AutoCodes – Cadillac – B2590 Cadillac

B2590 Cadillac Code - Left Cornering Lamp Circuit Short To Ground

Quick Answer

The cornering lamps are activated automatically at vehicle speeds below 25 MPH (40 km/h) when the turn signal/multifunction switch is placed in either the left or right turn positions and/or when the steering angle is changed from the straight-ahead position towards the side the vehicle is turning. Common causes include Faulty Left Cornering Lamp, Left Cornering Lamp harness is open or shorted, Left Cornering Lamp 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: B2590 Cadillac indicates Left Cornering Lamp Circuit Short To Ground.
Common causes: Common causes include Faulty Left Cornering Lamp, Left Cornering Lamp harness is open or shorted, Left Cornering Lamp 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 545

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 Jan 01, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2590 Cadillac Description

The cornering lamps are activated automatically at vehicle speeds below 25 MPH (40 km/h) when the turn signal/multifunction switch is placed in either the left or right turn positions and/or when the steering angle is changed from the straight-ahead position towards the side the vehicle is turning. When the Body Control Module (BCM) detects that one of these operations has occurred, the BCM responds to the cornering lamp request by applying voltage to cornering lamp control circuit illuminating the appropriate cornering lamp in the area that the vehicle is turning. The cornering lamps are deactivated automatically when the turn signal/multifunction switch is placed in the neutral position and/or the steering angle has returned in the straight-ahead position. The cornering lamps will not operate at vehicle speeds above 25 MPH (40 km/h).

OBDII Code B2590 Cadillac - Left Cornering Lamp Circuit Short To Ground - AutoCodes.com — B2590 Cadillac Code - Left Cornering Lamp Circuit Short To Ground

What does this mean?

What are the Possible Causes of the DTC B2590 Cadillac?

Faulty Left Cornering Lamp
Left Cornering Lamp harness is open or shorted
Left Cornering Lamp circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B2590 Cadillac?

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 B2590 Cadillac 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 B2590 Cadillac code?

Need more information on how to fix the B2590 Cadillac code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2590 Cadillac 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 B2590 Cadillac Code

1. What does the OBDII code B2590 mean on a Cadillac?

B2590 indicates a short-to-ground condition in the left cornering lamp circuit, which affects the functionality of the left cornering light.

2. What are the common symptoms of the B2590 code?

Typical symptoms include the left cornering lamp not working, a warning light on the dashboard, or a message in the driver information center.

3. What causes the B2590 code to appear?

The code is usually caused by damaged wiring, corroded connectors, or a faulty left cornering lamp bulb or housing.

4. Can I still drive my Cadillac with the B2590 code?

Yes, you can drive with this code, but your left cornering lamp will not function, which could reduce visibility during turns in low-light conditions.

5. How do I diagnose the B2590 code on a Cadillac?

Start by inspecting the left cornering lamp, its wiring, and connectors for damage or corrosion. Use a multimeter to check for continuity and a short to ground.

6. How can I fix the B2590 code?

Repairs may include replacing a damaged bulb, repairing or replacing faulty wiring, or cleaning corroded connectors in the left cornering lamp circuit.

7. What tools are needed to troubleshoot the B2590 code?

A multimeter, a flashlight for visual inspections, and possibly a repair manual specific to your Cadillac model are helpful for diagnosing this issue.

8. Will clearing the B2590 code solve the issue?

Clearing the code will temporarily reset it, but the underlying issue in the left cornering lamp circuit must be fixed to prevent the code from returning.

9. Is the B2590 code specific to Cadillacs?

While the code is not exclusive to Cadillacs, its specific application to the left cornering lamp circuit may vary by manufacturer and vehicle model.

10. Should I take my Cadillac to a mechanic for the B2590 code?

If youâ€™re not comfortable diagnosing or repairing electrical issues, itâ€™s recommended to consult a professional mechanic to address the problem properly.