AutoCodes – Scion – P1602 Scion

P1602 Scion Code - Deterioration of Battery

Quick Answer

The Generator Control ECU assembly monitors battery conditions. Common causes include Faulty Battery, Battery harness is open or shorted, Battery 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 Scion indicates Deterioration of Battery.
Common causes: Common causes include Faulty Battery, Battery harness is open or shorted, Battery 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 415

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 Sep 14, 2022

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

The Generator Control ECU assembly monitors battery conditions. If the voltage drops below a certain value while the engine is running (not cranking), the generator control ECU assembly determines the battery has deteriorated and stores this Diagnostic Trouble Code (DTC). The Engine Control Module (ECM) will set the DTC when the battery capacity is abnormally low for 10 seconds or more when the engine is running (not cranking).

OBDII Code P1602 Scion - Deterioration of Battery - AutoCodes.com — P1602 Scion Code - Deterioration of Battery

What does this mean?

What are the Possible Causes of the DTC P1602 Scion?

Faulty Battery
Battery harness is open or shorted
Battery circuit poor electrical connection

How to Fix the DTC P1602 Scion?

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 Scion 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 Scion Code

1. What does the OBDII code P1602 mean on a Scion?

P1602 on a Scion indicates "Deterioration of Battery," which means the ECU has detected a voltage issue, typically caused by a weak or failing battery or a problem with the electrical system.

2. What are the common symptoms of the P1602 code on a Scion?

Common symptoms include difficulty starting the vehicle, dim or flickering lights, loss of radio presets, and potential ECU resets or malfunction.

3. What causes the P1602 code to appear on a Scion?

This code is usually caused by a weak or discharged battery, corroded or loose battery terminals, a failing alternator, or poor electrical connections.

4. Can I drive my Scion with the P1602 code?

While the car may still be drivable, ignoring the P1602 code can lead to further electrical issues or a complete failure to start, so itâ€™s best to address it promptly.

5. How do I fix the P1602 code on my Scion?

Start by checking the batteryâ€™s health and charge level. Clean and tighten the battery terminals, inspect the alternator for proper operation, and replace the battery if necessary.

6. Does the P1602 code mean I need a new battery?

Not always. The code could be triggered by loose connections, corrosion, or alternator issues, so test the battery and electrical system before replacing it.

7. How can I prevent the P1602 code from coming back?

Regularly maintain the battery by keeping terminals clean and tight, check the charging system periodically, and replace the battery when it shows signs of deterioration.

8. Will clearing the P1602 code fix the problem?

Clearing the code without addressing the underlying issue will only temporarily remove it; the code will reappear if the problem persists.

9. How do I test the battery to diagnose the P1602 code?

Use a multimeter to check the battery voltage (it should read around 12.6V when fully charged) and perform a load test to ensure it can hold a charge under stress.

10. Could a bad alternator cause the P1602 code on a Scion?

Yes, a failing alternator may not properly charge the battery, leading to low voltage and triggering the P1602 code.