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Engine-Codes – GMC – B0337 GMC

B0337 GMC Code - Inside Temperature Sensor Short To Ground

Quick Answer

The B0337 diagnostic trouble code (DTC) indicates a malfunction related to the inside temperature sensor, specifically a short circuit to ground. Common causes include Damaged wiring or connectors leading to the inside temperature sensor, A malfunctioning inside temperature sensor itself, Corrosion or dirt buildup at the sensor connection points. 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
B0337 GMC indicates Inside Temperature Sensor Short To Ground.
Common causes
Common causes include Damaged wiring or connectors leading to the inside temperature sensor, A malfunctioning inside temperature sensor itself, Corrosion or dirt buildup at the sensor connection points.
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.
What is this?
Table of contents Created and updated by William Orellana on Oct 21, 2024
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Code B0337 GMC Description

The B0337 diagnostic trouble code (DTC) indicates a malfunction related to the inside temperature sensor, specifically a short circuit to ground. This sensor is integral to the climate control system of the vehicle, as it measures the temperature of the cabin air and relays this information to the engine control module (ECM) or body control module (BCM). When the sensor experiences a short to ground, it can lead to erroneous readings, which may cause the climate control system to behave unpredictably.

OBDII Code B0337 GMC - Inside Temperature Sensor Short To Ground
B0337 GMC Code - Inside Temperature Sensor Short To Ground

Common Causes of B0337 GMC

  1. Damaged wiring or connectors leading to the inside temperature sensor.
  2. A malfunctioning inside temperature sensor itself.
  3. Corrosion or dirt buildup at the sensor connection points.
  4. Faulty ECM or BCM that misinterprets sensor signals.
  5. Environmental factors such as moisture ingress that can short the sensor circuit.

Symptoms of B0337 GMC

  1. Inconsistent or erratic temperature readings on the climate control display.
  2. HVAC system fails to respond to temperature adjustments (e.g., air conditioning not cooling or heating properly).
  3. Constant operation of the blower motor at maximum speed regardless of settings.
  4. Increased cabin humidity or fogging of windows due to improper climate control.
  5. Potential triggering of other related DTCs due to the malfunctioning sensor.

How to Fix B0337 GMC

  1. Visual Inspection: Begin with a thorough visual inspection of the wiring and connectors associated with the inside temperature sensor. Look for signs of damage, corrosion, or loose connections.
  2. Test the Sensor: Use a multimeter to test the resistance of the inside temperature sensor. Compare the readings to the manufacturer’s specifications to determine if the sensor is functioning correctly.
  3. Repair or Replace Wiring: If damaged wiring or connectors are found, repair or replace them as necessary to ensure a proper connection and eliminate the short to ground.
  4. Replace the Sensor: If the sensor itself is faulty, replace it with a new unit. Ensure that the new sensor is compatible with the vehicle's make and model.
  5. Clear Codes and Test Drive: After repairs, clear any diagnostic trouble codes using an OBD-II scanner and take the vehicle for a test drive to ensure the HVAC system operates correctly and no new codes appear.

Cost to Fix B0337 GMC

The typical cost for diagnosing and repairing a B0337 code can range from $150 to $600, depending on the specific repairs needed. This estimate includes parts and labor; for instance, a new inside temperature sensor may cost between $50 and $150, while labor can vary widely based on location and shop rates. Most auto repair shops charge between $80 and $150 per hour, with rates in metropolitan areas or at dealerships often being higher. Independent shops may offer lower rates. It's advisable to check local rates and get a detailed estimate for a more precise understanding of potential costs.

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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 B0337 GMC Code

1. What are the common symptoms of OBDII code B0337 GMC (Inside Temperature Sensor Short To Ground)?

The common symptoms of this code may include inaccurate readings on the interior temperature display, HVAC system malfunctions, and potential issues with the climate control system.

2. What are the possible causes of OBDII code B0337 GMC?

The possible causes of this code include a short to ground in the wiring leading to the inside temperature sensor, a faulty inside temperature sensor, or a problem with the body control module.

3. How can I diagnose OBDII code B0337 GMC?

Diagnosing this code involves using a scan tool to read the trouble codes, checking the wiring and connections to the inside temperature sensor, testing the sensor itself, and inspecting the body control module for any faults.

4. Can I still drive my vehicle with OBDII code B0337 GMC present?

While it may be possible to drive the vehicle with this code, it is recommended to address the issue promptly to prevent further damage to the climate control system and ensure accurate temperature readings inside the vehicle.

5. How can I repair OBDII code B0337 GMC?

Repairing this code typically involves fixing the short to ground in the wiring, replacing the inside temperature sensor if necessary, or repairing/replacing the body control module if it is causing the issue.

6. Are there any DIY tips for fixing OBDII code B0337 GMC?

DIY tips for fixing this code may include checking the wiring and connections for visible damage, ensuring proper sensor installation, and consulting the vehicle's service manual for specific repair procedures.

7. Can a faulty inside temperature sensor cause other issues in the vehicle?

Yes, a faulty inside temperature sensor can cause issues with the HVAC system, climate control functions, and overall comfort levels inside the vehicle.

8. How can I prevent OBDII code B0337 GMC from recurring?

To prevent this code from recurring, it is essential to address any underlying wiring issues, ensure proper installation of components, and perform regular maintenance on the climate control system.

9. Is resetting the trouble codes enough to fix OBDII code B0337 GMC?

Resetting the trouble codes may clear the code temporarily, but it will not fix the underlying issue causing the code. It is crucial to diagnose and repair the problem to prevent the code from coming back.

10. Is it safe to ignore OBDII code B0337 GMC?

Ignoring this code may lead to inaccurate temperature readings inside the vehicle and potential issues with the climate control system. It is advisable to address the problem to maintain the functionality of the HVAC system.

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