AutoCodes – Ford – B2045 Ford

B2045 Ford Code - Left Rear Stop Lamp Circuit Open

Quick Answer

When the brake pedal is applied, the stoplamp switch routes voltage to the Smart Junction Box (SJB) and the high mounted stoplamp. Common causes include Faulty High Mounted Stoplamp, High Mounted Stoplamp harness is open or shorted, High Mounted Stoplamp 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: B2045 Ford indicates Left Rear Stop Lamp Circuit Open.
Common causes: Common causes include Faulty High Mounted Stoplamp, High Mounted Stoplamp harness is open or shorted, High Mounted Stoplamp 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 3,311

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 Feb 26, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2045 Ford Description

When the brake pedal is applied, the stoplamp switch routes voltage to the Smart Junction Box (SJB) and the high mounted stoplamp. When the SJB detects the brake pedal is applied, the SJB provides voltage to the Left (LH) and Right (RH) rear stoplamps. The Diagnostic Trouble Code (DTC) sets when the SJB detects an open from the LH rear stop/turn lamp voltage supply circuit.

OBDII Code B2045 Ford - Left Rear Stop Lamp Circuit Open - AutoCodes.com — B2045 Ford Code - Left Rear Stop Lamp Circuit Open

What does this mean?

What are the Possible Causes of the DTC B2045 Ford?

Faulty High Mounted Stoplamp
High Mounted Stoplamp harness is open or shorted
High Mounted Stoplamp circuit poor electrical connection
Faulty Bulb Holder
Faulty Smart Junction Box (SJB)

How to Fix the DTC B2045 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 B2045 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.

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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.

Frequently Asked Questions about B2045 Ford Code

1. What are the common symptoms of OBDII code B2045 on a Ford, indicating a Left Rear Stop Lamp Circuit Open?

- The most common symptoms include the left rear stop lamp not functioning, the brake light staying on continuously, or a dashboard warning light for a brake system fault.

2. What are the possible causes of the OBDII code B2045 indicating a Left Rear Stop Lamp Circuit Open in a Ford?

- The potential causes include a faulty brake light bulb, a damaged wiring harness, a poor electrical connection, or a faulty brake light switch.

3. How can I diagnose the Left Rear Stop Lamp Circuit Open issue related to OBDII code B2045 on my Ford?

- You can start by visually inspecting the left rear stop lamp bulb, checking the wiring for any breaks or damage, testing the brake light switch, and using a multimeter to measure electrical continuity.

4. Can I still drive my Ford with the OBDII code B2045 for a Left Rear Stop Lamp Circuit Open?

- While it may be legal to drive with a non-functional brake light in some places, it is highly recommended to address the issue promptly for safety reasons and to avoid potential traffic violations.

5. How can I repair the Left Rear Stop Lamp Circuit Open problem associated with OBDII code B2045 on my Ford?

- The repair process may involve replacing the faulty brake light bulb, repairing or replacing damaged wiring, ensuring proper electrical connections, or replacing a malfunctioning brake light switch.

6. Will resetting the OBDII code B2045 for a Left Rear Stop Lamp Circuit Open on my Ford make the issue disappear permanently?

- Resetting the code may temporarily turn off the warning light, but if the underlying problem, such as a faulty bulb or wiring issue, is not addressed, the code is likely to reappear.

7. Can a DIY enthusiast fix the OBDII code B2045 indicating a Left Rear Stop Lamp Circuit Open on a Ford?

- Depending on your skill level and access to tools, you may be able to diagnose and fix simpler issues like a faulty bulb or loose connection. However, complex wiring or switch problems may require professional assistance.

8. How long does it typically take to repair the Left Rear Stop Lamp Circuit Open issue linked to OBDII code B2045 on a Ford?

- The repair time can vary based on the specific cause of the problem. Simple fixes like replacing a bulb can be done quickly, while diagnosing and repairing wiring issues may take longer.

9. Are there any preventative measures to avoid encountering the OBDII code B2045 for a Left Rear Stop Lamp Circuit Open on a Ford in the future?

- Regularly checking and replacing brake light bulbs, inspecting wiring for damage, and ensuring proper electrical connections can help prevent issues leading to OBDII code B2045 in the future.