Lost Communication With 48V Mild Hybrid Module
The U0294 code means the vehicle's onboard diagnostic system has detected: Lost Communication With 48V Mild Hybrid Module. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $400 - $1,800 (parts and labor)
Network codes mean modules are not communicating. You need a scanner that reads all systems to find the problem.
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Common Symptoms
- 48V system warning light on
- Reduced power assist during acceleration
- Start-stop system disabled
- Regenerative braking not working
- 48V battery not charging
Probable Causes (Ranked by Likelihood)
- Failed 48V mild hybrid module Very High
- 48V battery degradation High
- CAN bus wiring fault Moderate
- 48V DC/DC converter failure Low
Step-by-Step Diagnostic Procedure
-
Check 48V battery voltage
-
Scan 48V module for codes
-
Test 48V DC/DC converter output
-
Inspect CAN bus wiring to 48V system
Frequently Asked Questions
Can I drive with U0294?
Short distances. The engine works alone but fuel economy decreases and power feels reduced.
What causes U0294?
Usually a failed 48V module or degraded 48V battery.
What is a 48V mild hybrid?
A system using a small battery and motor-generator to improve fuel economy without full hybrid capability.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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