AutoCodes – Saab – P1604 Saab

P1604 Saab Code - Engine Control Module Defective

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: P1604 Saab indicates Engine Control Module Defective.
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 5,950

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
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1604 Saab Description

OBDII Code P1604 Saab - Engine Control Module Defective - AutoCodes.com — P1604 Saab Code - Engine Control Module Defective

What does this mean?

What are the Possible Causes of the DTC P1604 Saab?

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 P1604 Saab?

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 P1604 Saab 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 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 P1604 Saab Code

1. What are common symptoms of OBDII code P1604 in a Saab indicating a defective Engine Control Module (ECM)?

- Common symptoms include engine misfires, stalling, rough idle, loss of power, and illuminated check engine light.

2. What can cause the OBDII code P1604 to appear in a Saab?

- The code P1604 can be triggered by a faulty Engine Control Module (ECM) or issues with the wiring and connectors related to the ECM.

3. How can I diagnose the OBDII code P1604 in my Saab?

- Diagnosing the code P1604 often involves using a diagnostic scanner to read the code, checking the ECM connections, and performing a thorough inspection of the ECM for signs of damage.

4. Is it safe to continue driving my Saab with the OBDII code P1604 related to a defective Engine Control Module?

- It is not recommended to drive the vehicle with a faulty ECM as it can lead to potential safety hazards and further damage to the engine components.

5. Can I repair the Engine Control Module (ECM) myself to fix the OBDII code P1604 in my Saab?

- Repairing or replacing the ECM typically requires specialized tools and knowledge, so it is recommended to have a professional mechanic or dealership handle the repair.

6. How much does it cost to repair the OBDII code P1604 related to a defective Engine Control Module in a Saab?

- The cost of repairing the ECM can vary depending on the extent of the damage and whether the ECM can be repaired or needs to be replaced. It is advisable to get a repair estimate from a trusted mechanic.

7. Can a software update fix the OBDII code P1604 issue in a Saab with a defective Engine Control Module?

- In some cases, a software update may resolve the issue causing the code P1604, but it is recommended to consult with a professional technician to determine the best course of action.

8. How long does it take to repair the OBDII code P1604 related to a defective Engine Control Module in a Saab?

- The repair time can vary depending on the extent of the damage and the availability of parts. It is advisable to consult with the repair shop for an estimate of the repair timeline.

9. What should I do if the OBDII code P1604 keeps reappearing in my Saab after repairing the Engine Control Module?

- If the code P1604 persists after repairing the ECM, it is advisable to have the vehicle thoroughly inspected to identify any underlying issues that may be causing the problem.

10. Are there any preventive maintenance tips to avoid encountering the OBDII code P1604 related to a defective Engine Control Module in a Saab?

- To help prevent issues with the ECM, it is important to follow the manufacturer's recommended maintenance schedule, avoid water damage to the ECM, and address any electrical issues promptly.