AutoCodes – Cadillac – B390C Cadillac

B390C Cadillac Code - Long Range Radar Sensor Module

Quick Answer

After replacement, the Radar Sensor Module long range must complete an alignment procedure. Common causes include Faulty Radar Sensor Module, Radar Sensor Module harness is open or shorted, Radar Sensor Module 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: B390C Cadillac indicates Long Range Radar Sensor Module.
Common causes: Common causes include Faulty Radar Sensor Module, Radar Sensor Module harness is open or shorted, Radar Sensor Module 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 992

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 Mar 25, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B390C Cadillac Description

After replacement, the Radar Sensor Module long range must complete an alignment procedure. The alignment procedure can be completed by driving the vehicle for approximately 30 min. The Diagnostic Trouble Code (DTC) sets when the Radar Sensor Module long range was unable to complete the alignment process within approximately 30 min of drive time.

OBDII Code B390C Cadillac - Long Range Radar Sensor Module - AutoCodes.com — B390C Cadillac Code - Long Range Radar Sensor Module

What does this mean?

What are the Possible Causes of the DTC B390C Cadillac?

Faulty Radar Sensor Module
Radar Sensor Module harness is open or shorted
Radar Sensor Module circuit poor electrical connection

How to Fix the DTC B390C 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 B390C 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 B390C Cadillac code?

Need more information on how to fix the B390C Cadillac code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B390C 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 B390C Cadillac Code

1. What does the OBDII code B390C mean on a Cadillac?

The code B390C indicates an issue with the Long Range Radar Sensor Module, which is responsible for detecting objects and assisting with systems like adaptive cruise control and collision avoidance.

2. What are common symptoms of the B390C code in a Cadillac?

Common symptoms include the adaptive cruise control not functioning, warning lights on the dashboard, or reduced performance of collision avoidance systems.

3. What causes the B390C code to appear on a Cadillac?

The code can be triggered by a faulty radar sensor module, wiring issues, misalignment of the radar sensor, or software malfunctions.

4. How can I diagnose the B390C code on my Cadillac?

Diagnosis involves scanning the vehicle with an OBDII tool, inspecting the radar sensor and its wiring for damage, and checking for proper sensor alignment.

5. Can driving with the B390C code cause safety issues?

Yes, as it can impair systems like adaptive cruise control and collision avoidance, potentially increasing the risk of accidents.

6. How do you fix the B390C code on a Cadillac?

Repairs may include realigning or replacing the radar sensor module, repairing damaged wiring, or updating the vehicle's software.

7. Can the B390C code be cleared without repairing the issue?

Clearing the code without addressing the root cause may result in the code returning and the system continuing to malfunction.

8. How much does it cost to fix the B390C code on a Cadillac?

Repair costs can vary but typically range from $200 to $1,000 depending on whether the radar sensor needs replacement or just alignment.

9. Is the B390C code specific to Cadillac vehicles?

While the code B390C is commonly associated with Cadillac vehicles, similar codes may appear in other GM models with radar-based systems.

10. Can a dirty sensor cause the B390C code on a Cadillac?

Yes, dirt or debris on the radar sensor can interfere with its operation and potentially trigger the B390C code. Cleaning the sensor may resolve the issue.