U0404 Code - Invalid Data Received From Gear Shift Control Module 'A'
Quick Answer
The U0404 code indicates that the Engine Control Module (ECM) has detected invalid data from the Gear Shift Control Module 'A'. Common causes include Faulty gear shift control module, Wiring or connection issues between ECM and gear shift control module, Corroded or damaged wiring harness. 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
- U0404 indicates Invalid Data Received From Gear Shift Control Module 'A'.
- Common causes
- Common causes include Faulty gear shift control module, Wiring or connection issues between ECM and gear shift control module, Corroded or damaged wiring harness.
- 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 U0404 Description
The U0404 code indicates that the Engine Control Module (ECM) has detected invalid data from the Gear Shift Control Module 'A'. This means that there is a communication issue between the ECM and the gear shift control module, which can lead to various performance issues in the vehicle. The gear shift control module is responsible for controlling the transmission shifting process, so when communication is disrupted, it can affect the vehicle's ability to shift gears properly.
Common Causes of U0404
- Faulty gear shift control module
- Wiring or connection issues between ECM and gear shift control module
- Corroded or damaged wiring harness
- ECM software malfunction
- Electrical interference or signal disruption
Symptoms of U0404
- Erratic shifting patterns
- Transmission slippage
- Limp mode activation
- Check Engine Light illuminated
- Loss of power
How to Fix U0404
- Perform a diagnostic scan to verify the U0404 code and pinpoint the exact issue.
- Inspect wiring harness and connections for any damage or corrosion. Repair or replace as needed.
- Test the gear shift control module for proper functioning. Replace if found faulty.
- Clear the code and reset the ECM to see if the issue reoccurs.
- Test drive the vehicle to ensure proper transmission shifting and performance.
Cost to Fix U0404
The cost to repair the U0404 code can vary depending on the specific cause of the issue. The parts cost for a new gear shift control module can range from $200 to $500, while the labor cost for diagnosis and replacement can be around $150 to $300. Overall, the total repair cost can be expected to range from $350 to $800. It's recommended to consult with a professional mechanic to get an accurate estimate for your particular vehicle.
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Code U0404 Information for Specific Makes
- U0404 Chrysler — Invalid Data Received From Gear Shift Control Module 'A'
- U0404 Dodge — Invalid Data Received From Gear Shift Control Module 'A'
- U0404 Jeep — Invalid Data Received From Gear Shift Control Module 'A'
- U0404 RAM — Invalid Data Received From Gear Shift Control Module 'A'
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