U0001: High Speed CAN Communication Bus
What Does U0001 Mean?
U0001 is a diagnostic trouble code indicating: High Speed CAN Communication Bus. This code relates to the network communication system. It has been reported in NHTSA complaints across 9 different vehicle models.
Symptoms of U0001
- ⚠️ Check engine light illuminated
- ⚠️ Traction control system activated
- ⚠️ Vehicle enters limp/reduced power mode
- ⚠️ ABS warning light on
- ⚠️ Airbag warning light on
Common Causes
- 🔍 Sensor or control module malfunction
U0001 Reports by Year
Real Owner Reports
From NHTSA complaint database — actual owner descriptions.
"3 TIMES OVER THE LAST MONTH, WHILE I WAS DRIVING MY VEHICLE, THE CAR SUDDENLY LOST POWER WHILE I WAS DRIVING ON THE HIGHWAY. ALL THE DASHBOARD LIGHTS FLASHED ON, CHECK ENGINE LIGHT AND WARNING LIGHTS ILLUMINATED. THE VEHICLE LOST POWER, THE ACCELERATOR WAS NOT WORKING, AND I WAS JUST BARELY ABLE TO "
— Toyota Highlander owner, 11/03/2020
"THE STEERING COLUMN STARTING MAKING A LOW PITCHED WHINING SOUND FOR THE PAST 4 MONTHS. THE CAR WAS STOPPED AND PARKED AND THE WARNING CAME ON ABOUT THE SERVICING THE POWER STEERING AND NOW THE CAR HAS NO POWER STEERING. CODES: U11E8-00- & U0001-00- AND THE CAR IS NOW 1500 MILES BEYOND THE WARRAN"
— Dodge Challenger owner, 05/03/2018
"While driving all sensors began flashing simultaneously. I took to mechanic and a few codes turned up. One for speed messages. One for can bus and the other was U0001. Took to dealership service and they had it for a week. After charging battery all sensors were cleared. Same day driving home all"
— Dodge Durango owner, 09/17/2023
Source: NHTSA Complaints Database
Most Reported Vehicles for U0001
Based on NHTSA owner complaint data.
| # | Vehicle | Reports |
|---|---|---|
| 1 | JEEP CHEROKEE | |
| 2 | CHRYSLER 200 | |
| 3 | TOYOTA HIGHLANDER | |
| 4 | DODGE CHALLENGER | |
| 5 | DODGE DURANGO | |
| 6 | JEEP WRANGLER | |
| 7 | JEEP RENEGADE | |
| 8 | JEEP GLADIATOR | |
| 9 | CHRYSLER PACIFICA |
U0001 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?
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
- 🔧 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.