Can I drive with U0073?

Yes, you can generally drive with U0073, but you should get it fixed within 3 days.

How much does it cost to fix U0073?

The typical repair cost for U0073 ranges from $50 to $1500, depending on the root cause and whether you go to a dealership or independent shop.

Can I fix U0073 myself?

This repair is rated as "professional-only" difficulty. This repair is best left to a professional mechanic.

The most common causes of U0073 include: CAN bus wiring fault, Module with bus-off condition, Low battery voltage. Check the diagnostic steps above for a systematic approach to identifying the root cause.

U0073 is rated as "serious" severity. This is a serious issue that should be fixed as soon as possible.

SAE Standard Definition

U0073

Control Module Communication Bus A Off

Communication bus A is not functioning, preventing module-to-module communication.

Serious Issue- Drive with caution, repair soon

Serious

Safe to drive professional-only Fix within 3 days

Estimated Cost (USD)$50 - $1,500

BudgetMajor

Estimated Labor~3 hours

This code indicates that a specific vehicle communication bus (designated as Bus A) has gone offline. When a bus fails, multiple control modules lose the ability to communicate, causing various system failures.

Symptoms

Multiple warning lights

Multiple system failures

Vehicle may not start

Instruments may be inoperative

Common Causes

CAN bus wiring fault

HIGH

A short or open in the bus wiring takes the entire bus offline.

Module with bus-off condition

HIGH

A malfunctioning module is flooding the bus with errors, causing a bus-off state.

Low battery voltage

MEDIUM

Insufficient voltage for proper CAN transceiver operation.

Step-by-Step Diagnosis

Check battery

easy

Ensure battery voltage is above 12V. Low voltage can cause CAN errors.

Tools:Multimeter

Measure CAN bus

medium

Check CAN-H to CAN-L resistance. Normal = ~60Ω. Very low = short. Very high = open.

Tools:Multimeter

Isolate faulty module

hard

Unplug modules systematically and recheck bus resistance.

Tools:Basic toolsMultimeter

Frequently Asked Questions

Summary

Category: Network
System: Network Communication
Cost Range: $50 - $1,500

Disclaimer

The information on this page is provided for general educational and reference purposes only. ErrorCodes is not a substitute for professional automotive diagnosis or repair. Diagnostic trouble codes indicate areas for further investigation and do not definitively identify the failed component. The same code can have different causes depending on your specific vehicle, its history, and conditions. Always consult a qualified, certified mechanic before performing repairs. ErrorCodes assumes no liability for any repairs made based on information found on this site.