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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

Try to communicate with the body control module and note which other modules still respond, to separate a module fault from a whole-bus fault

  • UNetwork
  • 1Manufacturer-specific
  • 0Network / Communication
  • 64Sequence number

What does it mean?

U1064 is a Network (CAN bus, module communications) fault code. It indicates: No Communication With Body Control Module .

Symptoms

  • Several unrelated body systems stop working at once, such as lighting, wipers, central locking and interior lamps
  • Central locking and remote key operation dead
  • Warning lamps on across the cluster and multiple communication codes in other modules
  • Vehicle may not start because the immobiliser function cannot be validated
  • Interior lights staying on or refusing to come on
  • Scan tool cannot find the body control module although other modules respond

Likely causes

  • Blown fuse or failed relay in the body control module supply
  • Water ingress into the module or its connectors, common where it is mounted low in the footwell or behind a kick panel
  • Corroded or loose ground for the body control module
  • Open circuit or short on the bus lines between the body module and the gateway
  • Internal module failure after a voltage spike, jump start or water damage
  • A short circuit in a body electrical accessory that has damaged an output driver inside the module
  • Connector damage or pushed-back pins after previous work behind the dash

How to fix it

  1. Try to communicate with the body control module and note which other modules still respond, to separate a module fault from a whole-bus fault
  2. Check all fuses and relays in the body module supply, testing them under load rather than by eye
  3. Inspect the footwell and kick panel area for water ingress, which is a frequent cause, and dry the area completely
  4. Measure supply voltage and ground at the module connectors, using voltage drop tests
  5. Inspect the connectors for corrosion, pushed-back pins and damage from previous repairs
  6. Test the bus lines to the gateway for continuity, shorts to ground and shorts to battery voltage
  7. Isolate body accessory circuits one at a time to find a short that may have damaged the module
  8. Replace and program the body control module only after supply, ground, water ingress and bus integrity have all been addressed

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.