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Engine-Codes - Generic - B0158

B0158 Code - Ambient Air Temperature Sensor Circuit

Repair Importance Level: 1/3
Repair Difficulty Level: 2/3  What is this?
Table of contents
What does this mean?

|B0158 code possible causes

  • 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 is the B0158 code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
What does this mean?

|B0158 code tech notes

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

|What is the cost to diagnose the B0158 code

Labor: 1.0

The cost to diagnose the B0158 code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|What are B0158 code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|What is B0158 code meaning?

Air temperature sensors allow the Heating, Ventilation, and Air Conditioning (HVAC) Control Module to monitor the temperature of the discharge air in the HVAC ducts. 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 circuit. The HVAC control module monitors the voltage drops across the air temperature sensors and uses the inputs for automatic control calculations. When the duct air temperatures are cold, the resistances of the sensors are high and the voltage signals are high. When the duct air temperatures are hot, the resistances of the sensors are low and the voltage signals are low. The HVAC control module converts the voltage values to count values where 1 volt is approximately equal to 51 counts.

|Need more information with the B0158 code?

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|B0158 code information for specific makes

|Need help with a B0158 code?

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