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SCP (J1850) Invalid or Missing Data for Primary Id

Jump to the fix

Severity

Medium

Can I keep driving?

Usually drivable, but get it diagnosed without delay.

First step

Confirm the complaint and note whether the security lamp behaves normally at ignition on

  • UNetwork
  • 1Manufacturer-specific
  • 0Network / Communication
  • 92Sequence number

What does it mean?

U1092 is a Network (CAN bus, module communications) fault code. It indicates: Loss of VTD (Pass Lock) Communication . This is a standardised OBD-II code. The technical definition is the same regardless of the make or model of vehicle, although specific causes and symptoms can vary between vehicles.

Symptoms

  • Engine cranks normally but will not start, or starts and stalls after a couple of seconds
  • Security or theft deterrent lamp on the dash, flashing or steady
  • Vehicle sometimes starts on a second or third attempt after standing
  • No fuel delivery and no spark during the failed start attempt
  • Remote start function refusing to work
  • Fault triggered by turning the steering wheel or by cold and damp weather

Likely causes

  • Faulty or worn ignition lock cylinder assembly with a damaged theft deterrent sensor
  • Damaged or chafed wiring between the theft deterrent sensor and the control module, often at the steering column flex point
  • Corroded or loose connector at the ignition lock or under the steering column
  • Fault inside the module that handles the anti-theft function, such as the body control module
  • Loss of power or a poor ground to the module that validates the theft deterrent signal
  • Bus wiring fault preventing the authorisation message from reaching the engine controller
  • Aftermarket alarm, remote start or immobiliser bypass wiring interfering with the circuit

How to fix it

  1. Confirm the complaint and note whether the security lamp behaves normally at ignition on
  2. Read codes from the body control module and the engine controller to see which side reports the lost authorisation
  3. Wiggle the harness at the base of the steering column while watching the theft deterrent status in live data
  4. Inspect the wiring between the ignition lock and the module for chafing, broken conductors and corroded terminals
  5. Check power and ground at the module that validates the anti-theft signal, using voltage drop tests
  6. Remove any aftermarket alarm, remote start or bypass module wiring and retest
  7. Try a known good key and check the key's transponder is correctly programmed to the vehicle
  8. Repair the harness or replace the lock cylinder assembly as the tests indicate, then perform the required relearn procedure

Codes From the Same System

All Fault Codes

Related Similar Codes

This information follows the generic OBD-II definition and does not replace a vehicle-specific diagnosis. The severity rating is rule-based; an authorised diagnostic reading is required for a definitive answer.