Lost Communication With Passive Restraint Control Module
What does U0117 mean?
The U0117 code means the vehicle's onboard diagnostic system has detected: Lost Communication With Passive Restraint Control Module. This is a critical severity code.
Common Symptoms
- Airbag warning light on continuously
- Seatbelt pretensioner system disabled
- Passenger airbag off indicator may be lit incorrectly
- Crash data not being recorded
- Multiple restraint system DTCs stored
Probable Causes (Ranked by Likelihood)
- Failed airbag control module (RCM/ACM) Very High
- Damaged CAN bus wiring under seats or dashboard High
- Clockspring failure in steering column Moderate
- Corroded connector at restraint control module Moderate
- Prior accident causing module damage Low
Step-by-Step Diagnostic Procedure
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Scan for DTCs in the restraint control module and body control module
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Check power supply and ground at the restraint control module
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Inspect CAN bus wiring under seats and through the dashboard harness
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Verify clockspring continuity in the steering column
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Check if the vehicle was in a prior accident that may have triggered the restraint system
Frequently Asked Questions
Can I drive with code U0117?
You can drive short distances, but be aware that your airbags and seatbelt pretensioners may not deploy in a crash. Have this repaired as soon as possible for safety.
What causes U0117?
A failed airbag control module or damaged CAN bus wiring are the most common causes. The restraint control module is typically located under the center console or under a front seat.
Will my airbags work with U0117?
No. When the restraint control module has lost communication, the airbag system is disabled. Neither the airbags nor seatbelt pretensioners will deploy in a collision.