Lost Communication With Seat Memory Module A
The U0178 code means the vehicle's onboard diagnostic system has detected: Lost Communication With Seat Memory Module A. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $150 - $600 (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
- Seat memory function not working
- Saved seat positions not recalling
- Memory seat buttons unresponsive
- Mirrors may not adjust with seat memory
- Driver profile selection not functioning
Probable Causes (Ranked by Likelihood)
- Failed seat memory module Very High
- Damaged wiring under the driver seat High
- Corroded connector at seat memory module Moderate
- Seat track motor encoder failure Low
Step-by-Step Diagnostic Procedure
-
Check the seat memory fuse in the interior fuse box
-
Inspect wiring under the driver seat for damage from seat movement
-
Verify power and ground at the seat memory module connector
-
Check CAN bus communication at the module
-
Try manual seat adjustment to verify the seat motors still work
Frequently Asked Questions
Can I drive with code U0178?
Yes, completely safe to drive. The seat can still be adjusted manually. Only the memory recall feature is unavailable.
What causes U0178?
Most commonly a failed seat memory module or damaged wiring under the driver seat. Wires can chafe from seat track movement over time.
Is U0178 expensive to fix?
Typically $150 to $600. Wiring repairs are less expensive while module replacement with programming is on the higher end.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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