Ambient Air Temperature Sensor Circuit B Low

Common symptoms

What you'll notice

• Check and replace the ambient air temperature sensor
• Inspect and repair any damaged wiring or connections related to the ambient air temperature sensor
• Verify and update the software or firmware of the vehicle's engine control unit (ECU)
• Check and replace the engine coolant temperature sensor if necessary
• Perform a thorough diagnostic scan to identify any other potential issues related to the ambient air temperature circuit and address them accordingly

Common causes

Most likely first

1. Faulty or malfunctioning ambient air temperature sensor
2. Loose or damaged wiring or connectors related to the ambient air temperature sensor circuit
3. Environmental factors such as extreme heat or cold affecting the ambient air temperature sensor readings
4. Engine control module (ECM) or powertrain control module (PCM) issues related to the ambient air temperature sensor circuit
5. Other related sensor or component malfunctions affecting the ambient air temperature sensor's accuracy or functionality

How to diagnose & fix

Work through it in order

1. Engine runs rough or stalls frequently
2. Poor fuel efficiency and decreased engine performance
3. Illuminated check engine light
4. Trouble starting the vehicle
5. Inaccurate readings from the vehicle's temperature gauge