AutoCodes – Saturn – B0237 Saturn

B0237 Saturn 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 Saturn 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 836

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 Saturn 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 Saturn - Left Temperature Actuator - AutoCodes.com — B0237 Saturn Code - Left Temperature Actuator

What does this mean?

What are the Possible Causes of the DTC B0237 Saturn?

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 Saturn?

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 Saturn 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 B0237 Saturn code?

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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 Saturn Code

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

- Common symptoms include inconsistent or incorrect temperature control on the left side of the vehicle's climate system, such as blowing hot air when set to cool or vice versa.

2. What is the main cause of OBDII code B0237 in a Saturn?

- The main cause of this code is often a malfunctioning Left Temperature Actuator, which is responsible for regulating the temperature on the left side of the vehicle's climate control system.

3. How can I diagnose if the Left Temperature Actuator is the issue triggering OBDII code B0237 in my Saturn?

- To diagnose the issue, you can perform a visual inspection of the actuator, check for any unusual noises coming from the HVAC system, and use a diagnostic scanner to read the specific error codes.

4. Can I still drive my Saturn with OBDII code B0237 related to the Left Temperature Actuator?

- While it is possible to drive the vehicle with this code, it is not recommended as it may lead to discomfort due to inconsistent temperature control and potentially worsen the underlying issue.

5. What are some repair tips for resolving OBDII code B0237 in a Saturn?

- Repair tips include replacing the faulty Left Temperature Actuator, ensuring proper calibration of the new actuator, and resetting the system to clear the error code.

6. Are there any DIY solutions for fixing OBDII code B0237 in a Saturn?

- DIY solutions may involve replacing the Left Temperature Actuator yourself if you have the necessary tools and skills, following a repair manual or online guides for guidance.

7. How much does it typically cost to repair OBDII code B0237 in a Saturn at a dealership or auto repair shop?

- The cost of repairing this OBDII code can vary depending on the labor rates and parts costs, but it generally ranges from $200 to $500 at a dealership or auto repair shop.

8. What other OBDII codes may be related to issues with the Left Temperature Actuator in a Saturn?

- Other related OBDII codes may include B0238 (Right Temperature Actuator circuit malfunction) or B0243 (Recirculation Actuator circuit malfunction) if the climate control system is affected.

9. Can a faulty Left Temperature Actuator impact the overall performance or safety of my Saturn?

- While a faulty actuator may not directly impact the overall performance or safety of the vehicle, it can lead to discomfort for the occupants and affect the efficiency of the climate control system.

10. How often should the Left Temperature Actuator be inspected or replaced in a Saturn to prevent OBDII code B0237 from recurring?

- It is recommended to have the Left Temperature Actuator inspected during regular maintenance checks and replaced as needed to prevent the reoccurrence of OBDII code B0237 in a Saturn.