B0158:05 Code - Ambient Air Temperature Sensor Circuit High Voltage/Open
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
- B0158:05 indicates Ambient Air Temperature Sensor Circuit High Voltage/Open.
- 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.
Code B0158:05 Description
What are the Possible Causes of the DTC B0158:05?
- 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 B0158:05?
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.
Code Tech Notes
B0158:05 Ambient Air Temperature Sensor Circuit High Voltage/Open
User Submitted Video
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B0158:05 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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Frequently Asked Questions about B0158:05 Code
No Frequently Asked Questions about B0158:05 Code found.
Discuss the causes and fixes for B0158:05 OBDII Code
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I have a Buick 2020 encore preferred I have replaced the ambient temperature sensor and purchased a new wiring harness. I know where the sensor is located and the connector for the sensor on the harness but do not know where the other end of the harness is supposed to be connected to. where can I find this information? The harness is routed behind the front bumper cover and then to the driver side near the battery mount but then I cannot find the mating connector.
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On the 2020 Buick Encore, the ambient temp sensor harness doesn’t run all the way back to the battery or fuse box as a single piece. It plugs into a short sub-harness behind the driver-side headlight area. That connection point is easy to miss because it’s taped to the main front-end wiring loom from the factory.
Follow the new harness you installed up the driver-side frame rail, just behind the bumper support. Look for a 2-pin connector taped or clipped to the larger wiring bundle near the headlight and washer bottle area. That’s where the ambient temp pigtail plugs in. It does not go directly into the ECM or battery junction block.
If someone replaced the bumper or the front-end was repaired in the past, that little sub-harness often gets tucked away, damaged, or cut—so take a close look for a taped-over or dangling 2-pin connector in that area.
Once the connector is matched up, clear the code and the temp reading should return to normal.
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