OBD Guide
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U1187

Invalid Or Missing Data For Primary Id

U1187 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 the module transmitting data. 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 Is On
  • There may be malfunctions in other vehicle systems
  • Errors in CAN bus operation
  • Reduced functionality of electronic systems

Causes

  • Damage to the wiring harness between modules
  • Malfunction of the module transmitting data
  • Problems with the CAN bus
  • Corrosion or poor contact in connectors
  • Module software failure

How to Fix

  1. Check the integrity of the wiring harness between the modules
  2. Diagnose the operation of the CAN bus
  3. Check the contacts in the connectors for corrosion
  4. Update module software
  5. Replace the faulty module if necessary

Related codes

U1188U1186U1189

FAQ

What does the U1187 code mean?

U1187 is an OBD-II diagnostic trouble code that indicates: Invalid Or Missing Data For Primary Id

What causes a U1187 error code?

The most common causes of U1187 include: Damage to the wiring harness between modules; Malfunction of the module transmitting data; Problems with the CAN bus; Corrosion or poor contact in connectors.

How do I fix a U1187 diagnostic trouble code?

To fix U1187: Check the integrity of the wiring harness between the modules. Diagnose the operation of the CAN bus. Check the contacts in the connectors for corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1187?

Yes, but get it checked soon

How much does it cost to fix U1187?

The estimated repair cost for U1187 is $17–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat