OBD Guide
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U1077

Invalid Or Missing Data For Primary Id

U1077 is an OBD-II diagnostic trouble code meaning: Invalid Or Missing Data For Primary Id. Common causes: damage to the can bus, open or shorted wiring harness. 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
  • Reduced engine performance
  • Disabling some vehicle systems
  • Problems with diagnostics via scanner

Causes

  • Damage to the CAN bus
  • Open or shorted wiring harness
  • Malfunction of the electronic control unit
  • Problems with module power supply
  • Contact corrosion

How to Fix

  1. Check the integrity of the CAN bus
  2. Inspect the wiring harness for damage
  3. Check power supply and grounding of modules
  4. Scan all modules for errors
  5. Replace the faulty control unit if necessary

Related codes

U1000U1078U1088

FAQ

What does the U1077 code mean?

U1077 is an OBD-II diagnostic trouble code that indicates: Invalid Or Missing Data For Primary Id

What causes a U1077 error code?

The most common causes of U1077 include: Damage to the CAN bus; Open or shorted wiring harness; Malfunction of the electronic control unit; Problems with module power supply.

How do I fix a U1077 diagnostic trouble code?

To fix U1077: Check the integrity of the CAN bus. Inspect the wiring harness for damage. Check power supply and grounding of modules. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1077?

Yes, but get it checked soon

How much does it cost to fix U1077?

The estimated repair cost for U1077 is $17–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat