1993 Cadillac AllanteFACTORY OEM SERVICE PROCEDURE

Trouble Code Display

After diagnostics is entered, any trouble codes stored in computer memory will be displayed. Codes may be stored for the PCM, BCM, Lighting, SIR, ABS/TCS or RTD systems. Each trouble code consists of the system abbreviation (P, B, V, R, T or S), a three digit code identifier, and the letter C or H. All codes for each system are displayed together, in the order of there three digit number (lowest first i.e. P013, P014, etc.).

The final digit of the code, a "C" or an "H" is used to indicate whether the code is current or history. "C" means the fault was still present the last time the diagnostic test was run, while "H" means the failure was not present the last time the code was tested for.

If no codes are present for a system, a "NO X CODE" message (with X being the system i.e. PCM, BCM, SIR, ABS/TCS, or RTD) will be displayed. If the communication line to a component is not operating, a "NO X DATA" message will be displayed, indicating that the BCM could not communicate with that system. At any time during the display of trouble codes, if the "RESET" button on the DIC is depressed the system will exit "Service Mode" and go back to normal vehicle operation.

Factory Service Tools

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When to See a Mechanic

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

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