AutoCodes – GMC – B3397 GMC

B3397 GMC Code - Left Rear Window Up Switch Circuit Low

Quick Answer

The window switch or window switch circuits that generate this Diagnostic Trouble Code (DTC) are built-in parts of the Driver Door Switch Assembly (DDSA). Common causes include Faulty Driver Door Switch Assembly (DDSA), Driver Door Switch Assembly (DDSA) harness is open or shorted, Driver Door Switch Assembly (DDSA) 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: B3397 GMC indicates Left Rear Window Up Switch Circuit Low.
Common causes: Common causes include Faulty Driver Door Switch Assembly (DDSA), Driver Door Switch Assembly (DDSA) harness is open or shorted, Driver Door Switch Assembly (DDSA) 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 538

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 Mar 06, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3397 GMC Description

The window switch or window switch circuits that generate this Diagnostic Trouble Code (DTC) are built-in parts of the Driver Door Switch Assembly (DDSA). There are no external circuits. The DDSA internally supplies power and ground to the contacts of each of the integral window switches. When one of the switches is operated, the switch contacts close, providing the DDSA with a specific window switch signal. The DDSA processes this signal, assigns a digital message to it, and sends the message to the appropriate Driver Door Module (DDM), Passenger Front Door Module (PDM), Left Rear Door Module (LRDM), or Right Rear Door Module (RRDM), via the class 2 serial data circuit. The door module, upon receiving the message, examines other relevant information available on the class 2 serial data line in order to determine if conditions are correct for window operation to occur. If conditions are correct, the door module applies power and ground to the associated window motor and circuits in order to move the window. If the DDSA determines that one of its built in window switches is closed for more than 15 continuous seconds, it sets the DTC.

OBDII Code B3397 GMC - Left Rear Window Up Switch Circuit Low - AutoCodes.com — B3397 GMC Code - Left Rear Window Up Switch Circuit Low

What does this mean?

What are the Possible Causes of the DTC B3397 GMC?

Faulty Driver Door Switch Assembly (DDSA)
Driver Door Switch Assembly (DDSA) harness is open or shorted
Driver Door Switch Assembly (DDSA) circuit poor electrical connection
Faulty Left Rear Door Module (LRDM)
Faulty Driver Door Module (DDM)

How to Fix the DTC B3397 GMC?

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 B3397 GMC 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 B3397 GMC Code

1. What are the common symptoms of OBDII code B3397 GMC?

- Common symptoms include the left rear window being inoperative, the window getting stuck in either the up or down position, or the window moving intermittently.

2. What could cause the OBDII code B3397 GMC to trigger?

- The code may be triggered by a fault in the left rear window switch circuit, such as a short to ground or a wiring issue.

3. How can I diagnose the cause of OBDII code B3397 GMC?

- Diagnose the code by inspecting the wiring and connections in the left rear window switch circuit, checking for any visible damage or shorts.

4. What are some possible repair tips for OBDII code B3397 GMC?

- Repair tips include repairing any damaged wiring, replacing the left rear window switch if necessary, and ensuring all connections are secure.

5. Can a DIY enthusiast fix OBDII code B3397 GMC?

- Depending on your skill level and experience with automotive electrical systems, you may be able to fix the issue yourself by following a repair manual or guide specific to your vehicle.

6. Is it safe to continue driving with OBDII code B3397 GMC unresolved?

- It is generally not recommended to continue driving with this code unresolved, as it can lead to further electrical issues or safety concerns with the left rear window.

7. How much does it typically cost to repair OBDII code B3397 GMC at a mechanic?

- Repair costs can vary depending on the extent of the issue and the labor rates of the mechanic, but expect to pay anywhere from $100 to $300 for parts and labor.

8. Can weather conditions affect the occurrence of OBDII code B3397 GMC?

- Extreme weather conditions, such as excessive heat or moisture, can sometimes exacerbate electrical issues leading to the triggering of this code.

9. Are there any recalls related to OBDII code B3397 GMC?

- It's always recommended to check with a GMC dealership or the National Highway Traffic Safety Administration (NHTSA) for any recalls or technical service bulletins related to this specific OBDII code.

10. How can I prevent OBDII code B3397 GMC from occurring in the future?

- To prevent this code from occurring in the future, regularly inspect and maintain the electrical components related to the left rear window switch, and address any issues promptly to avoid potential faults.