AutoCodes – Scion – P1603 Scion

P1603 Scion Code - Engine Stall History

Quick Answer

After starting the engine, this Diagnostic Trouble Code (DTC) is stored when the engine stops without the ignition switch being operated. Common causes include Air Leak in Intake System, Faulty Mass Air Flow (MAF) sensor, Faulty Engine Coolant Temperature Sensor. 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: P1603 Scion indicates Engine Stall History.
Common causes: Common causes include Air Leak in Intake System, Faulty Mass Air Flow (MAF) sensor, Faulty Engine Coolant Temperature Sensor.
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 6,897

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 06, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1603 Scion Description

After starting the engine, this Diagnostic Trouble Code (DTC) is stored when the engine stops without the ignition switch being operated. With the engine running, the engine stops (the engine speed drops to 200 RPM or less) without the ignition switch being operated for 0.5 seconds or more. It is necessary to check if the vehicle has run out of fuel before performing troubleshooting, as this DTC is also stored when the engine stalls due to running out of fuel.

OBDII Code P1603 Scion - Engine Stall History - AutoCodes.com — P1603 Scion Code - Engine Stall History

What does this mean?

What are the Possible Causes of the DTC P1603 Scion?

Air Leak in Intake System
Faulty Mass Air Flow (MAF) sensor
Faulty Engine Coolant Temperature Sensor
Faulty Fuel Pump
Faulty Throttle Body Assembly
Faulty Engine Control Module (ECM)

How to Fix the DTC P1603 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 P1603 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.

Need more information about the P1603 Scion 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 P1603 Scion Code

1. What does the OBDII code P1603 mean on a Scion?

P1603 indicates "Engine Stall History," meaning the engine has experienced a stall event registered by the ECU.

2. What are the common symptoms of the P1603 code in a Scion?

Symptoms may include intermittent engine stalling, rough idling, difficulty starting the engine, or poor overall performance.

3. What causes the P1603 code to appear on a Scion?

Possible causes include a faulty crankshaft position sensor, weak or failing battery, malfunctioning fuel pump, clogged fuel injectors, or issues with the ignition system.

4. Can a low battery voltage trigger the P1603 code in a Scion?

Yes, low battery voltage or a weak battery can cause the engine to stall and trigger the P1603 code.

5. How do I diagnose the P1603 code on my Scion?

Start by checking the battery and charging system, inspect the crankshaft position sensor, test the fuel system, and look for any loose connections or damaged wiring.

6. Is it safe to drive a Scion with the P1603 code?

It is not recommended to drive with this code active, as engine stalling can occur unexpectedly and create a safety hazard.

7. How can I fix the P1603 code on a Scion?

Repairs may involve replacing a weak battery, cleaning or replacing fuel injectors, repairing wiring, or replacing a faulty crankshaft position sensor.

8. Can a dirty throttle body cause the P1603 code in a Scion?

Yes, a dirty or malfunctioning throttle body can lead to engine stalling, which might trigger the P1603 code.

9. Does the P1603 code always indicate a serious issue in a Scion?

Not necessarily. It could be caused by a simple issue like a weak battery or a loose connection, but itâ€™s important to properly diagnose the problem.

10. Will clearing the P1603 code fix the problem on my Scion?

Clearing the code may reset the ECU temporarily, but if the underlying issue isnâ€™t addressed, the code and symptoms will likely return.