1996 Cadillac Seville STSFACTORY OEM SERVICE PROCEDURE

BCM DTC Definition

BCM DTC DEFINITION

Code No. Circuit Affected
PZ1552 Loss Of PZM Keep Alive Memory (KAM)
PZ1556 PZM EEPROM Write Error
PZ1558 PZM EEPROM Checksum Error
PZ1970 Exterior Light Power Fault
PZ1971 Inadvertent Power Fault
PZ1972 Low Power Control Fault
PZ1973 High Power Control Fault
PZ1981 Battery Voltage Too Low
PZ1982 Battery Voltage Too High
PZ2016 Loss Of Serial Communications - PCM
PZ2042 Loss Of Serial Communications - ABS/TCS
PZ2056 Loss Of Serial Communications - RSS
PZ2088 Loss Of Serial Communications - SIR
PZ2096 Loss Of Serial Communications - IPC
PZ2128 Loss Of Serial Communications - IRC
PZ2152 Loss Of Serial Communications - HVAC Programmer
PZ2153 Loss Of Serial Communications - CCP
PZ2255 Generic Loss Of Serial Data (Source ID Unknown)
PZ2470 Daytime Running Lights Fault
PZ2471 Interior Lights Fault
PZ2472 Low Beam Output Fault
PZ2473 High Beam Output Fault
PZ2476 Parking Lights Output Fault
PZ2550 Storage Mode Entered
PZ2719 UTD - Trunk Tamper Switch Fault
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:

  • • 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.