AutoCodes – Hyundai – P1638 Hyundai

P1638 Hyundai Code - Engine Control Module Malfunction

Quick Answer

P1638 Hyundai indicates Engine Control Module Malfunction. Common causes include Faulty Engine Control Module (ECM), Engine Control Module (ECM) harness is open or shorted, 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: P1638 Hyundai indicates Engine Control Module Malfunction.
Common causes: Common causes include Faulty Engine Control Module (ECM), Engine Control Module (ECM) harness is open or shorted, 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 7,986

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Sep 04, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1638 Hyundai Description

OBDII Code P1638 Hyundai - Engine Control Module Malfunction - AutoCodes.com — P1638 Hyundai Code - Engine Control Module Malfunction

What does this mean?

What are the Possible Causes of the DTC P1638 Hyundai?

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

How to Fix the DTC P1638 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 P1638 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 P1638 Hyundai code?

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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 P1638 Hyundai Code

1. What are the common symptoms of OBDII code P1638 in a Hyundai indicating an Engine Control Module malfunction?

The common symptoms include engine stalling, rough idling, poor acceleration, and illumination of the Check Engine Light.

2. What are the possible causes of OBDII code P1638 in a Hyundai?

The code P1638 in a Hyundai typically indicates issues with the Engine Control Module (ECM), such as damaged wiring, faulty connectors, or a malfunctioning ECM itself.

3. How can I diagnose the OBDII code P1638 in my Hyundai?

Diagnosing the code involves using a diagnostic scan tool to read the code, checking for related symptoms, inspecting the ECM wiring and connectors, and testing the ECM for any faults.

4. Can a faulty battery or alternator trigger the OBDII code P1638 in a Hyundai?

Yes, a weak or failing battery or alternator can sometimes trigger the code P1638 due to inadequate power supply to the ECM, leading to malfunctions.

5. What are the recommended repair tips for addressing OBDII code P1638 in a Hyundai?

Repair tips include checking and repairing any damaged wiring or connectors, replacing the ECM if necessary, ensuring a stable power supply to the ECM, and clearing the code after repairs.

6. Is it safe to continue driving my Hyundai with the OBDII code P1638 present?

It is not recommended to continue driving the vehicle with the code P1638, as it can lead to further engine damage or safety hazards. It is advisable to address the issue promptly.

7. Can resetting the ECM clear the OBDII code P1638 in a Hyundai?

Resetting the ECM may temporarily clear the code, but if the underlying issue causing the code is not fixed, it is likely to reappear. It is important to diagnose and address the root cause of the code.

8. How much does it typically cost to repair OBDII code P1638 in a Hyundai?

The cost of repairing the code P1638 can vary depending on the extent of the issue, the need for ECM replacement, and labor costs. It is advisable to consult a professional mechanic for an accurate estimate.

9. Can OBDII code P1638 be intermittent in a Hyundai?

Yes, the code P1638 can sometimes be intermittent, appearing and disappearing sporadically. It is essential to address the underlying issue even if the code disappears temporarily.

10. Will a Hyundai dealership be able to diagnose and repair OBDII code P1638?

Yes, Hyundai dealerships have the expertise and necessary tools to diagnose and repair OBDII code P1638 accurately. Consulting a dealership can be a good option for resolving the issue effectively.