AutoCodes – KIA – P1602 KIA

P1602 KIA 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 KIA 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 11,712

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

What does this mean?

What are the Possible Causes of the DTC P1602 KIA?

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 KIA?

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 KIA 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 KIA Code

1. What are the common symptoms of OBDII code P1602 in a KIA vehicle?

- Common symptoms include transmission shifting issues, engine stalling, and the vehicle going into limp mode.

2. What does the OBDII code P1602 in a KIA indicate?

- OBDII code P1602 indicates a serial communication problem with the transmission control module (TCM).

3. What are some possible causes of OBDII code P1602 in a KIA?

- Possible causes include faulty wiring or connections between the engine control module (ECM) and TCM, a defective TCM, or software issues.

4. How can I diagnose a serial communication problem with the TCM in my KIA?

- Diagnosing this issue typically involves checking the wiring and connectors between the ECM and TCM, testing the TCM for functionality, and updating software as needed.

5. Can a DIY enthusiast repair OBDII code P1602 in a KIA?

- While some basic checks like inspecting connections can be done by a DIY enthusiast, diagnosing and repairing this issue often requires professional diagnostic equipment and expertise.

6. Is it safe to continue driving with OBDII code P1602 present in a KIA?

- It is not recommended to continue driving with this code present, as it can lead to further transmission problems and potential safety hazards.

7. How much does it typically cost to repair OBDII code P1602 in a KIA?

- The cost of repair can vary depending on the root cause of the issue, but it may involve diagnostic fees, parts replacement, and labor costs, potentially ranging from a few hundred to over a thousand dollars.

8. Can resetting the OBDII code P1602 clear the issue in a KIA?

- Resetting the code may temporarily clear the warning light, but it will not fix the underlying problem causing the serial communication issue with the TCM.

9. Are there any preventive maintenance tips to avoid OBDII code P1602 in a KIA?

- Regular vehicle maintenance, including checking and cleaning electrical connections, can help prevent issues like a serial communication problem with the TCM.

10. How long does it take to repair OBDII code P1602 in a KIA?

- The repair time can vary based on the specific cause of the issue and the availability of parts, but it may take a few hours to a full day for diagnosis and repair.