AutoCodes – Generic – B2453

B2453 Code - Auxiliary Heater Blower Fan Circuit Short to Ground

Quick Answer

The Powertrain Control Module (PCM) monitors the Auxiliary Heater Blower Fan. Common causes include Faulty Auxiliary Heater Blower Fan, Auxiliary Heater Blower Fan harness is open or shorted, Auxiliary Heater Blower Fan circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B2453 indicates Auxiliary Heater Blower Fan Circuit Short to Ground.
Common causes: Common causes include Faulty Auxiliary Heater Blower Fan, Auxiliary Heater Blower Fan harness is open or shorted, Auxiliary Heater Blower Fan circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 4,749

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Dec 08, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code B2453 Description

The Powertrain Control Module (PCM) monitors the Auxiliary Heater Blower Fan. The PCM sets the OBDII code when the Auxiliary Heater Blower Fan is not to factory specifications.

OBDII Code B2453 - Auxiliary Heater Blower Fan Circuit Short to Ground - AutoCodes.com — B2453 Code - Auxiliary Heater Blower Fan Circuit Short to Ground

What does this mean?

What are the Possible Causes of the DTC B2453?

Faulty Auxiliary Heater Blower Fan
Auxiliary Heater Blower Fan harness is open or shorted
Auxiliary Heater Blower Fan circuit poor electrical connection

How to Fix the DTC B2453?

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 B2453 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 B2453 code?

Need more information on how to fix the B2453 code? Get Access to Factory Service Manuals

Need Help with the Code?

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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.