OBD Guide
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U1143

Invalid Or Missing Data For Primary Id

U1143 is an OBD-II diagnostic trouble code meaning: Invalid Or Missing Data For Primary Id. Common causes: wiring harness damage, control module malfunction. 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
  • Unstable engine operation
  • Problems starting the engine
  • Reduced engine power
  • Errors in the operation of other vehicle systems

Causes

  • Wiring harness damage
  • Control module malfunction
  • Problems with the CAN network
  • Corrosion or poor contact in connectors
  • Software failure in the electronic control unit

How to Fix

  1. Check the integrity of the wiring harness
  2. Inspect connectors for corrosion or damage
  3. Carry out diagnostics of the CAN network
  4. Update ECU software
  5. If necessary, replace the faulty control module

Related codes

U1121U1131U1151

FAQ

What does the U1143 code mean?

U1143 is an OBD-II diagnostic trouble code that indicates: Invalid Or Missing Data For Primary Id

What causes a U1143 error code?

The most common causes of U1143 include: Wiring harness damage; Control module malfunction; Problems with the CAN network; Corrosion or poor contact in connectors.

How do I fix a U1143 diagnostic trouble code?

To fix U1143: Check the integrity of the wiring harness. Inspect connectors for corrosion or damage. Carry out diagnostics of the CAN network. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1143?

Yes, but get it checked soon

How much does it cost to fix U1143?

The estimated repair cost for U1143 is $17–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat