AutoCodes – Lincoln – B105A Lincoln

B105A Lincoln Code - Cabin Temperature Sensor Fan Circuit Short

Quick Answer

The in-vehicle temperature and humidity sensor contain a thermistor and a sensing element which separately measures the in-vehicle air temperature and the humidity, then sends those readings to the FCIM. Common causes include Faulty Cabin Temperature Sensor Fan, Cabin Temperature Sensor Fan harness is open or shorted, Cabin Temperature Sensor Fan circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: B105A Lincoln indicates Cabin Temperature Sensor Fan Circuit Short.
Common causes: Common causes include Faulty Cabin Temperature Sensor Fan, Cabin Temperature Sensor Fan harness is open or shorted, Cabin Temperature Sensor Fan circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 1,029

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 18, 2024

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B105A Lincoln Description

The in-vehicle temperature and humidity sensor contain a thermistor and a sensing element which separately measures the in-vehicle air temperature and the humidity, then sends those readings to the FCIM. The in-vehicle temperature and humidity sensor has an electric fan within the sensor that draws in-vehicle air across the two sensing elements. The FCIM may adjust the actuator doors based on the in-vehicle temperature and humidity sensor information to maintain the desired humidity and temperature of the passenger cabin air. The Front Controls Interface Module (FCIM) monitors the Cabin Temperature Sensor Fan. The FCIM sets the OBDII code when the Cabin Temperature Sensor Fan is not to factory specifications.

OBDII Code B105A Lincoln - Cabin Temperature Sensor Fan Circuit Short - AutoCodes.com — B105A Lincoln Code - Cabin Temperature Sensor Fan Circuit Short

What does this mean?

What are the Possible Causes of the DTC B105A Lincoln?

Faulty Cabin Temperature Sensor Fan
Cabin Temperature Sensor Fan harness is open or shorted
Cabin Temperature Sensor Fan circuit poor electrical connection

How to Fix the DTC B105A Lincoln?

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 does this mean?

Code Tech Notes

B105A:12 Cabin Temperature Sensor Fan Circuit Short To Battery
B105A:14 Cabin Temperature Sensor Fan Circuit Short To Ground or Open

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B105A Lincoln 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 B105A Lincoln code?

Need more information on how to fix the B105A Lincoln code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B105A Lincoln code diagnosed by a professional: Find a repair shop in your area

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 B105A Lincoln Code

1. What does the OBDII code B105A indicate on a Lincoln vehicle?

The B105A code on a Lincoln indicates an issue with the Cabin Temperature Sensor Fan Circuit, specifically a short in the circuit.

2. What symptoms might I notice if my Lincoln has the B105A code?

Symptoms can include improper functioning of the climate control system, inability to maintain set cabin temperature, or unusual noises from the fan.

3. What can cause a B105A code in a Lincoln?

Causes of the B105A code generally include a shorted or damaged wiring in the cabin temperature sensor fan circuit, a faulty fan motor, or problems with the fan control module.

4. How is the B105A code diagnosed in a Lincoln?

Diagnosis involves using a diagnostic scanner to confirm the code, visually inspecting the wiring and components of the fan circuit, and testing the fan motor and control module with a multimeter.

5. What repairs can fix the B105A code in a Lincoln?

Repairs may include repairing or replacing damaged wires, replacing the fan motor, or replacing the fan control module, depending on the specific diagnosis.

6. Is it safe to drive a Lincoln with the B105A code active?

While it may be safe to drive for a short period, prolonged driving with an active B105A code can lead to discomfort and potential further damage to the climate control system.

7. Can the B105A code affect the overall performance of my Lincoln?

Although the B105A code primarily affects the cabin temperature control, it does not typically impact the engine performance. However, comfort inside the vehicle may be compromised.

8. How urgent is it to address a B105A code in a Lincoln?

It is moderately urgent to address this code because it affects the comfort of the vehicle's cabin. Addressing it promptly can prevent further complications in the climate control system.

9. What tools are required to diagnose the B105A code on a Lincoln?

Tools needed include an OBDII scanner, a multimeter, and basic hand tools for accessing and inspecting the wiring and components.

10. After repairing a B105A code, what steps should be taken to ensure the issue is resolved?

After repairs, clear the B105A code from the system using an OBDII scanner, then run the vehicle to ensure the climate control system operates correctly without the code reappearing.