AutoCodes – Isuzu – P1602 Isuzu

P1602 Isuzu 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 Isuzu 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 3,075

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 May 20, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1602 Isuzu Description

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

What does this mean?

What are the Possible Causes of the DTC P1602 Isuzu?

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 Isuzu?

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 Isuzu 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 P1602 Isuzu code?

Need more information on how to fix the P1602 Isuzu 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 Isuzu Code

1. What are the common symptoms of OBDII code P1602 on an Isuzu?

The common symptoms of P1602 on an Isuzu include rough idling, stalling, poor acceleration, and illuminated Check Engine Light.

2. What does the OBDII code P1602 Isuzu indicate?

P1602 indicates that the Engine Control Module (ECM) is detecting low supply voltage from the battery.

3. What are the possible causes of OBDII code P1602 on an Isuzu?

Possible causes of P1602 include a weak or failing battery, loose or corroded battery terminals, a faulty alternator, or issues with the ECM itself.

4. How can I diagnose the OBDII code P1602 on my Isuzu?

Diagnosing P1602 may involve checking the battery voltage, inspecting battery terminals, testing the alternator output, and scanning the ECM for other related codes.

5. Can a weak battery cause OBDII code P1602 to appear on an Isuzu?

Yes, a weak battery can cause P1602 to appear as the ECM may not be receiving sufficient voltage for proper operation.

6. How can I repair OBDII code P1602 on my Isuzu?

Repairing P1602 may involve replacing the battery if it is weak, cleaning or tightening battery terminals, repairing or replacing the alternator, or reprogramming the ECM.

7. Is it safe to continue driving my Isuzu with OBDII code P1602 present?

It is not recommended to drive your Isuzu with P1602 present, as it can lead to further electrical issues and potential damage to the ECM.

8. Can a faulty alternator trigger OBDII code P1602 on an Isuzu?

Yes, a faulty alternator that is not providing sufficient voltage to the battery can trigger P1602 on an Isuzu.

9. What should I do if OBDII code P1602 keeps reappearing on my Isuzu after repairs?

If P1602 keeps reappearing, it is recommended to have a professional mechanic perform a thorough diagnosis to identify any underlying issues causing the code to persist.

10. How important is it to address OBDII code P1602 promptly on an Isuzu?

It is important to address P1602 promptly to ensure the proper functioning of the ECM and avoid potential damage to other electrical components in the vehicle.