U0303

Software Incompatibility With Transfer Case Control Module

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

~$167 (est.)

Symptoms

Check Engine Light Is On
Incorrect all-wheel drive operation
The car goes into emergency mode
Errors when switching transfer case modes
Reducing power or limiting speed

Causes

Failed software update
Incompatible software version in transfer case module
Replacing a module without flashing
Data corruption in module memory
Problems with communication between modules

How to Fix

Diagnostics using a scanner to check software versions
Transfer case module software update
Flashing the main control unit (ECU)
Checking the integrity of the wiring harness between modules
Replacing the control module if necessary

Related codes

U0300 U0301 U0302