U0119

Lost Communication With Fuel Cell Control Module

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$167–556 (est.)

Symptoms

Check Engine light comes on
The car may go into emergency mode
Reduced engine power
Problems with charging a high-voltage battery
Inability to start the engine (in some cases)

Causes

Open or short circuit in the communication circuit
Fuel cell control module malfunction
Connector problems or contact corrosion
Software failure in the ECU
Module power problems

How to Fix

Check the integrity of the wiring harness and connectors
Check fuses and relays associated with the module
Scan the system for additional error codes
Check the power and ground of the control module
If necessary, replace the fuel cell control module
Repair only from an authorized dealer

Related codes

U0118 U0120 U0121