AutoCodes – Generic – B2266

B2266 Code - Left Side Blend Door Circuit Failure

Quick Answer

Under normal operation, to rotate the temperature blend door actuator, the HVAC module supplies voltage and ground to the temperature blend door actuators through the door actuator motor circuits. Common causes include Faulty Left Side Blend Door Actuator, Left Side Blend Door Actuator harness is open or shorted, Left Side Blend Door Actuator 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: B2266 indicates Left Side Blend Door Circuit Failure.
Common causes: Common causes include Faulty Left Side Blend Door Actuator, Left Side Blend Door Actuator harness is open or shorted, Left Side Blend Door Actuator 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 3,473

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 Oct 29, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2266 Description

Under normal operation, to rotate the temperature blend door actuator, the HVAC module supplies voltage and ground to the temperature blend door actuators through the door actuator motor circuits. To reverse the temperature blend door actuator rotation, the Heating, Ventilation, and Air-Conditioning (HVAC) Module reverses the voltage and ground circuits.
The temperature blend door actuator feedback resistors are supplied a ground from the HVAC module by the temperature blend door actuator return circuits and a 5-volt reference voltage on the temperature blend door actuator reference circuits. The HVAC module reads the voltage on the temperature blend door actuator feedback circuits to determine the temperature blend door actuator position by the position of the actuator feedback resistor wiper arm.
During an actuator calibration cycle, the HVAC module drives the temperature blend door until the door reaches both internal stops in the HVAC case. If the temperature blend door is temporarily obstructed or binding during a calibration cycle, the HVAC module may interpret this as the actual end of travel for the door. When this condition occurs and the HVAC module commands the actuator to its end of travel, the airflow may not be from the expected outlets.
The Diagnostic Trouble Code (DTC) sets when the module senses no change in actuator feedback voltage when the actuator motor has been energized.

OBDII Code B2266 - Left Side Blend Door Circuit Failure - AutoCodes.com — B2266 Code - Left Side Blend Door Circuit Failure

What does this mean?

What are the Possible Causes of the DTC B2266?

Faulty Left Side Blend Door Actuator
Left Side Blend Door Actuator harness is open or shorted
Left Side Blend Door Actuator circuit poor electrical connection
Faulty Heating, Ventilation, and Air-Conditioning (HVAC) Module
Faulty Electronic Manual Temperature Control (EMTC)

How to Fix the DTC B2266?

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 B2266 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 B2266 code?

Need more information on how to fix the B2266 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2266 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2266 Ford — Left Side Blend Door Circuit Failure
B2266 Lincoln — Left Side Blend Door Circuit Failure
B2266 Mercury — Left Side Blend Door Circuit Failure

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 B2266 Code

1. What are the common symptoms of OBDII code B2266 (Left Side Blend Door Circuit Failure)?

- Common symptoms include inconsistent temperature control on the left side of the vehicle, hot air blowing when cold is selected, or cold air blowing when heat is selected.

2. What is the usual cause of OBDII code B2266?

- The most common cause of B2266 is a malfunction in the left side blend door actuator or a wiring issue in the circuit.

3. How can I diagnose the issue related to OBDII code B2266?

- To diagnose the issue, you can use a scan tool to check for the specific code, inspect the left side blend door actuator for proper operation, and test the wiring for any faults.

4. Can I drive my vehicle with OBDII code B2266 present?

- It is generally not recommended to drive with this code present, as it can lead to discomfort due to improper temperature control and may cause further damage to the HVAC system.

5. How can I repair OBDII code B2266?

- Repairing B2266 usually involves replacing the left side blend door actuator if it is faulty and repairing any wiring issues in the circuit.

6. Are there any DIY tips for fixing OBDII code B2266?

- While it is recommended to have a professional diagnose and repair this issue, you can attempt to check the actuator and wiring connections yourself if you have the necessary tools and knowledge.

7. Will resetting the OBDII code B2266 make it go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue with the blend door actuator or circuit is not fixed, the code is likely to reappear.

8. Is OBDII code B2266 a common problem in certain vehicle makes or models?

- B2266 can occur in various vehicle makes and models with HVAC systems that utilize blend door actuators, but it may be more prevalent in specific brands known for HVAC issues.

9. Can extreme weather conditions affect the likelihood of OBDII code B2266 occurring?

- Extreme temperature changes or prolonged exposure to harsh weather conditions can potentially accelerate wear and tear on blend door actuators, increasing the risk of circuit failures like B2266.

10. What should I do if I encounter OBDII code B2266 despite having recently replaced the blend door actuator?

- If the code persists even after replacing the actuator, it is recommended to have a professional technician inspect the entire HVAC system for other underlying issues causing the circuit failure.