U0333
NetworkSoftware Incompatibility With Gear Shift Control Module "B"
The vehicle's onboard network has detected that Gear Shift Control Module 'B' is running software that may not match the versions expected by other modules on the communication bus.
ⓘ Information only. This page provides general educational information about fault code U0333. We do not assess the urgency or safety implications of any specific fault. That requires in-person diagnosis by a qualified mechanic. Full terms.
Recommended next steps
Whether a fault is urgent, drivable, or routine depends entirely on the cause on a specific vehicle, and that can only be determined by a qualified mechanic with diagnostic equipment. If a warning light is illuminated, the most reliable next step is professional diagnosis.
What does U0333 mean?
U0333 is a Network (CAN bus, module communications) fault code. It indicates: Software Incompatibility With Gear Shift Control Module "B".
This is a standardised OBD-II code. The technical definition is the same regardless of the make or model of vehicle, although specific causes and symptoms can vary between vehicles.
About Gearbox codes
Gearbox (transmission) codes report faults from the transmission control module: solenoid issues, fluid pressure problems, slipping clutches on dual-clutch boxes, and torque converter faults. Many trigger limp mode that locks the gearbox into a single forward gear.
U0333 is one of 643 codes in this category. Browse all Gearbox codes →
What we know about U0333 specifically
We record the SAE J2012 standardised definition and the system this code belongs to, but we have not yet published detailed driver-reported symptoms, common causes, or step-by-step diagnostic guidance for U0333.
Rather than invent that information by generating generic content from a template, we leave it out. For specific guidance, the most reliable sources are:
- •your vehicle's own service manual or manufacturer-specific technical bulletins
- •a qualified mechanic with a manufacturer-level diagnostic tool
- •a marque specialist familiar with your make and model
Codes nearby
Codes adjacent to U0333 in the U-code series. Many fault codes appear together with their neighbours because they relate to the same circuit or component.
Other Gearbox codes
Other fault codes in the same system as U0333. The ones with detailed guides have plain-English explanations, symptoms, causes, and diagnostic steps.
Spotted an issue or have something to add? Mechanics, technicians, and drivers who have first-hand experience with U0333 can submit a correction or expansion. We review every submission before publishing, mechanic submissions are prioritised.
Information only, not professional advice
The information on this page is provided for general guidance and educational purposes only. It is not a substitute for diagnosis or repair advice from a qualified mechanic. Always verify any fault before paying for repairs. carfaultcodes.co.uk accepts no liability for decisions made based on this information. Full terms →