AutoCodes – Volkswagen – P1602 Volkswagen

P1602 Volkswagen Code - Engine Control Module Supply Voltage Low From Battery

Quick Answer

Battery positive voltage is supplied to the Engine Control Module (ECM) even when the ignition switch is OFF for use by the Diagnostic Trouble Code (DTC) memory and air–fuel ratio adaptive control value memory, etc. 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: P1602 Volkswagen indicates Engine Control Module Supply Voltage Low From Battery.
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 26,661

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 Volkswagen Description

OBDII Code P1602 Volkswagen - Engine Control Module Supply Voltage Low From Battery - AutoCodes.com — P1602 Volkswagen Code - Engine Control Module Supply Voltage Low From Battery

What does this mean?

What are the Possible Causes of the DTC P1602 Volkswagen?

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 P1602 Volkswagen?

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 Volkswagen 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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Need more information on how to fix the P1602 Volkswagen code? Get Access to Factory Service Manuals

Need Help with the 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 P1602 Volkswagen Code

1. What are the common symptoms of OBDII code P1602 in a Volkswagen related to the Engine Control Module Supply Voltage Low From Battery?

- Common symptoms include engine stalling, difficulty starting the vehicle, poor engine performance, and illumination of the Check Engine Light.

2. What are the possible causes of OBDII code P1602 in a Volkswagen?

- The code P1602 can be triggered by a weak or failing battery, faulty alternator, corroded battery terminals, damaged wiring, or a malfunctioning Engine Control Module (ECM).

3. How can I diagnose the cause of OBDII code P1602 in my Volkswagen?

- To diagnose the issue, you can start by checking the battery voltage, inspecting the alternator, examining the battery terminals for corrosion, and testing the wiring harness connected to the ECM.

4. What are some repair tips for fixing OBDII code P1602 in a Volkswagen?

- Repair tips include replacing the battery if it is weak or old, repairing or replacing damaged wiring, cleaning or replacing corroded battery terminals, and, if necessary, repairing or replacing the ECM.

5. Can OBDII code P1602 in a Volkswagen be fixed by simply clearing the fault code?

- Clearing the fault code may temporarily turn off the Check Engine Light, but if the underlying issue causing the code is not addressed, it is likely to reoccur.

6. Is it safe to continue driving my Volkswagen with OBDII code P1602 present?

- It is not recommended to drive the vehicle with OBDII code P1602 present, as it can lead to further damage to the engine or electrical system.

7. Can a DIY enthusiast fix OBDII code P1602 in a Volkswagen, or is professional help necessary?

- Depending on the cause of the code, some repairs related to OBDII code P1602 can be performed by DIY enthusiasts with the appropriate tools and knowledge. However, complex issues may require professional help.

8. How much does it typically cost to repair OBDII code P1602 in a Volkswagen?

- The cost of repairing OBDII code P1602 in a Volkswagen can vary widely depending on the root cause of the issue. Costs can range from replacing a battery or cleaning terminals to repairing or replacing the ECM.

9. Will disconnecting the battery reset OBDII code P1602 in a Volkswagen?

- Disconnecting the battery may reset the ECM, but it will also clear any stored data for diagnostic purposes. It is recommended to diagnose and address the root cause of the code before resetting the system.

10. How can I prevent OBDII code P1602 from occurring in my Volkswagen in the future?

- To prevent OBDII code P1602, it is important to perform regular maintenance on your vehicle, including checking the battery health, ensuring the charging system is working correctly, and keeping the electrical system in good condition.