AutoCodes – Hummer – B0159 Hummer

B0159 Hummer Code - Ambient Air Temperature Sensor Circuit Range/Performance

Quick Answer

The ambient air temperature sensor allows the Heating, Ventilation, and Air Conditioning (HVAC) Control Module to monitor the temperature of the air surrounding the front of the vehicle. Common causes include Faulty Ambient Air Temperature Sensor, Ambient Air Temperature Sensor harness is open or shorted, Ambient 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: B0159 Hummer indicates Ambient Air Temperature Sensor Circuit Range/Performance.
Common causes: Common causes include Faulty Ambient Air Temperature Sensor, Ambient Air Temperature Sensor harness is open or shorted, Ambient 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 2,883

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
Cost to Diagnose
FAQs
Comments
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Code B0159 Hummer Description

The ambient air temperature sensor allows the Heating, Ventilation, and Air Conditioning (HVAC) Control Module to monitor the temperature of the air surrounding the front of the vehicle. The inside air temperature sensor assembly allows the HVAC control module to monitor the temperature of the air inside the passenger compartment. The module applies 5 volts to internal input resistors that are connected to the signal circuits of the air temperature sensors. The module provides ground to the air temperature sensors through the low reference circuits. The HVAC control module monitors the voltage drops across the air temperature sensors and uses the inputs for automatic control calculations. The HVAC control module also uses the ambient air temperature input to calculate the value of the ambient air temperature display. When the air temperatures are cold, the resistances of the sensors are high and the voltage signals are high. When the air temperatures are hot, the resistances of the sensors are low and the voltage signals are low.

OBDII Code B0159 Hummer - Ambient Air Temperature Sensor Circuit Range/Performance - AutoCodes.com — B0159 Hummer Code - Ambient Air Temperature Sensor Circuit Range/Performance

What does this mean?

What are the Possible Causes of the DTC B0159 Hummer?

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

How to Fix the DTC B0159 Hummer?

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 B0159 Hummer 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 B0159 Hummer 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 B0159 Hummer Code

1. What are the common symptoms of OBDII code B0159 in a Hummer related to the Ambient Air Temperature Sensor Circuit Range/Performance?

- Common symptoms include inaccurate outside temperature readings on the dashboard, issues with the climate control system, and potential fluctuations in vehicle performance.

2. What are the possible causes of OBDII code B0159 in a Hummer?

- The code B0159 in a Hummer is typically triggered by a faulty ambient air temperature sensor, damaged wiring or connectors in the sensor circuit, or issues with the sensor's calibration.

3. How can I diagnose the Ambient Air Temperature Sensor Circuit on my Hummer?

- To diagnose the ambient air temperature sensor circuit, you can use a multimeter to test the sensor's resistance, check the wiring for any visible damage or corrosion, and ensure proper connection with the sensor.

4. Can a bad ambient air temperature sensor affect the performance of my Hummer?

- Yes, a malfunctioning ambient air temperature sensor can affect the performance of your Hummer by causing incorrect fuel mixture adjustments, leading to reduced fuel efficiency and potential engine performance issues.

5. What are some repair tips for resolving OBDII code B0159 in a Hummer?

- Repair tips include checking and replacing the ambient air temperature sensor if necessary, inspecting and repairing any damaged wiring or connectors in the circuit, and clearing the trouble codes with an OBDII scanner after repairs.

6. Is it safe to continue driving my Hummer with OBDII code B0159 related to the Ambient Air Temperature Sensor Circuit Range/Performance?

- It is generally safe to drive your Hummer with this code, but it is recommended to address the issue promptly to prevent any potential impact on fuel efficiency and overall vehicle performance.

7. Can I replace the ambient air temperature sensor in my Hummer myself?

- Yes, replacing the ambient air temperature sensor in a Hummer is typically a straightforward task that can be done by following the vehicle's service manual or online guides. It usually involves locating the sensor and swapping it with a new one.

8. Will resetting the OBDII code B0159 in my Hummer make the issue go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue, such as a faulty ambient air temperature sensor or wiring problem, is not addressed, the code is likely to reappear over time.

9. How much does it cost to repair OBDII code B0159 in a Hummer at a dealership or repair shop?

- The cost of repairing OBDII code B0159 in a Hummer can vary depending on the exact cause of the issue, but it generally ranges from $100 to $300 at a dealership or repair shop, including parts and labor.

10. Are there any recalls or technical service bulletins related to OBDII code B0159 in Hummer vehicles?

- It is recommended to check with your local dealership or visit the manufacturer's website to see if there are any recalls or technical service bulletins related to OBDII code B0159 specifically for your Hummer model.