B1250 OBD-II Trouble Code: Air Temperature Internal Sensor Circuit Failure

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Cost of diagnosing the B1250 code

B1250 is a diagnostic trouble code (DTC) for "Air Temperature Internal Sensor Circuit Failure". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

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B1250 code definition

The B1250 trouble code detects an error with the air temperature internal sensor.

What the B1250 code means

The B1250 code is a generic OBD-II trouble code that notes a circuit failure with the air temperature internal sensor. The air temperature internal sensor records the temperature in the interior of the vehicle, and relays the information to the climate control module. This allows the climate control module to accurately control the automatic climate control system. When the climate control module notes a malfunction in the air temperature internal sensor circuit, or fails to receive a reading from the sensor, then the B1250 trouble code will be stored.

What causes the B1250 code?

The B1250 trouble code is usually caused by:

What are the symptoms of the B1250 code?

The B1250 trouble code will usually be accompanied by an illuminated check engine soon Warning Light on the vehicle’s instrument panel. It is also likely that the automatic climate control system will not work.

How does a mechanic diagnose the B1250 code?

The B1250 code will be diagnosed with the help of an OBD-II trouble code scanner. A reputable technician can use the scanner to view the freeze frame data and assess the code. The scanner will also be used to check for the presence of any other trouble codes that have been detected. If the mechanic finds that there are multiple trouble codes present, then they will need to be inspected and repaired in the order in which they occur on the scanner. The technician will then need to reset the trouble codes, restart the vehicle, and look to see if the code still remains detected. If not, then a faulty trigger, or an intermittent error should be suspected.

If the B1250 trouble code remains detected, then the mechanic should begin with a visual inspection of all of the electrical components. Blown fuses, corroded connectors, and shorted wires will need to be replaced. If the technician notices that the damage is caused by something, such as an oil leakage, then a more thorough inspection will need to take place, as there may be a more critical component failure that needs to be addressed. If all of the electrical components are in working order, then a defective air temperature internal sensor should be suspected.

After any replacements are made, the mechanic will need to again reset the codes, restart the vehicle, and check for the presence of the B1250 code. This will help the technician be alerted as soon as the issue is resolved.

Common mistakes when diagnosing the B1250 code

The most frequently made error when diagnosing this code comes from not complying with the OBD-II trouble code diagnosis protocol. The protocol should be followed step by step at all times, as this ensures a thorough diagnosis, and no erroneous repairs.

Functional air temperature internal sensors are frequently and unnecessarily replaced, when the only issue is a damaged wire, connector, or fuse.

How serious is the B1250 code?

The B1250 trouble code will not keep a vehicle from being drivable, though it may keep the automatic climate control system from working. As with all trouble codes, it’s a good idea to have the vehicle inspected and repaired as soon as the code is detected.

What repairs can fix the B1250 code?

Repairs for the B1250 trouble code include:

Additional comments for consideration regarding the B1250 code

It is very rare for the B1250 code to signal a control module failure, so all possible causes should be thoroughly inspected before the PCM, climate control module, or body control module is condemned. If a control module is replaced, it will need to be reprogrammed.

Need help with a B1250 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

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B1250
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Michael

17 years of experience
22 reviews
Michael
17 years of experience
Kia Forte - Check Engine Light is on - Bowie, Maryland
Great experience with Michael! He expertly went over the car issues and provided information on all inspection points. Thank you!

Jonathan

25 years of experience
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Jonathan
25 years of experience
GMC Envoy - Check Engine Light is on - Atlanta, Georgia
Jonathan was amazing !!!! Incredibly friendly and extremely knowledgeable! I am very satisfied! Thank you Jonathan for making such a frustrating car situation feel like I have options now !

Jermaine

23 years of experience
101 reviews
Jermaine
23 years of experience
Saturn Ion - Check Engine Light is on - Washington, District of Columbia
Jermaine texted me to let me know that he was on his way. He was courteous and he arrived on time. Jermaine took the time to explain the problem I was having with my car and let me know that he would send a detailed report. I was more than happy with his service.

Andrew

14 years of experience
346 reviews
Andrew
14 years of experience
Toyota Echo - Check Engine Light is on - Beaverton, Oregon
Andrew arrived early, and got right to work. He knew the likely problem from my 10 second description, checked the vehicle diagnostics, and verified the diagnostics by swapping some parts and doing a quick test drive. He even showed me the OBD2 scanner output. The vehicle has over 151k miles, and Androw could easily have tried to upsell me on replacing all of the ignition coils, rather than just the faulty one, purely based on the vehicle's age -- but he didn't. He just replaced the one necessary, topped up fluids, mentioned it was time for an oil change and new tires in the back, and that was it. Everything was fixed inside of an hour, while working in the rain.


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