OBD Guide
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U1212

Lost Communication With Ultrasonic Alarm Module Missing Message

U1212 is an OBD-II diagnostic trouble code meaning: Lost Communication With Ultrasonic Alarm Module Missing Message. Common causes: broken or damaged wires to the alarm module, ultrasonic alarm module malfunction. Estimated repair cost: $17–89.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–89 (est.)

Symptoms

  • Alarm not working
  • Error message on the dashboard
  • Problems with arming the car
  • False alarms
  • Lack of response to movement in the cabin

Causes

  • Broken or damaged wires to the alarm module
  • Ultrasonic alarm module malfunction
  • Problems with fuse or module power
  • Oxidation of contacts in connectors
  • ECU software error

How to Fix

  1. Check fuses associated with the alarm system
  2. Inspect the wiring harness to the module for damage
  3. Check the contacts in the alarm module connectors
  4. Test the ultrasonic alarm module
  5. If necessary, replace the alarm module

Related codes

U1213U1211U1208

FAQ

What does the U1212 code mean?

U1212 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Ultrasonic Alarm Module Missing Message

What causes a U1212 error code?

The most common causes of U1212 include: Broken or damaged wires to the alarm module; Ultrasonic alarm module malfunction; Problems with fuse or module power; Oxidation of contacts in connectors.

How do I fix a U1212 diagnostic trouble code?

To fix U1212: Check fuses associated with the alarm system. Inspect the wiring harness to the module for damage. Check the contacts in the alarm module connectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1212?

Yes, but get it checked soon

How much does it cost to fix U1212?

The estimated repair cost for U1212 is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat