OBD Guide
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U1103

Invalid Or Missing Data For Primary Id

U1103 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, corrosion of electronic module connectors. Estimated repair cost: ~$56.

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

Symptoms

  • Check Engine Light Is On
  • Malfunctions of electronic systems
  • Lost connection with some modules
  • Unstable engine operation
  • Diagnostic problems

Causes

  • Open or short circuit in the CAN bus
  • Corrosion of electronic module connectors
  • Problems with module power supply
  • Software errors in modules
  • Mechanical damage to wiring

How to Fix

  1. Check the integrity of the CAN bus and connections
  2. Inspect connectors for corrosion
  3. Check power and ground of modules
  4. Read error codes from all modules
  5. If necessary, reflash the modules

Related codes

U1100U1101U1102

FAQ

What does the U1103 code mean?

U1103 is an OBD-II diagnostic trouble code that indicates: Invalid Or Missing Data For Primary Id

What causes a U1103 error code?

The most common causes of U1103 include: Open or short circuit in the CAN bus; Corrosion of electronic module connectors; Problems with module power supply; Software errors in modules.

How do I fix a U1103 diagnostic trouble code?

To fix U1103: Check the integrity of the CAN bus and connections. Inspect connectors for corrosion. Check power and ground of modules. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1103?

Yes, but get it checked soon

How much does it cost to fix U1103?

The estimated repair cost for U1103 is ~$56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat