AutoCodes – Generic – B0158:02

B0158:02 Code - Ambient Air Temperature Sensor Circuit Short to Ground

Quick Answer

The Ambient Air Temperature Sensor is located behind the grille. 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: B0158:02 indicates Ambient Air Temperature Sensor Circuit Short to Ground.
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 862

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 07, 2022

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
Comments
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Code B0158:02 Description

The Ambient Air Temperature Sensor is located behind the grille. The instrument cluster monitors the ambient air temperature sensor with a low reference circuit and signal circuit. The instrument cluster monitors the voltage drop across the sensor, which is inversely proportional to temperature. When the ambient air temperature is cold, the resistance of the sensor is high. When the ambient air temperature is warm, the resistance of the sensors is low. The instrument cluster converts the voltage value to a temperature value and displays the temperature. The Diagnostic Trouble Code (DTC) will be set when the instrument cluster detects the sensor signal is more than 88°C (190°F).

OBDII Code B0158:02 - Ambient Air Temperature Sensor Circuit Short to Ground - AutoCodes.com — B0158:02 Code - Ambient Air Temperature Sensor Circuit Short to Ground

What does this mean?

What are the Possible Causes of the DTC B0158:02?

Faulty Ambient Air Temperature Sensor
Ambient Air Temperature Sensor harness is open or shorted
Ambient Air Temperature Sensor circuit poor electrical connection
Faulty Instrument Cluster

How to Fix the DTC B0158:02?

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

B0158:02 Ambient Air Temperature Sensor Circuit Short to Ground
B0158:05 Ambient Air Temperature Sensor Circuit High Voltage/Open

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B0158:02 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.