AutoCodes – Hyundai – P1602 Hyundai

P1602 Hyundai Code - Serial Communication Problem with TCM

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: P1602 Hyundai indicates Serial Communication Problem with TCM.
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.

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Code Popularity 27,739

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
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Code P1602 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 P1602 Hyundai - Serial Communication Problem with TCM - AutoCodes.com — P1602 Hyundai Code - Serial Communication Problem with TCM

What does this mean?

What are the Possible Causes of the DTC P1602 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 P1602 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 P1602 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.

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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 P1602 Hyundai Code

1. What are the common symptoms of OBDII code P1602 in a Hyundai related to a serial communication problem with the TCM?

- Common symptoms include issues with shifting gears, poor engine performance, and the illumination of the check engine light.

2. What are the possible causes of OBDII code P1602 in a Hyundai indicating a serial communication problem with the TCM?

- The code may be triggered by a faulty TCM (transmission control module), damaged wiring or connectors, or communication errors between the TCM and other control modules.

3. How can I diagnose the serial communication problem with the TCM causing OBDII code P1602 in my Hyundai?

- Diagnosis involves using a diagnostic scanner to retrieve the trouble codes, checking the TCM for power and ground connections, and inspecting the wiring harness for any signs of damage.

4. Is it safe to continue driving my Hyundai with OBDII code P1602 related to a serial communication problem with the TCM?

- It is not recommended to continue driving the vehicle as unresolved communication issues between the TCM and other components can lead to further damage or safety hazards.

5. Can I reset OBDII code P1602 in my Hyundai myself, or do I need to take it to a professional mechanic?

- While you can clear the code using a diagnostic scanner, it is crucial to address the underlying communication problem with the TCM to prevent the code from reoccurring.

6. Are there any DIY repair tips for fixing the serial communication problem causing OBDII code P1602 in a Hyundai?

- DIY repair tips include checking and repairing any damaged wiring, ensuring proper connections to the TCM, and performing a thorough inspection of the communication network.

7. How much does it typically cost to repair OBDII code P1602 in a Hyundai due to a serial communication problem with the TCM?

- Repair costs can vary depending on the exact cause of the issue, but they may range from a few hundred to over a thousand dollars, including parts and labor.

8. Will fixing OBDII code P1602 related to a serial communication problem with the TCM improve the overall performance of my Hyundai?

- Yes, resolving the communication problem and ensuring proper TCM function can lead to smoother gear shifts, improved engine performance, and the elimination of warning lights.

9. Can extreme weather conditions or driving habits contribute to the occurrence of OBDII code P1602 in a Hyundai?

- While extreme conditions can potentially impact the electrical connections and components, the primary causes of the code are typically related to TCM malfunctions or communication errors.

10. Is it necessary to replace the TCM if OBDII code P1602 is triggered in a Hyundai, or can the issue be resolved through other means?

- In some cases, the issue may be resolved by repairing wiring or connectors, but if the TCM is determined to be faulty, replacement may be necessary to rectify the serial communication problem causing the code.