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Engine-Codes – Saab – P1902 Saab

P1902 Saab Code - CAN Data Bus Multifunction Control Module 2

Quick Answer

The P1902 diagnostic trouble code for Saab vehicles specifically refers to an issue with the CAN (Controller Area Network) Data Bus Multifunction Control Module 2. Common causes include Faulty Multifunction Control Module 2, Wiring or connection issues within the CAN Data Bus, Corrosion or damage to the 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
P1902 Saab indicates CAN Data Bus Multifunction Control Module 2.
Common causes
Common causes include Faulty Multifunction Control Module 2, Wiring or connection issues within the CAN Data Bus, Corrosion or damage to the 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 09, 2024
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Code P1902 Saab Description

The P1902 diagnostic trouble code for Saab vehicles specifically refers to an issue with the CAN (Controller Area Network) Data Bus Multifunction Control Module 2. The CAN Data Bus is a communication network within the vehicle that allows various control modules to communicate with each other. The Multifunction Control Module 2 is responsible for managing multiple functions within the vehicle, such as lighting, wipers, and other electrical components.

OBDII Code P1902 Saab - CAN Data Bus Multifunction Control Module 2
P1902 Saab Code - CAN Data Bus Multifunction Control Module 2

Common Causes of P1902 Saab

  1. Faulty Multifunction Control Module 2.
  2. Wiring or connection issues within the CAN Data Bus.
  3. Corrosion or damage to the connectors.
  4. Software issues within the control modules.
  5. Electrical system malfunctions.

Symptoms of P1902 Saab

  1. Malfunctioning of exterior lights or interior lighting.
  2. Intermittent operation of windshield wipers.
  3. Climate control system not functioning properly.
  4. Dashboard warning lights illuminated.
  5. Loss of communication with other control modules.

How to Fix P1902 Saab

  1. Begin by performing a thorough diagnostic scan to confirm the P1902 code and determine the exact source of the issue.
  2. Inspect the wiring and connections related to the CAN Data Bus and Multifunction Control Module 2 for any damage, corrosion, or loose connections.
  3. Test the Multifunction Control Module 2 for proper functionality and replace if necessary.
  4. Clear the code from the vehicle's computer system after the repair is completed.
  5. Conduct a final test drive to ensure that all electrical systems are functioning correctly.

Cost to Fix P1902 Saab

The typical repair costs for addressing a P1902 code related to the CAN Data Bus Multifunction Control Module 2 in a Saab vehicle can range from $200 to $500, including parts and labor. However, it is important to note that the specific diagnosis time and labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and engine type. Rates at dealerships or in metropolitan areas may be higher, while independent shops often charge less. It is recommended to obtain quotes from local shops for a more accurate estimate.

What does this mean?

Tech Notes for P1902 Saab

Multifunction control module 1 controls: headlamps, interior lamps, instrument illumination, intermittent wiper, door mirror heater, heated rear window

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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 P1902 Saab Code

1. What are common symptoms of OBDII code P1902 in a Saab related to the CAN Data Bus Multifunction Control Module 2?

The common symptoms include issues with multiple vehicle functions, such as power windows, door locks, lights, and the car's overall electrical system.

2. What are some possible causes of OBDII code P1902 in a Saab?

Possible causes include a malfunctioning multifunction control module, wiring issues, a faulty CAN data bus, or a problem with the vehicle's electrical system.

3. How can I diagnose the OBDII code P1902 in my Saab?

Diagnosing this code typically involves using a diagnostic scanner to retrieve the specific fault codes, checking the wiring and connections related to the multifunction control module, and testing the different components of the CAN data bus.

4. What are some repair tips for fixing OBDII code P1902 in a Saab?

Repair tips may include checking and repairing any damaged wiring, replacing the multifunction control module if necessary, ensuring all connections are secure, and clearing the fault codes after making repairs.

5. Can I drive my Saab with OBDII code P1902 present?

It is not recommended to drive your Saab with this code present, as it can indicate underlying issues that may affect the vehicle's performance and safety. It's best to address the problem promptly.

6. How much does it typically cost to repair OBDII code P1902 in a Saab?

The cost of repairing this code can vary depending on the exact cause of the issue, parts needed for replacement, and labor costs. It is advisable to consult a professional mechanic for an accurate estimate.

7. Is it possible to reset the OBDII code P1902 in a Saab without repairing the issue?

While you can clear the fault code using a diagnostic scanner, it is essential to address the underlying problem causing the code to prevent further issues with your vehicle's functionality.

8. Are there any recalls or technical service bulletins related to OBDII code P1902 in Saab vehicles?

It's recommended to check with your local Saab dealership or online resources for any recalls or technical service bulletins related to this specific OBDII code for your Saab model.

9. Can a DIY enthusiast without advanced automotive knowledge repair OBDII code P1902 in a Saab?

Depending on the specific cause of the code, some repairs related to OBDII code P1902 may be within reach for a DIY enthusiast with basic automotive knowledge. However, complex electrical issues may require professional assistance.

10. How can I prevent OBDII code P1902 from occurring in my Saab in the future?

Regular maintenance, checking the electrical system, and addressing any warning signs promptly can help prevent OBDII code P1902 and other related issues in your Saab.

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