Network & communication
Definition only
Lights the check engine lamp
U3551: Hydrogen Tank A Valve Enable Circuit
Standardized SAE J2012 code · U35xx codes
What does U3551 mean?
Hydrogen Tank A Valve Enable Circuit: an electrical fault is present in the circuit.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Common causes
- High Enable wire open or relay failed
- Low Gateway module routing CAN messages incorrectly
- Low CAN terminating resistor (120 Ω) drifted out of spec
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of U3551 on the same make and model first.
U3551 in the community
Ask about U3551No one has posted about U3551 yet
Share your vehicle, the tool you used and what you tested — the first thread helps everyone who searches for this code.
Describe your U3551 problem