OBD Guide
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U1086

Invalid Or Missing Data For Primary Id

U1086 is an OBD-II diagnostic trouble code meaning: Invalid Or Missing Data For Primary Id. Common causes: damage to the can bus wiring harness, malfunction of one of the electronic modules. Estimated repair cost: $17–111.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–111 (est.)

Symptoms

  • Check Engine light comes on
  • There may be malfunctions in various vehicle systems
  • Lost connection with some modules
  • Unstable engine operation
  • Diagnostic problems

Causes

  • Damage to the CAN bus wiring harness
  • Malfunction of one of the electronic modules
  • Problems with module power supply
  • Contact corrosion
  • Software glitches

How to Fix

  1. Check the integrity of the CAN bus and connection
  2. Diagnose all connected modules
  3. Check power supply and grounding of modules
  4. Update module software
  5. Replace the faulty module if necessary

Related codes

U1087U1088U1096

FAQ

What does the U1086 code mean?

U1086 is an OBD-II diagnostic trouble code that indicates: Invalid Or Missing Data For Primary Id

What causes a U1086 error code?

The most common causes of U1086 include: Damage to the CAN bus wiring harness; Malfunction of one of the electronic modules; Problems with module power supply; Contact corrosion.

How do I fix a U1086 diagnostic trouble code?

To fix U1086: Check the integrity of the CAN bus and connection. 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 U1086?

Yes, but get it checked soon

How much does it cost to fix U1086?

The estimated repair cost for U1086 is $17–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat