AutoCodes – Cadillac – U2603 Cadillac

U2603 Cadillac Code - Battery Energy Control Module Lost Communication With Hybrid/EV Battery Interface Control Module 1

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Hybrid/EV Battery Interface Control Module 1, Hybrid/EV Battery Interface Control Module 1 harness is open or shorted, Hybrid/EV Battery Interface Control Module 1 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: U2603 Cadillac indicates Battery Energy Control Module Lost Communication With Hybrid/EV Battery Interface Control Module 1.
Common causes: Common causes include Faulty Hybrid/EV Battery Interface Control Module 1, Hybrid/EV Battery Interface Control Module 1 harness is open or shorted, Hybrid/EV Battery Interface Control Module 1 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 505

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 18, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U2603 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 scan tool does not communicate the Hybrid/EV Battery Interface Control Modules 1 on Battery Energy Control Module dedicated bus.
The Diagnostic Trouble Code (DTC) will set when there is no temperature report message from Hybrid/EV Battery Interface Control Modules 1 to Battery Energy Control Module within 4s.

OBDII Code U2603 Cadillac - Battery Energy Control Module Lost Communication With Hybrid/EV Battery Interface Control Module 1 - AutoCodes.com — U2603 Cadillac Code - Battery Energy Control Module Lost Communication With Hybrid/EV Battery Interface Control Module 1

What does this mean?

What are the Possible Causes of the DTC U2603 Cadillac?

Faulty Hybrid/EV Battery Interface Control Module 1
Hybrid/EV Battery Interface Control Module 1 harness is open or shorted
Hybrid/EV Battery Interface Control Module 1 circuit poor electrical connection
Faulty Battery Energy Control Module

How to Fix the DTC U2603 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 U2603 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 U2603 Cadillac Code

1. What are the common symptoms of OBDII code U2603 in a Cadillac?

- Common symptoms include the hybrid system malfunction indicator light coming on, decreased fuel efficiency, and potential drivability issues.

2. What causes the OBDII code U2603 in a Cadillac?

- This code is typically caused by a communication breakdown between the Battery Energy Control Module and the Hybrid/EV Battery Interface Control Module 1.

3. How serious is the U2603 code in a Cadillac?

- While the vehicle may still be operable, it is important to address this issue promptly to prevent further damage to the hybrid system.

4. Can I still drive my Cadillac with the U2603 code present?

- It is not recommended to drive the vehicle with the U2603 code present, as it can lead to potential performance issues and further damage to the hybrid system.

5. How can I diagnose the U2603 code in my Cadillac?

- A professional diagnostic scan tool is typically required to diagnose the specific cause of the U2603 code in a Cadillac.

6. What are some repair tips for fixing the U2603 code in a Cadillac?

- Repair tips may include checking and repairing any damaged wiring, ensuring proper connections, and possibly replacing the Battery Energy Control Module or Hybrid/EV Battery Interface Control Module 1.

7. Is it safe to reset the OBDII code U2603 in a Cadillac without addressing the underlying issue?

- It is not recommended to simply reset the code without addressing the underlying communication issue, as it may lead to recurring problems.

8. How much does it cost to repair the U2603 code in a Cadillac?

- Repair costs can vary depending on the extent of the issue, but it may involve diagnostic fees, parts replacement, and labor costs.

9. Can a DIY enthusiast fix the U2603 code in a Cadillac?

- While some basic troubleshooting steps can be taken, diagnosing and repairing the U2603 code often requires professional expertise and tools.

10. How can I prevent the U2603 code from recurring in my Cadillac?

- Regular maintenance, such as checking and maintaining the hybrid system components, can help prevent the U2603 code from recurring in your Cadillac.