U0145
Lost Communication with Restraints Control Module Auxiliary
A secondary or auxiliary airbag/restraints controller (e.g. for rear or curtain bags) has stopped responding. The airbag warning lamp lights up and parts of the restraint system may be disabled.
A secondary or auxiliary airbag/restraints controller (e.g. for rear or curtain bags) has stopped responding. The airbag warning lamp lights up and parts of the restraint system may be disabled.
Common causes
- medium
Auxiliary restraint module failed
A plausible cause — test and verify before replacing parts.
Typical part cost: $220-1650
- low
Gateway module routing CAN messages incorrectly
Less common, but worth ruling out after the more likely causes.
Typical part cost: $220-1650
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First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
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Related codes
See related trouble codes
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Frequently asked questions
What does U0145 mean?
U0145 means "Lost Communication with Restraints Control Module Auxiliary". It is a generic OBD-II code that points to a fault in the network / communication.
What are the most common causes of U0145?
auxiliary restraint module failed; gateway module routing can messages incorrectly; can terminating resistor (120 ω) drifted out of spec — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.
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