U0100 on TOYOTA PRIUS
What U0100 Means on Your TOYOTA PRIUS
Real TOYOTA PRIUS Owner Reports (Source: NHTSA Complaints Database)
"Smog check failed because of obd bulb check failure and obdii failure. service fault codes are u0100 lost communication with ecm/pcm "a" and u0111 lost communication with battery energy control module "a." car only has 60,000 miles."
"Driving on sb hwy 35 at 74mph, master warning light came on and vehicle shut down, no electrical or engine control. pulled safely to shoulder of road. car would not restart. got out of car, locked car, unlocked car (toyota technician instructions), then car restarted."
Data from NHTSA Vehicle Complaints Database. All reports are filed by vehicle owners directly with the U.S. Department of Transportation.
Common Causes of U0100 on TOYOTA PRIUS
Percentages based on NHTSA complaint component analysis for this vehicle.
Complaint Trend by Year
What To Do Next
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1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if your vehicle is covered.
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2
Get a proper diagnosis
A code alone doesn't tell you the exact failed part. A diagnostic at a shop ($50-$150) pinpoints the root cause before you spend money on parts.
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3
Compare repair quotes
Get 2-3 quotes. Dealer vs independent shop prices often differ 30-50% for the same repair.