Code or symptom/

U0145

  • Network & Communication
  • Generic (SAE)
  • Safety
SeveritySeverity level 5 of 5: Stop driving.

Stop driving

Continuing to drive risks injury or major mechanical damage. Shut the engine off when it is safe to do so.

Standard definition

Lost Communication with Restraints Control Module Auxiliary

This code is in our catalogue but has not yet been through editorial review, so the guidance below is limited to what our structured data supports. We publish deeper diagnostic content only after a code has been reviewed — here is why.

In plain English

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 trouble code records what a control module measured. It does not identify which part failed. Test before replacing anything.

Can I keep driving?
Safe to drive
Continuing to drive risks injury or major mechanical damage. Shut the engine off when it is safe to do so.
Urgency
Stop driving
Will it pass emissions
Not affected
Check engine light
Varies
Symptoms you may notice
  • 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

Many vehicles show no symptom at all beyond the warning light. The absence of a symptom does not mean the fault is not real.

Likely causes
#CauseHow oftenComponent
1Auxiliary restraint module failedCommon—
2Gateway module routing CAN messages incorrectlyOccasional—
3CAN terminating resistor (120 Ω) drifted out of specOccasional—

Ordering reflects how often each cause is responsible in general, not a probability for your vehicle. Confirm by testing.

Components involved
  • Auxiliary Restraint Module
  • CAN Bus Wiring
Sources
Definition
Generic code set (SAE J2012 / ISO 15031-6) via the OBDexopen database, dedicated to the public domain under CC0-1.0.
Diagnostic guidance
Written and reviewed in-house. See our editorial policy.
Review status
Awaiting review

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