U0073: Control Module Communication Bus A Off
What Does U0073 Mean?
U0073 is a diagnostic trouble code indicating: Control Module Communication Bus A Off. This code relates to the network communication system. It has been reported in NHTSA complaints across 9 different vehicle models.
Symptoms of U0073
- ⚠️ Check engine light illuminated
- ⚠️ Hesitation during acceleration
- ⚠️ Poor fuel economy
- ⚠️ Loss of engine power
- ⚠️ Transmission slipping
- ⚠️ Traction control system activated
Common Causes
- 🔍 Wiring or connector problem
- 🔍 Sensor or control module malfunction
U0073 Reports by Year
Real Owner Reports
From NHTSA complaint database — actual owner descriptions.
"I HAD ABS, AND BRAKE LIGHTS CAME ON. THE SPEEDOMETER, ODOMETER AND A/C HAS STOPPED WORKING WITHOUT REASON. DEALER FOUND U0073 TROUBLE CODE AND I HAD THE REPLACE ABS ACTUATOR ASSEMBLY WHICH INCLUDES ABS PUMP AND ECU. FROM THE RESEARCH THAT I MADE ONLINE, I HAVE FOUND OUT THAT MANY 07-10 CAMRY USERS H"
— Toyota Camry owner, 03/12/2014
"HERE IS A PROBLEM WITH MY TOYOTA CAMRY, 4-DOOR LE SEDAN, 2007. THE INDICATORS BRAKE AND ABS ON THE INSTRUMENT PANEL STARTED LIGHTING UP OCCASIONALLY AFTER THE FRONT BRAKE SERVICE ON 07-29-14. WHEN IT IS HAPPENING, THE TEMPERATURE GAUGE, TACHOMETER, AND SPEEDOMETER ARE MOVING QUICKLY, UP AND DOWN AND"
— Toyota Camry owner, 07/30/2014
"THE SAME YEAR AND MODEL TOYOTA CAMRY HAS ALREADY HAD A RECALL FOR THE SAME PROBLEM IN THE HYBRID VERSION FOR THE EXACT SAME PART. WHILE DRIVING THE CAR THE SPEEDOMETER GOES TO ZERO, THE TACHOMETER NEEDLE GOES UP AND DOWN LIKE CRAZY, THE AC CUTS OFF AND THE TEMPERATURE SENSOR CUTS OFF. THE PARKING BR"
— Toyota Camry owner, 07/18/2014
Source: NHTSA Complaints Database
Most Reported Vehicles for U0073
Based on NHTSA owner complaint data.
| # | Vehicle | Reports |
|---|---|---|
| 1 | TOYOTA CAMRY | |
| 2 | CHEVROLET EQUINOX | |
| 3 | CHEVROLET MALIBU | |
| 4 | CHEVROLET TRAVERSE | |
| 5 | CHEVROLET TAHOE | |
| 6 | TOYOTA PRIUS | |
| 7 | FORD FOCUS | |
| 8 | CHEVROLET SILVERADO | |
| 9 | CHEVROLET COLORADO |
U0073 Reports by Vehicle
Detailed NHTSA complaint analysis for each vehicle model.
Frequently Asked Questions
What causes communication codes?
Can a bad battery cause network codes?
Reported Repair Costs for U0073
Based on 3 owner-reported repair costs from NHTSA complaints.
⚠️ These are owner-reported costs, not estimates. Actual costs vary by location, labor rates, and root cause. Source: NHTSA complaints database.
What To Do Next
Possible Fixes
- 🔧 Have the code scanned with a professional-grade scanner to read freeze frame data
- 🔧 Test the relevant sensor(s) with a multimeter before replacing
- 🔧 Inspect wiring harness and connectors for damage, corrosion, or loose connections
- 🔧 Check battery voltage and ground connections; inspect CAN bus wiring
- 🔧 If DIY repair isn't feasible, get a diagnostic from a trusted mechanic ($50-150)
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1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
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2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
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3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.