Lost Communication With Fuel Cell Control Module
What does U0193 mean?
The U0193 code means the vehicle's onboard diagnostic system has detected: Lost Communication With Fuel Cell Control Module. This is a critical severity code.
Common Symptoms
- Fuel cell system warning light illuminated
- Vehicle will not start or loses power
- Hydrogen fuel cell system fault displayed
- Reduced power or limp mode
- Multiple powertrain warning lights on
Probable Causes (Ranked by Likelihood)
- Failed fuel cell control module Very High
- Damaged high-voltage wiring to fuel cell stack High
- Fuel cell coolant system fault causing module shutdown Moderate
- Software fault requiring dealer reprogramming Moderate
Step-by-Step Diagnostic Procedure
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Do not attempt DIY diagnosis on high-voltage fuel cell systems
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Have the vehicle towed to a dealer or certified fuel cell technician
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Check for related fuel cell system codes with a compatible scan tool
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Verify coolant levels in the fuel cell cooling circuit
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Check for hydrogen leak indicators around the fuel cell stack
Frequently Asked Questions
Can I drive with code U0193?
No, do not drive. Fuel cell system faults require professional diagnosis. Have the vehicle towed to a dealer with fuel cell expertise.
What causes U0193?
Usually a failed fuel cell control module or communication fault. Fuel cell vehicles require specialized equipment and training for diagnosis.
Is U0193 expensive to fix?
Expect $500 to $3000. Fuel cell repairs are specialized and must be performed by trained technicians. Many repairs may be covered under the fuel cell warranty.