OBD2 Code U0117: Reserved CAN Bus Fault
The U0117 diagnostic trouble code is a reserved code under the SAE J2012 standard and does not have an active definition in the current specification. According to SAE J2012, codes U0100-U0299 are designated for communication issues on the CAN (Controller Area Network) bus, specifically for loss of communication with individual modules. However, U0117 is not assigned to any specific module in published J2012 revisions. This code may appear on scan tools that interpret extended ranges or in undocumented proprietary implementations.
1. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.
2. Most Common Causes
- Reserved/unassigned code in the SAE J2012 standard
- Proprietary implementation by the scan tool manufacturer
- Diagnostic software interpretation error
- Pending update of the diagnostic tool's code database
- Unspecified CAN communication failure not covered by the standard
3. Symptoms You Will Notice
- Check Engine Light may illuminate
- Possible intermittent communication issues with various modules
4. Step-by-Step Diagnosis
Verify the code with a professional-grade scan tool that uses an up-to-date database.
Check for any technical service bulletins (TSBs) related to your vehicle make and model.
Inspect CAN bus wiring and connectors for damage or corrosion if other communication codes are present.
Update the scan tool's software to the latest version to rule out interpretation errors.
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is generally safe to drive short distances, but you should have the code diagnosed promptly as it may indicate an underlying communication issue.
How much does it cost to fix?▼
Since the code is often a tool error, diagnosis may cost $50-$100. If an actual CAN bus fault is found, repairs can range from $100 to $500 depending on the issue.