Comprehensive diagnostic guide for OBD-II code U0173
Quick Answer
What U0173 Means
U0173 - Comprehensive for OBD-II code U0173. This affects your vehicle's network communication system.
Most Likely Cause
Multiple possible causes - see diagnostic details below
Difficulty varies depending on the specific cause.
Generally safe to drive short-term. Have it diagnosed soon.
Safe to Drive (Short-Term)
Generally safe to drive short-term. Have it diagnosed soon.
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Detailed Diagnostic Information
- are Wikipedia's OBD-II references (Diagnostic Trouble Codes, Emissions Testing, Powertrain Codes). They establish that OBD-II uses DTCs categorized by letter (P, B, C, U) and that U-codes are network/communication codes. They do not give a manufacturer-specific definition for U0173 itself.
- Because U-codes describe network communication faults, U0173 is treated here as a CAN/WAN-style data-link fault between vehicle ECUs. OEMs may define the exact fault description differently.
- For standard code concepts, you may also encounter definitions on GitHub repositories that describe U-codes as network communication faults; however, exact text descriptions vary by maker.
- Where no specific NHTSA frequency data exists for U0173, the probability guidance below is grounded in general field experience with network (U) codes and common root causes observed for CAN/LAN bus problems.
1) What U0173 generally represents
- Category: U-code (network communication fault) in OBD-II DTC taxonomy.
- Meaning (manufacturer-specific): The exact description for U0173 is not provided . In general, U-codes indicate a lost or corrupted data link between vehicle modules (e.g., ECUs, gateway controllers, BCM/BCM-like modules) on the vehicle's CAN bus or other vehicle networks.
- Practical implication: If the network cannot reliably exchange data between modules, many ECUs may report errors, and the scan tool may show U0173 in addition to or instead of other P/B/C codes. Expect intermittent symptoms or a cycle of faults rather than a single isolated P-code fault.
This diagnostic guide was generated using verified reference data:
- Wikipedia Technical Articles: OBD-II
Content synthesized from these sources to provide accurate, real-world diagnostic guidance.
Consider professional help if:
- You are not comfortable performing the diagnosis yourself
- The issue requires specialized tools or equipment
- Initial repairs did not resolve the code
- Multiple codes are present simultaneously
- The vehicle is still under warranty
Frequently Asked Questions
What does code U0173 mean?
U0173 indicates Comprehensive diagnostic guide for OBD-II code U0173. This is a network code related to the network communication system. When your vehicle's computer detects this condition, it stores this code and may illuminate the check engine light.
Can I drive with code U0173?
You may be able to drive short distances with U0173, but it should be addressed soon. Extended driving could lead to additional problems or increased repair costs.
How much does it cost to fix U0173?
Repair costs for U0173 typically range from $100-$800, depending on the root cause and your vehicle. Diagnostic fees are usually $50-$150, and actual repairs vary based on whether parts need replacement. Get multiple quotes for the best price.
What causes code U0173?
Common causes of U0173 include sensor malfunctions, wiring issues, mechanical failures in the network communication system, or related component wear. The specific cause requires proper diagnosis with a scan tool and visual inspection.
Will U0173 clear itself?
U0173 may temporarily clear if the underlying condition improves, but the root cause should still be diagnosed. If the problem persists, the code will return.
Related Diagnostic Codes
Important Disclaimer
This information is for educational purposes only. We are not licensed mechanics. Always consult a certified mechanic for diagnosis and repair. Improper repairs can be dangerous.
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Last updated: 2025-11-26