OBD Guide
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U1166

Lost Communications With Driver Seat Module

U1166 is an OBD-II diagnostic trouble code meaning: Lost Communications With Driver Seat Module. Common causes: broken or damaged wiring harness to seat module, seat control module malfunction. Estimated repair cost: $56–278.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–278 (est.)

Symptoms

  • Driver's electronic seat adjustments do not work
  • Seat position memory lost
  • Heated seat doesn't work
  • The malfunction indicator on the instrument panel may come on

Causes

  • Broken or damaged wiring harness to seat module
  • Seat control module malfunction
  • Problems with module power supply (blown fuse)
  • Corrosion of contacts or connectors
  • Problems in the car's CAN bus

How to Fix

  1. Check fuses associated with the seat system
  2. Inspect the seat module wiring harness and connectors
  3. Check power and ground on seat module
  4. Scan the CAN bus for other errors
  5. Replace the seat control module if necessary

Related codes

U1165U1167U1168

FAQ

What does the U1166 code mean?

U1166 is an OBD-II diagnostic trouble code that indicates: Lost Communications With Driver Seat Module

What causes a U1166 error code?

The most common causes of U1166 include: Broken or damaged wiring harness to seat module; Seat control module malfunction; Problems with module power supply (blown fuse); Corrosion of contacts or connectors.

How do I fix a U1166 diagnostic trouble code?

To fix U1166: Check fuses associated with the seat system. Inspect the seat module wiring harness and connectors. Check power and ground on seat module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1166?

Yes, but get it checked soon

How much does it cost to fix U1166?

The estimated repair cost for U1166 is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat