221 Code - Open In The Rear Mode Control Motor Circuit

What does this mean?

What are the Possible Causes of the DTC B1221?

Faulty Rear Mode Control Motor
Rear Mode Control Motor harness is open or shorted
Rear Mode Control Motor circuit poor electrical connection
Faulty Rear Climate Control Unit
Faulty A/C Control Panel

How to Fix the DTC B1221?

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 B1221 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 B1221 code?

Need more information on how to fix the B1221 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1221 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1221 Acura — Open In The Rear Mode Control Motor Circuit
B1221 Honda — Open In The Rear Mode Control Motor Circuit

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 B1221 Code

1. What are the common symptoms of OBDII code B1221?

- Common symptoms include issues with the rear mode control motor not functioning properly, resulting in inconsistent airflow distribution in the vehicle's HVAC system.

2. What causes the OBDII code B1221 to trigger?

- The code is usually triggered when there is an open circuit detected in the rear mode control motor circuit, leading to a malfunction in controlling the air distribution at the rear of the vehicle.

3. How can I diagnose the OBDII code B1221?

- Diagnosing this code typically involves checking the wiring and connections related to the rear mode control motor, as well as testing the motor itself for proper operation.

4. Can I still drive my vehicle with the OBDII code B1221 present?

- While the vehicle may still be driveable with this code, it is advisable to address the issue promptly to ensure proper functioning of the HVAC system, especially for passenger comfort.

5. What are some repair tips for resolving OBDII code B1221?

- Repair tips may include inspecting and repairing any damaged wiring, ensuring proper connections, and replacing the rear mode control motor if necessary to eliminate the open circuit issue.

6. Is it possible to reset the OBDII code B1221 without fixing the underlying issue?

- Resetting the code without addressing the root cause will likely result in the code reappearing once the system detects the open circuit problem again.

7. Can a DIY enthusiast fix the OBDII code B1221 at home?

- Depending on the individual's skill level and access to tools, DIY enthusiasts may be able to address the code by following repair guides and tutorials specific to the rear mode control motor circuit.

8. Will fixing the OBDII code B1221 require professional assistance?

- If diagnosing and repairing electrical issues is outside your comfort zone, seeking professional assistance from a mechanic or automotive technician familiar with HVAC systems is recommended.

9. Are there any preventive measures to avoid OBDII code B1221 in the future?

- Regular maintenance checks on the HVAC system, including inspecting wiring and connections, can help prevent issues like an open circuit in the rear mode control motor circuit that triggers this OBDII code.

10. How crucial is it to address the OBDII code B1221 promptly?

- Promptly addressing the code is important to ensure the proper functioning of the vehicle's HVAC system, maintain passenger comfort, and prevent potential long-term damage to the rear mode control motor circuit.