OBD Guide
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U1018

Invalid Or Missing Data For Primary Id

U1018 is an OBD-II diagnostic trouble code meaning: Invalid Or Missing Data For Primary Id. Common causes: damage to the can bus, malfunction of one of the electronic modules. Estimated repair cost: $6–111.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$6–111 (est.)

Symptoms

  • Check Engine Light Is On
  • Malfunctions of the car's electronic systems
  • Lost connection with some modules
  • Incorrect instrument readings
  • Problems starting the engine

Causes

  • Damage to the CAN bus
  • Malfunction of one of the electronic modules
  • Problems with module power supply
  • Corrosion or oxidation of contacts
  • Software glitches

How to Fix

  1. Check the integrity of the CAN bus
  2. Diagnose all connected modules
  3. Check power supply and grounding of modules
  4. Clean connector contacts
  5. Update module software

Related codes

U1000U1017U1019

FAQ

What does the U1018 code mean?

U1018 is an OBD-II diagnostic trouble code that indicates: Invalid Or Missing Data For Primary Id

What causes a U1018 error code?

The most common causes of U1018 include: Damage to the CAN bus; Malfunction of one of the electronic modules; Problems with module power supply; Corrosion or oxidation of contacts.

How do I fix a U1018 diagnostic trouble code?

To fix U1018: Check the integrity of the CAN bus. Diagnose all connected modules. Check power supply and grounding of modules. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1018?

Yes, but get it checked soon

How much does it cost to fix U1018?

The estimated repair cost for U1018 is $6–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat