OBD Guide
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U1A01

Telematics Control Unit Internal Malfunction

U1A01 is an OBD-II diagnostic trouble code meaning: Telematics Control Unit Internal Malfunction. Common causes: tcu software error, physical damage to the tcu module. Estimated repair cost: $111–556.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$111–556 (est.)

Symptoms

  • Lack of connection to telematics services
  • GPS or navigation system does not work
  • Emergency calls don't work
  • A warning icon may light up on your dashboard
  • Problems with remote access to the car

Causes

  • TCU software error
  • Physical damage to the TCU module
  • TCU power supply problems
  • Short circuit in TCU circuit
  • Communication errors between TCU and other modules

How to Fix

  1. Check the condition of the fuses associated with the TCU
  2. Diagnose the TCU using a scanner
  3. Update TCU software
  4. Check the integrity of the wiring harness connected to the TCU
  5. If necessary, replace the telematics control unit
  6. Repair only from an authorized dealer

Related codes

U1A00U1A02

FAQ

What does the U1A01 code mean?

U1A01 is an OBD-II diagnostic trouble code that indicates: Telematics Control Unit Internal Malfunction

What causes a U1A01 error code?

The most common causes of U1A01 include: TCU software error; Physical damage to the TCU module; TCU power supply problems; Short circuit in TCU circuit.

How do I fix a U1A01 diagnostic trouble code?

To fix U1A01: Check the condition of the fuses associated with the TCU. Diagnose the TCU using a scanner. Update TCU software. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1A01?

Yes, but get it checked soon

How much does it cost to fix U1A01?

The estimated repair cost for U1A01 is $111–556. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat