AutoCodes – GMC – B0237 GMC

B0237 GMC Code - Left Temperature Actuator

Quick Answer

Stepper motors are used for temperature regulation, air distribution control and recirculation door control. Common causes include Faulty Left Temperature Actuator, Left Temperature Actuator harness is open or shorted, Left Temperature Actuator 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: B0237 GMC indicates Left Temperature Actuator.
Common causes: Common causes include Faulty Left Temperature Actuator, Left Temperature Actuator harness is open or shorted, Left Temperature Actuator 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 1,158

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
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B0237 GMC Description

Stepper motors are used for temperature regulation, air distribution control and recirculation door control. With the switches and dials on the HVAC controls, air temperature door position, mode door position and recirculation door position can be selected. The selected values are passed to the Heating, Ventilation, and Air Conditioning (HVAC) Control Module via serial data. The HVAC control module supplies a 12 V reference voltage to the stepper motors and energizes the 4 stepper motor coils with a pulsed ground signal. The stepper motors move the appropriate doors into the calculated positions, in order to reach the desired positions.

OBDII Code B0237 GMC - Left Temperature Actuator - AutoCodes.com — B0237 GMC Code - Left Temperature Actuator

What does this mean?

What are the Possible Causes of the DTC B0237 GMC?

Faulty Left Temperature Actuator
Left Temperature Actuator harness is open or shorted
Left Temperature Actuator circuit poor electrical connection
Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module

How to Fix the DTC B0237 GMC?

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 does this mean?

Code Tech Notes

A broken or damaged air temperature door and or actuator can cause this Diagnostic Trouble Code (DTC) to set by allowing the actuator shaft to rotate completely to its internal stop (overtravel condition). Internal stops are outside the working range of feedback potentiometers 0-250 count. If the condition exists, wiggle wires and connectors and check for poor connections.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B0237 GMC 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 B0237 GMC Code

1. What are common symptoms of OBDII code B0237 GMC related to the Left Temperature Actuator?

- Common symptoms include inconsistent or incorrect temperature output from the left side vents, such as blowing hot air when set to cold or vice versa.

2. What is the typical cause of OBDII code B0237 GMC for the Left Temperature Actuator?

- The typical cause is a faulty or malfunctioning left temperature actuator, which is responsible for controlling the temperature output on the left side of the vehicle.

3. How can I diagnose the issue related to OBDII code B0237 GMC for the Left Temperature Actuator?

- Diagnose the problem by checking for any unusual noises coming from the HVAC system, verifying temperature differences between the left and right sides, and using a scan tool to retrieve the specific fault code.

4. Is it possible to repair the Left Temperature Actuator related to OBDII code B0237 GMC on my own?

- It is possible to repair the Left Temperature Actuator yourself if you have the necessary tools, skills, and access to replacement parts. However, professional assistance may be recommended for complex repairs.

5. Are there any quick troubleshooting tips for addressing OBDII code B0237 GMC regarding the Left Temperature Actuator?

- Quick troubleshooting tips include checking the fuse related to the HVAC system, ensuring proper connection of the actuator, and resetting the system by disconnecting the battery for a few minutes.

6. Can weather or environmental factors trigger OBDII code B0237 GMC for the Left Temperature Actuator?

- While weather or environmental factors may not directly trigger the fault code, extreme temperatures or humidity levels can exacerbate existing issues with the left temperature actuator.

7. What is the role of the Left Temperature Actuator in the vehicle's HVAC system?

- The Left Temperature Actuator is responsible for regulating and adjusting the temperature output on the left side of the vehicle, ensuring that the cabin remains at the desired temperature set by the driver.

8. Does OBDII code B0237 GMC for the Left Temperature Actuator affect the overall performance of the vehicle?

- While the fault code may not directly impact the vehicle's drivability, it can lead to discomfort for occupants due to inconsistent temperature control in the cabin.

9. Can I continue driving my vehicle with OBDII code B0237 GMC related to the Left Temperature Actuator?

- It is generally safe to drive the vehicle with this fault code, but addressing the issue promptly is recommended to maintain comfort and functionality of the HVAC system.

10. How much does it typically cost to repair OBDII code B0237 GMC for the Left Temperature Actuator at a mechanic or dealership?

- The cost of repairing this issue can vary depending on the labor rates and parts required. It is advisable to obtain quotes from different service providers to determine the most cost-effective solution.