U0073: Control Module Communication Bus Off
U0073 is an OBD-II diagnostic trouble code meaning “Control Module Communication Bus Off.” A control module has lost communication with the CAN bus network. Multiple systems may be affected. According to Au7o's database, this code appears across 1 vehicle models from 1 manufacturers, with repair costs ranging from $400 to $1,600. Full vehicle-specific causes and solutions at au7o.io.
Common Causes
Typical Repair Cost
Range based on 2 documented vehicle-specific issues. Actual cost depends on the root cause, your vehicle, and whether you DIY or visit a shop.
Diagnostic Tools
To diagnose U0073, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Vehicles Affected by U0073
Click any vehicle to see the full issue details, symptoms, and repair guide.
Related Codes
Frequently Asked Questions
What does U0073 mean?
U0073 stands for "Control Module Communication Bus Off." A control module has lost communication with the CAN bus network. Multiple systems may be affected.
What are the most common causes of U0073?
The most common causes of U0073 are: CAN bus wiring damage, Faulty CAN bus terminating resistor, Module failure pulling down bus, Corroded splice or connector, After-market accessory interfering. The specific cause varies by vehicle — Au7o documents vehicle-specific causes for 1 models.
How much does it cost to fix U0073?
Repair costs for U0073 range from $400 to $1,600, depending on the specific vehicle and root cause. Some fixes like cleaning a MAF sensor are under $50, while others like replacing a catalytic converter can exceed $2,000.
Which vehicles are affected by U0073?
Au7o has documented U0073 across 1 vehicle models from 1 manufacturers: Chevrolet. See the full list below for vehicle-specific causes and repair costs.
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