AutoCodes – Hyundai – P1603 Hyundai

P1603 Hyundai Code - CAN Communication Bus Error

Quick Answer

A communication line exists between the Engine Control Module(ECM) and the Transaxle Control Module(TCM). Common causes include Faulty Transaxle Control Module(TCM) or Engine Control Module(ECM), Transaxle Control Module(TCM) to Engine Control Module(ECM) harness is open or shorted, Transaxle Control Module(TCM) to Engine Control Module(ECM) 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: P1603 Hyundai indicates CAN Communication Bus Error.
Common causes: Common causes include Faulty Transaxle Control Module(TCM) or Engine Control Module(ECM), Transaxle Control Module(TCM) to Engine Control Module(ECM) harness is open or shorted, Transaxle Control Module(TCM) to Engine Control Module(ECM) 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 24,380

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 May 20, 2019

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 P1603 Hyundai Description

A communication line exists between the Engine Control Module(ECM) and the Transaxle Control Module(TCM). The communication is through a Control Area Network(CAN). Without CAN communication, an independent pin and wiring is needed to receive a sensor information from a ECM. The more information to be communicated, the more wirings is required. In case of CAN communication type, all the information need to be communicated among control modules such as ECM and TCM use CAN lines.

OBDII Code P1603 Hyundai - CAN Communication Bus Error - AutoCodes.com — P1603 Hyundai Code - CAN Communication Bus Error

What does this mean?

What are the Possible Causes of the DTC P1603 Hyundai?

Faulty Transaxle Control Module(TCM) or Engine Control Module(ECM)
Transaxle Control Module(TCM) to Engine Control Module(ECM) harness is open or shorted
Transaxle Control Module(TCM) to Engine Control Module(ECM) circuit poor electrical connection

How to Fix the DTC P1603 Hyundai?

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 P1603 Hyundai 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 P1603 Hyundai code?

Need more information on how to fix the P1603 Hyundai code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1603 Hyundai 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 P1603 Hyundai Code

1. What is OBDII code P1603 in a Hyundai, and what does it indicate?

Code P1603 in a Hyundai indicates a CAN Communication Bus Error, which means there is a communication issue within the Controller Area Network (CAN) system of the vehicle.

2. What are some common symptoms of OBDII code P1603 in a Hyundai?

Common symptoms of code P1603 include intermittent or total loss of communication with various control modules, dashboard warning lights illuminating, and potential drivability issues.

3. What are the possible causes of OBDII code P1603 in a Hyundai?

Potential causes of code P1603 include faulty wiring or connections in the CAN network, a defective CAN bus module, issues with the powertrain control module (PCM), or a malfunctioning electronic control unit (ECU).

4. How can I diagnose OBDII code P1603 in my Hyundai?

Diagnosing code P1603 typically involves using a diagnostic scanner to retrieve the trouble codes and then performing a thorough inspection of the CAN system components, including wiring, connections, modules, and sensors.

5. Can I still drive my Hyundai with OBDII code P1603 present?

It is not recommended to drive your Hyundai with code P1603 present, as the communication error can impact vital systems in the vehicle. It's best to address the issue promptly to avoid potential safety risks.

6. How can I repair OBDII code P1603 in my Hyundai?

Repairing code P1603 may involve checking and repairing any damaged wiring or connections in the CAN network, replacing faulty modules or components, and clearing the trouble codes with a diagnostic scanner.

7. Is it possible to reset OBDII code P1603 in a Hyundai without fixing the underlying issue?

While you can clear the trouble code temporarily, it will likely reappear if the root cause of the communication error is not addressed. It's important to diagnose and repair the issue to prevent further problems.

8. Are there any DIY tips for troubleshooting OBDII code P1603 in a Hyundai?

DIY troubleshooting tips for code P1603 include checking for loose or damaged wiring, ensuring proper connections in the CAN system, and inspecting control modules for signs of malfunction.

9. Can extreme weather conditions affect the occurrence of OBDII code P1603 in a Hyundai?

Extreme weather conditions can potentially impact the CAN communication system in a Hyundai, leading to intermittent issues with code P1603. Ensuring proper insulation and protection of wiring can help prevent weather-related problems.

10. How can I prevent OBDII code P1603 from recurring in my Hyundai?

Regular maintenance, checking the integrity of the CAN system components, and addressing any communication errors promptly can help prevent the recurrence of code P1603 in your Hyundai.