U1096 - SCP Invalid or Missing Data for Primary Id

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

  • Faulty / intermittent ignition switch connections
  • J1850 / SCP Bus wiring intermittently open, shorted to power or ground
  • Faulty / intermittent connection at the Powertrain Control Module (PCM)
  • Faulty / intermittent connection at the Body Control Module (BCM)
  • Faulty / intermittent connection at the Instrument Panel Cluster (IPC)

Tech notes

This is typically an electrical wiring connection issue at one of the controllers being monitored by the manufacturer.
It can occur if:
Someone changes a battery while the ignition switch is left on, that is, left in the “Run” position.
Someone flashes/upgrades their engine controller – other modules unable to communicate with PCM during this process – this will set U1096 at a multitude of controllers on the vehicle – all false codes. Erase and carry on.
May need to disconnect both battery cables and touch them together for 15 seconds. Reattach battery cables, positive first, then negative and see if a soft reset helps.

When is the code detected?

When the PCM is unable to communicate with any other controller on the bus network at any time while the ignition switch is in the “Run” position.

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Engine won’t crank / cranks but fails to start
  • Instrument panel gauges inoperative
  • Power windows / door locks intermittently operate
  • May or may not be able to communicate with a scan tool / depends on problem

U1096 Description

This is a manufacturer specific fault code and can be used for several different faults, depending upon what the manufacturer wants to use it for. The Powertrain Control Module (PCM) communicates over the Serial Communication Protocol (SCP) bus network, or J1850 bus. This is a medium-speed bus communication system and is fault tolerant, which means any type of intermittent/loose connection at these controllers will cause this code to set in memory, but will still operate, provided a data path is available. When the PCM is unable to communicate with any other controller at any time while the ignition switch is turned on, code U1096 will set. This is the typical reason for this code to set.
OBDII Code U1096 - SCP Invalid or Missing Data for Primary Id - AutoCodes.com

U1096 Information for specific makes

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