1998 Oldsmobile Cutlass BaseFACTORY OEM SERVICE PROCEDURE

DTC U2005: Transmitted SPI Data Output High: Testing

  1. If BFC diagnostic system check was performed, go to next step. If BFC diagnostic system check was not performed, see procedures in BFC DIAGNOSTIC SYSTEM CHECK  .
  2. Disconnect instrument cluster Gray 24-pin connector. Disconnect BFC Pink 24-pin connector C3. Using DVOM, check voltage between BFC harness connector C3, terminal A3 (Yellow wire) and ground. If greater than zero volts exists, go to next step. If greater than zero volts does not exist, go to step 4).
  3. Repair short to battery in Yellow wire between BFC connector C3 and instrument cluster. Go to step 11).
  4. Reconnect BFC connector C3. Using scan tool, read SPI data output line. If SPI data output is HIGH, go to step 8). If SPI data output is not HIGH, go to next step.
  5. Check for a poor connection at instrument cluster connector terminal A9 (Yellow wire). If a poor connection exists, go to next step. If connection is okay, go to step 7).
  6. Repair poor connection at instrument cluster connector terminal A9 (Yellow wire). Go to step 11).
  7. Replace instrument cluster. See INSTRUMENT PANEL article. Go to step 11).
  8. Check for a poor connection at BFC connector C3, terminal A3 (Yellow wire). If a poor connection exists, go to next step. If connection is okay, go to step 10).
  9. Repair poor connection at BFC connector C3, terminal A3 (Yellow wire). Go to step 11).
  10. Replace BFC. See REMOVAL & INSTALLATION  . Go to next step.
  11. Clear DTCs. Perform BFC DIAGNOSTIC SYSTEM CHECK  .
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.