OBD Guide
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U2125

Lost Communication With Telematic Unit

U2125 is an OBD-II diagnostic trouble code meaning: Lost Communication With Telematic Unit. Common causes: open or short circuit in the telematics module circuit, module power problems. Estimated repair cost: $56–222.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–222 (est.)

Symptoms

  • Error message on the dashboard
  • Remote access features don't work
  • No connection to the car's mobile app
  • Telematics system fault indication

Causes

  • Open or short circuit in the telematics module circuit
  • Module power problems
  • Malfunction of the telematics module itself
  • Problems with the CAN bus
  • Software failures in the module

How to Fix

  1. Check fuses associated with the telematics module
  2. Check the integrity of the wiring to the module
  3. Diagnose the state of the CAN bus
  4. Check module connector connections
  5. Update module software
  6. Repair only from an authorized dealer

Related codes

U2100U2120U2150

FAQ

What does the U2125 code mean?

U2125 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Telematic Unit

What causes a U2125 error code?

The most common causes of U2125 include: Open or short circuit in the telematics module circuit; Module power problems; Malfunction of the telematics module itself; Problems with the CAN bus.

How do I fix a U2125 diagnostic trouble code?

To fix U2125: Check fuses associated with the telematics module. Check the integrity of the wiring to the module. Diagnose the state of the CAN bus. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U2125?

Yes, but get it checked soon

How much does it cost to fix U2125?

The estimated repair cost for U2125 is $56–222. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat