U0137: Lost Communication With Trailer Brake Control Module
Severity
Medium
System
Network Communication
What Does U0137 Mean?
U0137 is a diagnostic trouble code indicating: Lost Communication With Trailer Brake Control Module. This code relates to the network communication system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.
Symptoms of U0137
- ⚠️ Check Engine Light (MIL) illuminated
- ⚠️ No communication with Trailer Brake Control Module
- ⚠️ Multiple warning lights may illuminate simultaneously
- ⚠️ Related system completely inoperative
- ⚠️ Multiple warning lights on dashboard
Common Causes
- 🔍 CAN bus wiring fault (open or shorted) to Trailer Brake Control Module
- 🔍 Power or ground supply issue to Trailer Brake Control Module
- 🔍 Trailer Brake Control Module internal failure
- 🔍 Water intrusion damaging module or connectors
- 🔍 CAN bus termination resistor fault
Frequently Asked Questions
What does U0137 mean?
U0137 indicates: Lost Communication With Trailer Brake Control Module. The vehicle's computer has detected that the Trailer Brake Control Module is not operating within its expected parameters and stored this diagnostic trouble code.
Can I drive with code U0137?
You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with U0137 for extended periods may cause additional problems.
How much does it cost to fix U0137?
Repair costs for U0137 typically range from $80 to $1200, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.
What To Do Next
Possible Fixes
- 🔧 Inspect CAN bus wiring to Trailer Brake Control Module for damage
- 🔧 Check power and ground supply to Trailer Brake Control Module
- 🔧 Replace failed Trailer Brake Control Module
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1
Find your vehicle above
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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.
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