OBD Guide
ENFRDEESPT

U1125

Invalid Or Missing Data For Primary Id

U1125 is an OBD-II diagnostic trouble code meaning: Invalid Or Missing Data For Primary Id. Common causes: problems with ecu software, damage to the can bus. Estimated repair cost: $17–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–167 (est.)

Symptoms

  • Check Engine Light Is On
  • Infotainment system malfunctions
  • Incorrect operation of some comfort systems
  • Errors in other modules
  • Intermittent electronics failures

Causes

  • Problems with ECU software
  • Damage to the CAN bus
  • Oxidation of contacts in connectors
  • Malfunction of one of the modules
  • Power failures of electronic units

How to Fix

  1. Check CAN bus connections
  2. Scan all modules for errors
  3. Update ECU software
  4. Check power supply of electronic modules
  5. Replace the faulty module if necessary

Related codes

U1126U1127U1128

FAQ

What does the U1125 code mean?

U1125 is an OBD-II diagnostic trouble code that indicates: Invalid Or Missing Data For Primary Id

What causes a U1125 error code?

The most common causes of U1125 include: Problems with ECU software; Damage to the CAN bus; Oxidation of contacts in connectors; Malfunction of one of the modules.

How do I fix a U1125 diagnostic trouble code?

To fix U1125: Check CAN bus connections. Scan all modules for errors. Update ECU software. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1125?

Yes, but get it checked soon

How much does it cost to fix U1125?

The estimated repair cost for U1125 is $17–167. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat