OBD Guide
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U1146

Lost Communication With External Memory

U1146 is an OBD-II diagnostic trouble code meaning: Lost Communication With External Memory. Common causes: problems with the can bus, external memory module malfunction. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Multimedia systems do not work or freeze
  • Navigation problems
  • Error message on the dashboard
  • Resetting your car
  • Intermittent audio system operation

Causes

  • Problems with the CAN bus
  • External memory module malfunction
  • Poor contact in connectors
  • Wiring harness damage
  • Software failure in the ECU

How to Fix

  1. Check connections and connectors of the memory module
  2. Scan the CAN bus for errors
  3. Check the power supply to the memory module
  4. Update ECU software
  5. Replace the faulty memory module if necessary

Related codes

U1000U1121U1151

FAQ

What does the U1146 code mean?

U1146 is an OBD-II diagnostic trouble code that indicates: Lost Communication With External Memory

What causes a U1146 error code?

The most common causes of U1146 include: Problems with the CAN bus; External memory module malfunction; Poor contact in connectors; Wiring harness damage.

How do I fix a U1146 diagnostic trouble code?

To fix U1146: Check connections and connectors of the memory module. Scan the CAN bus for errors. Check the power supply to the memory module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1146?

Yes, but get it checked soon

How much does it cost to fix U1146?

The estimated repair cost for U1146 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat