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P1605 Saab Code - Engine Control Module Defective

Quick Answer

The P1605 diagnostic trouble code (DTC) for Saab vehicles indicates that the Engine Control Module (ECM) is defective. Common causes include Electrical issues such as wiring damage or shorts, Water intrusion into the ECM, Corrosion on the ECM connectors. 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
P1605 Saab indicates Engine Control Module Defective.
Common causes
Common causes include Electrical issues such as wiring damage or shorts, Water intrusion into the ECM, Corrosion on the ECM connectors.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1605 Saab Description

The P1605 diagnostic trouble code (DTC) for Saab vehicles indicates that the Engine Control Module (ECM) is defective. The ECM is a crucial component of the vehicle's electronic control system, responsible for managing and regulating various engine functions such as fuel injection, ignition timing, and emissions control. When the ECM is malfunctioning or defective, it can lead to a range of performance issues and potentially cause long-term damage to the vehicle.

OBDII Code P1605 Saab - Engine Control Module Defective
P1605 Saab Code - Engine Control Module Defective

Common Causes of P1605 Saab

  1. Electrical issues such as wiring damage or shorts
  2. Water intrusion into the ECM
  3. Corrosion on the ECM connectors
  4. Faulty ECM components
  5. General wear and tear on the ECM

Symptoms of P1605 Saab

  1. Check engine light is illuminated on the dashboard
  2. Engine misfires or runs rough
  3. Reduced engine power or acceleration
  4. Difficulty starting the vehicle
  5. Poor fuel economy

How to Fix P1605 Saab

  1. Diagnose the issue by using a scan tool to retrieve the specific DTC and pinpoint the ECM fault.
  2. Inspect the ECM connectors and wiring for any signs of damage, corrosion, or water intrusion.
  3. Test the ECM's internal circuitry and memory to identify any faulty components.
  4. Replace the defective ECM with a new or refurbished unit.
  5. Clear the DTC from the vehicle's memory and perform a test drive to ensure the issue has been resolved.

Cost to Fix P1605 Saab

The cost of repairing a defective ECM can vary depending on the make and model of the vehicle, the extent of the damage, and the labor rates at the repair shop. In general, replacing an ECM can range from $500 to $1500, including parts and labor. It is important to note that diagnostic time and labor rates can vary, so it is advisable to consult with a professional technician for a more accurate estimate.

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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 P1605 Saab Code

1. What are the common symptoms of OBDII code P1605 in a Saab indicating a defective Engine Control Module (ECM)?

The common symptoms include engine stalling, rough idling, reduced engine performance, and difficulty starting the vehicle.

2. What could cause the OBDII code P1605 in a Saab, signaling a defective ECM?

The code P1605 in a Saab is typically caused by issues such as a faulty ECM, wiring problems, or a bad ground connection.

3. How can I diagnose the OBDII code P1605 in my Saab related to a defective ECM?

Diagnosing the code P1605 involves using a diagnostic scanner to retrieve the fault code, checking the wiring and connections to the ECM, and performing a thorough inspection of the ECM itself.

4. Is it safe to continue driving my Saab with the OBDII code P1605 indicating a defective ECM?

It is not recommended to drive your Saab with a faulty ECM as it can lead to further damage to the engine or other components. It is best to have the issue addressed by a qualified mechanic.

5. Can I repair the OBDII code P1605 related to a defective ECM in my Saab myself?

While some DIY enthusiasts may attempt to replace the ECM themselves, it is recommended to seek the assistance of a professional mechanic or technician due to the complexity of the repair and the need for specialized tools and knowledge.

6. How much does it typically cost to repair the OBDII code P1605 in a Saab caused by a defective ECM?

The cost of repairing the OBDII code P1605 in a Saab can vary depending on the exact cause of the issue, but it may range from a few hundred to a few thousand dollars, including parts and labor.

7. Are there any preventative measures I can take to avoid the OBDII code P1605 related to a defective ECM in my Saab?

To prevent the code P1605 from appearing, it is essential to perform regular maintenance on your vehicle, including checking the wiring, connectors, and grounds, as well as ensuring the ECM is functioning correctly.

8. How long does it take to repair the OBDII code P1605 indicating a defective ECM in a Saab?

The repair time for the OBDII code P1605 can vary depending on the extent of the issue and the availability of parts. In some cases, it may be resolved within a few hours, while more complex repairs could take longer.

9. Can a faulty battery or alternator cause the OBDII code P1605 related to a defective ECM in a Saab?

While a faulty battery or alternator can potentially cause electrical issues, they are not typically the direct cause of the code P1605 indicating a defective ECM in a Saab.

10. Will resetting the ECM clear the OBDII code P1605 related to a defective ECM in my Saab?

Resetting the ECM may temporarily clear the code, but if the underlying issue causing the code P1605 is not addressed, it is likely to reappear. It is crucial to diagnose and repair the root cause of the problem.

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