OBD Guide
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U1079

Invalid Or Missing Data For Primary Id

U1079 is an OBD-II diagnostic trouble code meaning: Invalid Or Missing Data For Primary Id. Common causes: damage to the wiring harness between modules, malfunction of one of the electronic modules. Estimated repair cost: ~$167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
~$167 (est.)

Symptoms

  • Check Engine light comes on
  • Possible malfunctions in the operation of vehicle systems
  • Limitation of functionality of some systems
  • Errors in the operation of the multimedia system

Causes

  • Damage to the wiring harness between modules
  • Malfunction of one of the electronic modules
  • Software failure
  • Incorrect connection of modules after repair
  • Corrosion of contacts in connectors

How to Fix

  1. Check the integrity of the wiring harness between the modules
  2. Inspect connectors for corrosion or damage
  3. Reset the error with a scanner and check for its reappearance
  4. Update module software
  5. Diagnose a specific module transmitting incorrect data

Related codes

U1000U1080U1078

FAQ

What does the U1079 code mean?

U1079 is an OBD-II diagnostic trouble code that indicates: Invalid Or Missing Data For Primary Id

What causes a U1079 error code?

The most common causes of U1079 include: Damage to the wiring harness between modules; Malfunction of one of the electronic modules; Software failure; Incorrect connection of modules after repair.

How do I fix a U1079 diagnostic trouble code?

To fix U1079: Check the integrity of the wiring harness between the modules. Inspect connectors for corrosion or damage. Reset the error with a scanner and check for its reappearance. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1079?

Yes, but get it checked soon

How much does it cost to fix U1079?

The estimated repair cost for U1079 is ~$167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat