AutoCodes – Ford – B1945 Ford

B1945 Ford Code - Left Front Impact Sensor Not Mounted To Vehicle Properly/Ground Circuit Open

Quick Answer

The Air Bag Diagnostic Monitor measures resistance between circuit and reference ground. Common causes include Faulty Left Front Impact Sensor, Left Front Impact Sensor harness is open or shorted, Left Front Impact Sensor 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: B1945 Ford indicates Left Front Impact Sensor Not Mounted To Vehicle Properly/Ground Circuit Open.
Common causes: Common causes include Faulty Left Front Impact Sensor, Left Front Impact Sensor harness is open or shorted, Left Front Impact Sensor 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 1,379

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 Jul 29, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1945 Ford Description

The Air Bag Diagnostic Monitor measures resistance between circuit and reference ground. If diagnostic monitor measures difference of more than 3 ohms between ground and ground, the Diagnostic Trouble Code (DTC) B1945 will be stored in memory and AIR BAG warning light will flash. If the condition is repaired or corrected, DTC B1945 will be stored in memory.

OBDII Code B1945 Ford - Left Front Impact Sensor Not Mounted To Vehicle Properly/Ground Circuit Open - AutoCodes.com — B1945 Ford Code - Left Front Impact Sensor Not Mounted To Vehicle Properly/Ground Circuit Open

What does this mean?

What are the Possible Causes of the DTC B1945 Ford?

Faulty Left Front Impact Sensor
Left Front Impact Sensor harness is open or shorted
Left Front Impact Sensor circuit poor electrical connection
Faulty Air Bag Diagnostic Monitor

How to Fix the DTC B1945 Ford?

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 B1945 Ford 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 B1945 Ford code?

Need more information on how to fix the B1945 Ford code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1945 Ford code diagnosed by a professional: Find a repair shop in your area

Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.

Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

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 B1945 Ford Code

1. What does the OBDII code B1945 indicate on a Ford vehicle?

The B1945 code on a Ford indicates that the left front impact sensor is either not mounted to the vehicle properly or there is an issue with the ground circuit, potentially affecting the sensor's ability to function correctly.

2. What symptoms might I notice if my Ford has the B1945 code?

Symptoms of the B1945 code can include the airbag warning light being illuminated on the dashboard, potential failure of the airbag to deploy in a crash, and in some cases, no noticeable symptoms beyond the diagnostic trouble code being set.

3. What could cause the B1945 code to appear in my Ford?

Possible causes for the B1945 code include physical damage to the left front impact sensor, improper mounting or installation of the sensor, corrosion or damage to the sensor's connectors, or a break or fault in the sensor's ground circuit.

4. How can I fix the B1945 code on my Ford?

To fix the B1945 code, first inspect the left front impact sensor for any signs of damage or improper installation. Check the wiring and connectors for corrosion or damage, and ensure that the sensor is securely mounted. If the sensor or wiring is damaged, it may need to be replaced or repaired.

5. Is it safe to drive my Ford with the B1945 code?

While the vehicle can be driven, driving with the B1945 code is not advised because it involves the airbag system. The airbag may not deploy correctly in an accident, posing a risk to safety. It is best to address the issue promptly.

6. What tools are required to diagnose the B1945 code on a Ford?

Diagnosing the B1945 code typically requires a scan tool to read the code, a multimeter for checking wiring continuity and voltages, and possibly an oscilloscope to look at the signal waveforms from the sensors.

7. Can I fix the B1945 code myself or should I see a professional?

If you have experience with automotive electrical systems and access to the required diagnostic tools, you might be able to address the B1945 code yourself. However, due to the importance of the airbag system, it is often recommended to seek professional assistance.

8. How urgent is it to fix a B1945 code on a Ford?

It is quite urgent to fix the B1945 code because it relates to the vehicleâ€™s safety features, specifically the airbag system. Delaying repairs can compromise occupant safety in the event of an accident.

9. Could the B1945 code cause other issues in my Ford?

While the B1945 code specifically relates to the left front impact sensor, unresolved issues with this sensor can prevent the proper operation of the airbag system during a crash, potentially leading to increased risk of injury.

10. What preventive measures can avoid triggering the B1945 code on a Ford?

Regular maintenance and inspections can help prevent issues like the B1945 code. Ensure that all impact sensors are checked for proper mounting and wiring integrity, especially after an accident or major repair work on the vehicleâ€™s front end.