OBD Guide
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U1046

Invalid Or Missing Data For Primary Id

U1046 is an OBD-II diagnostic trouble code meaning: Invalid Or Missing Data For Primary Id. Common causes: open or short circuit in the can bus, control module power problems. Estimated repair cost: $56–333.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–333 (est.)

Symptoms

  • The malfunction indicator light comes on
  • Problems with the operation of ABS/ESP systems
  • Incorrect operation of cruise control
  • Dashboard malfunctions
  • Engine power limitation

Causes

  • Open or short circuit in the CAN bus
  • Control module power problems
  • Malfunction of one of the modules (ECU, TCM, ABS, etc.)
  • Corroded wiring connectors
  • Software error in the module

How to Fix

  1. Check the integrity of the CAN bus using an oscilloscope
  2. Diagnose the power supply of all connected modules
  3. Check connections and connectors for corrosion
  4. Update module software
  5. Repair only from an authorized dealer

Related codes

U1000U0100U0121

FAQ

What does the U1046 code mean?

U1046 is an OBD-II diagnostic trouble code that indicates: Invalid Or Missing Data For Primary Id

What causes a U1046 error code?

The most common causes of U1046 include: Open or short circuit in the CAN bus; Control module power problems; Malfunction of one of the modules (ECU, TCM, ABS, etc.); Corroded wiring connectors.

How do I fix a U1046 diagnostic trouble code?

To fix U1046: Check the integrity of the CAN bus using an oscilloscope. Diagnose the power supply of all connected modules. Check connections and connectors for corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1046?

Do not drive — repair immediately

How much does it cost to fix U1046?

The estimated repair cost for U1046 is $56–333. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat