AutoCodes – Cadillac – U18B7 Cadillac

U18B7 Cadillac Code - Lost Communication With Active Safety Control Module 2 On Chassis Expansion CAN Bus

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Active Safety Control Module 2, Active Safety Control Module 2 harness is open or shorted, Active Safety Control Module 2 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: U18B7 Cadillac indicates Lost Communication With Active Safety Control Module 2 On Chassis Expansion CAN Bus.
Common causes: Common causes include Faulty Active Safety Control Module 2, Active Safety Control Module 2 harness is open or shorted, Active Safety Control Module 2 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 467

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 Jun 09, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U18B7 Cadillac Description

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the devices. The devices have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver device as an availability indication of the transmitter device. Each message contains the identification number of the transmitter device. The Diagnostic Trouble Code (DTC) will set a supervised periodic message that includes the transmitter device availability that has not been received.

OBDII Code U18B7 Cadillac - Lost Communication With Active Safety Control Module 2 On Chassis Expansion CAN Bus - AutoCodes.com — U18B7 Cadillac Code - Lost Communication With Active Safety Control Module 2 On Chassis Expansion CAN Bus

What does this mean?

What are the Possible Causes of the DTC U18B7 Cadillac?

Faulty Active Safety Control Module 2
Active Safety Control Module 2 harness is open or shorted
Active Safety Control Module 2 circuit poor electrical connection

How to Fix the DTC U18B7 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 U18B7 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.

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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 U18B7 Cadillac Code

1. What are the common symptoms of OBDII code U18B7 in a Cadillac related to lost communication with Active Safety Control Module 2?

- Common symptoms include the malfunction indicator light (MIL) illuminating, loss of communication with safety control systems, and potential loss of certain safety features.

2. What are the possible causes of OBDII code U18B7 in a Cadillac?

- Possible causes include faulty wiring or connectors, a malfunctioning Active Safety Control Module 2, issues with the Chassis Expansion CAN Bus, or software communication errors.

3. How can I diagnose OBDII code U18B7 in a Cadillac?

- Diagnosis involves using an OBDII scanner to retrieve the specific code, checking for any additional related codes, and inspecting the wiring, connectors, and modules involved in the communication system.

4. What are some tips for repairing OBDII code U18B7 in a Cadillac?

- Repair tips may include checking and repairing any damaged wiring or connectors, ensuring proper connections to the Active Safety Control Module 2, updating software if necessary, and clearing the code after repairs.

5. Can OBDII code U18B7 in a Cadillac be fixed without professional help?

- Depending on the root cause, some simple fixes like checking connections or clearing the code may be possible for DIY enthusiasts. However, complex issues may require professional diagnosis and repair.

6. Is it safe to drive a Cadillac with OBDII code U18B7 present?

- It is generally not recommended to drive the vehicle with this code present, as it may indicate potential safety system malfunctions. It's best to address the issue promptly to ensure the proper functioning of safety features.

7. How much does it typically cost to repair OBDII code U18B7 in a Cadillac?

- Repair costs can vary widely depending on the specific cause of the code. Simple fixes like reconnecting a loose wire may be relatively inexpensive, while replacing a faulty module could be more costly.

8. Can resetting the OBDII code U18B7 clear the issue permanently?

- Resetting the code may temporarily clear the MIL, but if the underlying issue causing the communication loss is not resolved, the code is likely to reappear. It's important to diagnose and repair the root cause.

9. Are there any recalls or technical service bulletins related to OBDII code U18B7 in Cadillacs?

- It's recommended to check with a Cadillac dealership or online resources for any relevant recalls or technical service bulletins related to this specific OBDII code to see if there are known issues or solutions.

10. How can I prevent OBDII code U18B7 from occurring in my Cadillac?

- Regular maintenance, checking for loose or damaged wiring, and ensuring software updates are applied as recommended can help prevent communication issues leading to OBDII code U18B7 in your Cadillac.