Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1998 Cadillac Eldorado BaseFACTORY OEM SERVICE PROCEDURE
PZM DTC Definitions
PZM COMMUNICATION PROBLEMS
| Affected System | Perform Test |
|---|---|
| Class 2 Serial Data Line | Class 2 Serial Data Line System Check |
| Scan Tool Communications | Chart A: Scan Tool Will Not Communicate |
PZM DTC DEFINITIONS
| DTC No. (1) | Circuit Affected | ||
|---|---|---|---|
| U1016 | Loss Of Serial Communications - PCM | ||
| U1088 | Loss Of Serial Communications - SDM | ||
| U1096 | Loss Of Serial Communications - IPC | ||
| U1128 | Loss Of Serial Communications - IRC | ||
| U1153 | Loss Of Serial Communications - CCP | ||
| U1169 | Loss Of Serial Communications - MMM | ||
| U1255 | Class 2 Initialization Error | ||
| U1300 | Class 2 Short To Ground | ||
| U1301 | Class 2 Short To Battery | ||
| B0532 | Fuel Level Sensor Short To Ground | ||
| B0533 | Fuel Level Sensor Short To Battery | ||
| B1552 | Loss Of PZM Keep Alive Memory (KAM) | ||
| B1556 | PZM EEPROM Write Error | ||
| B1558 | PZM EEPROM Checksum Error | ||
| B1970 | Exterior Light Power Fault | ||
| B1971 | Inadvertent Power Fault | ||
| B1972 | Low Power Control Fault | ||
| B1973 | High Power Control Fault | ||
| B1981 | Battery Voltage Too Low | ||
| B1982 | Battery Voltage Too High | ||
| B1983 | Source Voltage Too Low | ||
| B2470 | Daytime Running Lights Fault | ||
| B2471 | Interior Lights Fault | ||
| B2472 | Low Beam Output Fault | ||
| B2473 | High Beam Output Fault | ||
| B2476 | Parking Lights Output Fault | ||
| B2477 | Reverse Light Relay Shorted To Ground | ||
| B2478 | Reverse Light Relay Shorted To Battery | ||
| B2502 | Park Gear Relay (BTSI) Shorted To Ground | ||
| B2503 | Park Gear Relay (BTSI) Shorted To Battery | ||
| B2550 | Storage Mode Entered | ||
| B2719 | UTD - Trunk Tamper Switch Fault | ||
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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.
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