U0404

Invalid Data Received From Gear Shift Control Module A

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–278 (est.)

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

U0401 U0402 U0403