I think you need to go try the Snapper-On Forum , and tell them what you got  going on in your OBD1 Furd Escort or whatever

 

Hi, there are noumerous possibilytis like a faulty ecm, ecm harness is open or
shorted,or a ecm poor circuit electrical connection.check for broken or bent, pushed
out or corroded connector pins.

Integrated relay module

Hi, lost communications with ecm, check ground connection,check for poor electrical
connection, check ecm itself.

   U2105 is a communication code that usually indicates a loss of communication between the ECM and other modules. Since you're experiencing intermittent issues like power steering dropout, transmission sticking in low, and gauge failures, it sounds like a possible issue with the CAN bus wiring or connectors.

I’d suggest starting with a thorough inspection of the wiring harness, especially around areas prone to movement, wear, or exposure to heat/moisture. Check for damaged wires, corroded connectors, or loose grounds. The fact that multiple communication codes appear during the issue points to a potential shared ground or power issue affecting multiple modules.

Also, pay close attention to the battery voltage and alternator output—low voltage can sometimes cause communication errors across modules. If you can reproduce the issue, try wiggling the wiring in suspect areas to see if the problem reoccurs.

Let us know what you find!

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