U0115: Lost Communication With ECM/PCM B
What Does U0115 Mean?
U0115 is a diagnostic trouble code indicating: Lost Communication With ECM/PCM B. This code relates to the network communication system. It has been reported in NHTSA complaints across 1 different vehicle models.
Symptoms of U0115
- ⚠️ Unusual vibrations
- ⚠️ Traction control system activated
Common Causes
- 🔍 Sensor or control module malfunction
Real Owner Reports
From NHTSA complaint database — actual owner descriptions.
"Component(s) Involved: Front and rear subframe/crossmember, driveline (CV axles, differential), stability and traction control system (including yaw sensor, steering angle sensor, and Accessory Gateway ECU). Available for Inspection: Yes. The vehicle is available for inspection, and I have detailed "
— Toyota Camry owner, 01/24/2024
Source: NHTSA Complaints Database
Most Reported Vehicles for U0115
Based on NHTSA owner complaint data.
| # | Vehicle | Reports |
|---|---|---|
| 1 | TOYOTA CAMRY |
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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Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
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Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
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Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.