What Does U0119 Mean?
The PCM has lost communication with the fuel cell control module over the vehicle's data network. This applies to hydrogen fuel cell vehicles where the module manages fuel cell stack operation.
Safety Warning
Vehicle will likely not operate or enter severe limp mode. Fuel cell system malfunction may present high-voltage safety risks requiring proper training and equipment.
Common Causes
35%
Faulty fuel cell control module
30%
Damaged wiring harness or connectors to fuel cell module
20%
CAN bus communication fault or network issue
10%
Power supply or ground circuit fault to fuel cell module
5%
Software incompatibility or PCM fault
Diagnostic Steps
1
Step 1: Verify battery voltage and check all high-voltage system safety interlocks are engaged properly
2
Step 2: Inspect fuel cell control module connectors and wiring for damage, corrosion, or water intrusion
3
Step 3: Check power and ground circuits to fuel cell control module with multimeter
4
Step 4: Use scan tool to monitor CAN bus traffic and attempt direct communication with fuel cell module
5
Step 5: If module has power/ground and network is intact, replace fuel cell control module
Estimated Repair Cost
$500 - $2,500
Parts + labor, varies by vehicle and location
The PCM has lost communication with the fuel cell control module over the vehicle's data network. This applies to hydrogen fuel cell vehicles where the module manages fuel cell stack operation.
The most common cause of U0119 (Lost Communication With Fuel Cell Control Module) is: Faulty fuel cell control module
Typical repair costs for U0119 range from $500 to $2,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle will likely not operate or enter severe limp mode. Fuel cell system malfunction may present high-voltage safety risks requiring proper training and equipment.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0119 to identify the root cause.
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Quick Info
Category
Network
System
Fuel Cell Propulsion System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
