U0303
Software Incompatibility With Transfer Case Control Module
U0303 is an OBD-II diagnostic trouble code meaning: Software Incompatibility With Transfer Case Control Module. Common causes: failed software update, incompatible software version in transfer case module. Estimated repair cost: ~$167.
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
Error U0303 by Vehicle Brand
FAQ
What does the U0303 code mean?
U0303 is an OBD-II diagnostic trouble code that indicates: Software Incompatibility With Transfer Case Control Module
What causes a U0303 error code?
The most common causes of U0303 include: Failed software update; Incompatible software version in transfer case module; Replacing a module without flashing; Data corruption in module memory.
How do I fix a U0303 diagnostic trouble code?
To fix U0303: Diagnostics using a scanner to check software versions. Transfer case module software update. Flashing the main control unit (ECU). For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0303?
Limited driving only, diagnose soon
How much does it cost to fix U0303?
The estimated repair cost for U0303 is ~$167. Actual cost depends on your vehicle, location, and labor rates.
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