AutoCodes – GMC – B1331 GMC

B1331 GMC Code - Upper Right Air Temperature Sensor

Quick Answer

The Instrument Panel Module (IPM) monitors the temperature sensors to maintain the comfort level inside of the vehicle. Common causes include Faulty Upper Right Air Temperature Sensor, Upper Right Air Temperature Sensor harness is open or shorted, Upper Right Air Temperature Sensor 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: B1331 GMC indicates Upper Right Air Temperature Sensor.
Common causes: Common causes include Faulty Upper Right Air Temperature Sensor, Upper Right Air Temperature Sensor harness is open or shorted, Upper Right Air Temperature Sensor 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 887

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 Nov 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1331 GMC Description

The Instrument Panel Module (IPM) monitors the temperature sensors to maintain the comfort level inside of the vehicle. The temperature sensors are a 2 wire negative temperature co-efficient thermistor. The IPM applies 5 volts to internal input resistors that are connected to the signal circuits of the air temperature sensors. The IPM provides the ground to the air temperature sensors through the low reference circuit. The IPM monitors the voltage drop across the air temperature sensors and uses the inputs for automatic control calculations. When the air temperatures are cold, the resistance of the sensors are high and the voltage signals are high. When the air temperatures are hot, the resistance of the sensors are low and the voltage signals are low. The IPM converts the voltage values to count values where one volt is approximately equal to 51 counts.

OBDII Code B1331 GMC - Upper Right Air Temperature Sensor - AutoCodes.com — B1331 GMC Code - Upper Right Air Temperature Sensor

What does this mean?

What are the Possible Causes of the DTC B1331 GMC?

Faulty Upper Right Air Temperature Sensor
Upper Right Air Temperature Sensor harness is open or shorted
Upper Right Air Temperature Sensor circuit poor electrical connection
Faulty Instrument Panel Module (IPM)

How to Fix the DTC B1331 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1331 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 B1331 GMC Code

1. What is OBDII code B1331 for a GMC Upper Right Air Temperature Sensor?

Code B1331 indicates a fault with the Upper Right Air Temperature Sensor in a GMC vehicle.

2. What are the common symptoms of a faulty Upper Right Air Temperature Sensor?

Common symptoms include inaccurate temperature readings, incorrect HVAC system operation, and potential illumination of the check engine light.

3. What are the possible causes of OBDII code B1331 in a GMC vehicle?

Causes may include a defective upper right air temperature sensor, wiring issues, or a faulty HVAC control module.

4. How can I diagnose a problem with the Upper Right Air Temperature Sensor?

Diagnosis typically involves using a scan tool to retrieve the specific trouble code, testing the sensor for proper operation, and inspecting the related wiring for any issues.

5. Can a DIY enthusiast repair or replace the Upper Right Air Temperature Sensor?

For those with experience working on vehicles, replacing the sensor may be feasible. However, it is recommended to consult a professional for an accurate diagnosis and repair.

6. Are there any tips for repairing OBDII code B1331 related to the Upper Right Air Temperature Sensor?

Ensure the sensor is replaced with a high-quality OEM or equivalent part to avoid future issues, and carefully follow the manufacturer's guidelines for installation.

7. How critical is it to address OBDII code B1331 in a timely manner?

While the vehicle may still be operational with this issue, addressing it promptly is recommended to prevent potential inaccuracies in temperature readings and ensure proper HVAC system functionality.

8. Can a faulty Upper Right Air Temperature Sensor impact the vehicle's performance?

While the sensor's primary function is related to the HVAC system, a malfunctioning sensor could potentially affect the vehicle's overall performance if left unresolved.

9. Is it safe to continue driving with OBDII code B1331 present?

It is generally safe to drive with this code present, but it is advisable to address the issue at the earliest convenience to avoid any potential complications with the HVAC system.

10. How much does it typically cost to repair OBDII code B1331 related to the Upper Right Air Temperature Sensor?

The cost of repair can vary depending on the specific diagnosis, parts needed, and labor rates. It is recommended to obtain estimates from reputable automotive shops for an accurate cost assessment.