Lost Communication With Restraints Occupant Classification Module
What does U0170 mean?
The U0170 code means the vehicle's onboard diagnostic system has detected: Lost Communication With Restraints Occupant Classification Module. This is a critical severity code.
Common Symptoms
- Airbag warning light illuminated
- Passenger airbag off indicator stays on
- Seat belt reminder malfunction
- SRS system fault message displayed
- Airbags may not deploy correctly in a crash
Probable Causes (Ranked by Likelihood)
- Failed occupant classification sensor in passenger seat Very High
- Damaged wiring under passenger seat High
- Connector unplugged due to seat adjustment Moderate
- Failed occupant classification module Moderate
Step-by-Step Diagnostic Procedure
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Check the connector under the passenger seat for being unplugged
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Inspect wiring harness under the seat for damage from seat track movement
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Verify the occupant classification sensor mat in the seat cushion
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Scan the SRS module for additional related codes
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Check if the passenger airbag off indicator responds to placing weight on the seat
Frequently Asked Questions
Can I drive with code U0170?
Drive only short distances. The passenger airbag may not deploy correctly in a crash, creating a serious safety risk for front seat passengers.
What causes U0170?
The most common cause is a damaged occupant classification sensor mat in the passenger seat or a disconnected wiring harness from seat track movement.
Is U0170 expensive to fix?
Costs range from $200 to $800. A reconnected wire is a cheap fix while sensor mat or module replacement is more expensive.