U0404 on 2011-2023 RAM 1500 — Invalid Data Received From Gear Shift Control Module A
1 vehicles · 1 makes · $300-$900 repair
Most Reported On
U0404 is an OBD-II diagnostic trouble code meaning “Invalid Data Received From Gear Shift Control Module A.” Sets when a module receives invalid data from Gear Shift Control Module 'A' (shift-by-wire) over the bus. Bus integrity, calibration, or module faults are typical. This code is most commonly reported on 2011-2023 RAM 1500, with repair costs ranging from $300 to $900.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
This is a network/communication code. A basic engine-code reader will not show it — you need a scanner that reads all modules. These read U0404.
One caveat that applies to every scanner: only powertrain codes are standardised across manufacturers. Body, chassis and network coverage is "enhanced" diagnostics, and how deep it goes varies by make and model year — check your specific vehicle against the tool's coverage list before buying.
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level tablet with all-system coverage and bi-directional control, so you can command a module rather than only read it.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
What you can do yourself, and what needs a shop
Reading the code, clearing it, and watching whether it returns is a driveway job with the right scanner. These steps are not:
- Module programming or software updates — needs the manufacturer software or a J2534 pass-through with a paid subscription.
- Replacing a control module — most are VIN-programmed and immobilizer-registered, so a new one does nothing until it is coded to your car.
- Airbag/SRS component work — a stored fault can deploy a live device.
If the vehicle is still under warranty, check for an open recall or technical service bulletin before buying anything — the repair may already be covered.
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
FAQ
What does U0404 mean?
U0404 stands for "Invalid Data Received From Gear Shift Control Module A." Sets when a module receives invalid data from Gear Shift Control Module 'A' (shift-by-wire) over the bus. Bus integrity, calibration, or module faults are typical.
What are the most common causes of U0404?
The most common causes of U0404 are: CAN bus wiring fault or poor ground, Weak battery / low voltage, Calibration mismatch, Failing gear shift control module. The specific cause varies by vehicle.
How much does it cost to fix U0404?
Repair costs for U0404 range from $300 to $900, depending on the vehicle and root cause.
Which vehicles are affected by U0404?
Au7o has documented U0404 across 1 vehicle models from 1 manufacturers: RAM.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.