AutoCodes – GMC – B0159 GMC

B0159 GMC 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 GMC 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 8,874

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

What does this mean?

What are the Possible Causes of the DTC B0159 GMC?

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 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 B0159 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 B0159 GMC Code

1. What are the common symptoms of OBDII code B0159 GMC (Ambient Air Temperature Sensor Circuit Range/Performance)?

- Common symptoms may include inaccurate temperature readings on the vehicle's display, issues with the HVAC system, and potential impact on fuel efficiency.

2. What are the possible causes of OBDII code B0159 GMC?

- The code B0159 GMC can be triggered by a faulty ambient air temperature sensor, wiring issues, poor electrical connections, or a malfunctioning HVAC control module.

3. How can I diagnose the cause of OBDII code B0159 GMC?

- Diagnosing the issue typically involves using a scan tool to retrieve the trouble codes, testing the ambient air temperature sensor, inspecting the wiring for damage, and checking the connections for corrosion or looseness.

4. Can I still drive my vehicle with OBDII code B0159 GMC?

- While the vehicle may still be operable with this code, it is recommended to address the issue promptly to prevent any potential negative impact on performance or fuel efficiency.

5. How can I repair OBDII code B0159 GMC?

- Repair methods may include replacing the ambient air temperature sensor, repairing or replacing damaged wiring, cleaning or securing electrical connections, or resetting the trouble codes with a scan tool after repairs.

6. Is it possible to reset OBDII code B0159 GMC without fixing the underlying issue?

- While you can clear the trouble codes temporarily, the code is likely to return if the root cause of the issue, such as a faulty sensor or wiring problem, is not addressed.

7. Can extreme weather conditions affect the ambient air temperature sensor and trigger OBDII code B0159 GMC?

- Yes, extreme heat or cold can impact the sensor's performance and accuracy, potentially leading to the triggering of code B0159 GMC.

8. How much does it typically cost to repair OBDII code B0159 GMC at a mechanic or dealership?

- The cost of repairs for this code can vary depending on the specific issue and labor rates, but it may range from around $100 to $300 or more, including parts and labor.

9. Are there any preventive maintenance tips to avoid OBDII code B0159 GMC?

- Regularly inspecting and cleaning the ambient air temperature sensor, as well as checking the wiring and connections for any signs of damage, can help prevent issues that may trigger this trouble code.

10. Can OBDII code B0159 GMC affect the vehicle's emissions or cause it to fail an emissions test?

- While this code is more related to ambient air temperature sensing, unresolved issues with the sensor or related components could potentially impact emissions and cause the vehicle to fail an emissions test.