U0116: Reserved Communication Code
The U0116 diagnostic trouble code is reserved by the SAE J2012 standard and does not have an active definition in the current specification. According to SAE J2012, U01xx codes are assigned to CAN bus communication failures between electronic modules, specifically in the range U0100-U0299 for 'Lost Communication With...' a particular module. However, U0116 is not assigned to any specific module in published revisions of J2012, indicating it may be a future-use code reserved for standard expansions or a code that has become obsolete in updated versions of the standard.
1. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.
2. Most Common Causes
- The code U0116 has no active functional assignment in SAE J2012
- Outdated scan tool database may incorrectly display this code
- Diagnostic equipment reading or interpretation error
- Possible confusion with an undocumented manufacturer-specific code
- Scan tool software glitch generating a non-standard code
3. Symptoms You Will Notice
- No specific drivability issues directly linked to this code
- Check Engine Light may illuminate due to the stored code
4. Step-by-Step Diagnosis
Verify that the scan tool software is up to date
Clear the code and re-scan to see if it returns
If the code persists, check for any manufacturer-specific bulletins or updates
Inspect the vehicle's CAN bus wiring and connectors for damage or corrosion
Consult professional diagnostic resources to rule out misinterpretation
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is generally safe to drive as the code indicates a communication issue that may not affect vehicle operation. However, have it diagnosed promptly to avoid potential future problems.
How much does it cost to fix?▼
Since the code is often a false reading, the cost can be as low as $50-$100 for a diagnostic scan. If a real communication fault is found, repairs may range from $100 to $500 depending on the cause.