U0404
Invalid Data Received From Gear Shift Control Module A
U0404 is an OBD-II diagnostic trouble code meaning: Invalid Data Received From Gear Shift Control Module A. Common causes: shift module malfunction, damage to the wiring harness between modules. Estimated repair cost: $56–278.
Symptoms
- Incorrect gear shifting
- Check Engine Light Illuminates
- Transmission of the gearbox into emergency mode
- Loss of engine power
- Problems with cruise control
Causes
- Shift module malfunction
- Damage to the wiring harness between modules
- Oxidation of contacts in connectors
- TCM power supply problems
- Software errors in ECU or TCM
How to Fix
- Check TCM connections and connectors
- Scan the system for other errors
- Check the integrity of the wiring between the modules
- Update module software
- Replace the gear shift module if necessary
Related codes
Error U0404 by Vehicle Brand
FAQ
What does the U0404 code mean?
U0404 is an OBD-II diagnostic trouble code that indicates: Invalid Data Received From Gear Shift Control Module A
What causes a U0404 error code?
The most common causes of U0404 include: Shift module malfunction; Damage to the wiring harness between modules; Oxidation of contacts in connectors; TCM power supply problems.
How do I fix a U0404 diagnostic trouble code?
To fix U0404: Check TCM connections and connectors. Scan the system for other errors. Check the integrity of the wiring between the modules. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0404?
Limited driving only, diagnose soon
How much does it cost to fix U0404?
The estimated repair cost for U0404 is $56–278. Actual cost depends on your vehicle, location, and labor rates.
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