AutoCodes – Generic – B1253

B1253 Code - Air Temperature Internal Sensor Circuit Short To Ground

Quick Answer

The Electronic Automatic Temperature Control (EATC) Module monitors the Air Temperature Internal Sensor. Common causes include Faulty Air Temperature Internal Sensor, Air Temperature Internal Sensor harness is open or shorted, Air Temperature Internal Sensor circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: B1253 indicates Air Temperature Internal Sensor Circuit Short To Ground.
Common causes: Common causes include Faulty Air Temperature Internal Sensor, Air Temperature Internal Sensor harness is open or shorted, Air Temperature Internal Sensor circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 8,200

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1253 Description

The Electronic Automatic Temperature Control (EATC) Module monitors the Air Temperature Internal Sensor. The EATC sets the OBDII code when the Air Temperature Internal Sensor is not to factory specifications.

OBDII Code B1253 - Air Temperature Internal Sensor Circuit Short To Ground - AutoCodes.com — B1253 Code - Air Temperature Internal Sensor Circuit Short To Ground

What does this mean?

What are the Possible Causes of the DTC B1253?

Faulty Air Temperature Internal Sensor
Air Temperature Internal Sensor harness is open or shorted
Air Temperature Internal Sensor circuit poor electrical connection
Faulty Electronic Automatic Temperature Control (EATC) Module

How to Fix the DTC B1253?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1253 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.

Need more information about the B1253 code?

Need more information on how to fix the B1253 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1253 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1253 Ford — Air Temperature Internal Sensor Circuit Short To Ground
B1253 Lincoln — Air Temperature Internal Sensor Circuit Short To Ground
B1253 Mercury — Air Temperature Internal Sensor Circuit Short To Ground

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.

Frequently Asked Questions about B1253 Code

1. What are common symptoms of OBDII code B1253 (Air Temperature Internal Sensor Circuit Short To Ground)?

- Common symptoms include inaccurate temperature readings on the vehicle's display, issues with the heating or cooling system, and possible illumination of the check engine light.

2. What causes OBDII code B1253 to trigger?

- This code is typically triggered when the air temperature internal sensor circuit shorts to ground, causing a disruption in the sensor's ability to accurately measure air temperature.

3. How can I diagnose the Air Temperature Internal Sensor Circuit Short To Ground issue?

- Diagnosis involves using a multimeter to test the sensor for continuity and shorts to ground, as well as inspecting the wiring and connections for any damage or corrosion.

4. Can I drive my vehicle with OBDII code B1253 active?

- It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to prevent potential issues with the heating or cooling systems.

5. What are the repair options for OBDII code B1253?

- Repair options include replacing the air temperature internal sensor, repairing any damaged wiring or connections, or resetting the fault code to see if it reoccurs.

6. How much does it cost to fix OBDII code B1253?

- The cost of fixing this code can vary depending on the specific cause of the issue, but it may range from $100 to $300 for parts and labor.

7. Will resetting the fault code make OBDII code B1253 go away permanently?

- Resetting the fault code may temporarily clear the check engine light, but if the underlying issue causing the code is not addressed, it is likely to reoccur.

8. Can extreme weather conditions affect the air temperature internal sensor circuit?

- Yes, extreme heat or cold can potentially impact the sensor's performance, leading to false readings and triggering OBDII code B1253.

9. Is it possible to prevent OBDII code B1253 from occurring again in the future?

- Regular maintenance checks, ensuring proper wiring connections, and addressing any issues promptly can help prevent the recurrence of this fault code.

10. Will OBDII code B1253 affect the overall performance of my vehicle?

- While this code may not directly impact the drivability of the vehicle, it can lead to issues with temperature control systems and overall comfort inside the vehicle.