Lost Communication With Restraints Occupant Classification Module
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.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $200 - $800 (parts and labor)
Network codes mean modules are not communicating. You need a scanner that reads all systems to find the problem.
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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
-
Check the connector under the passenger seat for being unplugged
-
Inspect wiring harness under the seat for damage from seat track movement
-
Verify the occupant classification sensor mat in the seat cushion
-
Scan the SRS module for additional related codes
-
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.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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