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.
2000 Cadillac Seville SLSFACTORY OEM SERVICE PROCEDURE
Engine Control System - Self-Diagnostics - 4.6L
- Model Identification
- Introduction
- Self-Diagnostic System
- Description
- Scan Tool Display
- Diagnostic Procedure
- Retrieving DTCS
- On-Board Diagnostic (OBD) System Check
- DLC Diagnosis Or No Scan Tool Data
- Diagnostic Trouble Code Definition
- Hard Or Intermittent Trouble Code Determination
- Clearing Diagnostic Trouble Codes (DTCS)
- Pcm Location
- Diagnostic Materials
- Special Tools (Diagnostic)
- Scan Tool Usage
- Summary
- Diagnostic Tests
- Notes
- DTC P0101: MAF System Performance
- DTC P0102: MAF Sensor Circuit Low Frequency
- DTC P0103: MAF Sensor Circuit High Frequency
- DTC P0106: Map System Performance
- DTC P0107: Map Sensor Circuit - Low Voltage
- DTC P0108: Map Sensor Circuit - High Voltage
- DTC P0112: IAT Sensor Circuit - Low Voltage
- DTC P0113: IAT Sensor Circuit - High Voltage
- DTC P0117: ECT Sensor Circuit - Low Voltage
- DTC P0118: ECT Sensor Circuit - High Voltage
- DTC P0121: TP Sensor Circuit Insufficient Activity
- DTC P0122: TP Sensor Circuit - Low Voltage
- DTC P0123: TP SENSOR CIRCUIT - HIGH VOLTAGE (DeVILLE)
- DTC P0123: TP Sensor Circuit - High Voltage (ELDORADO & SEVILLE)
- DTC P0125: ECT Excessive Time To Enter Closed Loop Fuel Control
- DTC P0130: HO2S CIRCUIT CLOSED LOOP PERFORMANCE - BANK 1, SENSOR 1 (DeVILLE)
- DTC P0130: Ho2S Circuit Closed Loop Performance - Bank 1, Sensor 1 (ELDORADO & SEVILLE)
- DTC P0131: Ho2S Circuit Low Voltage - Bank 1, Sensor 1
- DTC P0132: Ho2S Circuit High Voltage - Bank 1, Sensor 1
- DTC P0133: HO2S SLOW RESPONSE - BANK 1, SENSOR 1 (DeVILLE)
- DTC P0133: Ho2S Slow Response - Bank 1, Sensor 1 (ELDORADO & SEVILLE)
- DTC P0134: HO2S CIRCUIT INSUFFICIENT ACTIVITY - BANK 1, SENSOR 1 (DeVILLE)
- DTC P0134: Ho2S Circuit Insufficient Activity - Bank 1, Sensor 1 (ELDORADO & SEVILLE)
- DTC P0135: HO2S HEATER PERFORMANCE - BANK 1, SENSOR 1 (DeVILLE)
- DTC P0137: Ho2S Circuit Low Voltage - Bank 1, Sensor 2
- DTC P0138: Ho2S Circuit High Voltage - Bank 1, Sensor 2
- DTC P0140: Ho2S Circuit Insufficient Activity - Bank 1, Sensor 2
- DTC P0141: HO2S HEATER PERFORMANCE - BANK 1, SENSOR 2 (DeVILLE)
- DTC P0150: HO2S CIRCUIT CLOSED LOOP PERFORMANCE - BANK 2, SENSOR 1 (DeVILLE)
- DTC P0150: Ho2S Circuit Closed Loop Performance - Bank 2, Sensor 1 (ELDORADO & SEVILLE)
- DTC P0151: Ho2S Circuit Low Voltage - Bank 2, Sensor 1
- DTC P0152: Ho2S Circuit High Voltage - Bank 2, Sensor 1
- DTC P0153: HO2S SLOW RESPONSE - BANK 2, SENSOR 1 (DeVILLE)
- DTC P0153: Ho2S Slow Response - Bank 2, Sensor 1 (ELDORADO & SEVILLE)
- DTC P0154: HO2S CIRCUIT INSUFFICIENT ACTIVITY - BANK 2, SENSOR 1 (DeVILLE)
- DTC P0154: Ho2S Circuit Insufficient Activity - Bank 2, Sensor 1 (ELDORADO & SEVILLE)
- DTC P0155: HO2S HEATER PERFORMANCE - BANK 2, SENSOR 1 (DeVILLE)
- DTC P0171: FUEL TRIM SYSTEM LEAN - BANK 1 (DeVILLE)
- DTC P0172: FUEL TRIM SYSTEM RICH - BANK 1 (DeVILLE)
- DTC P0174: FUEL TRIM SYSTEM LEAN - BANK 2 (DeVILLE)
- DTC P0175: FUEL TRIM SYSTEM RICH - BANK 2 (DeVILLE)
- DTC P0201: Injector No. 1 Control Circuit
- DTC P0202: Injector No. 2 Control Circuit
- DTC P0203: Injector No. 3 Control Circuit
- DTC P0204: Injector No. 4 Control Circuit
- DTC P0205: Injector No. 5 Control Circuit
- DTC P0206: Injector No. 6 Control Circuit
- DTC P0207: Injector No. 7 Control Circuit
- DTC P0208: Injector No. 8 Control Circuit
- DTC P0230: Fuel Pump Relay Control Circuit
- DTC P0300: Engine Misfire Detected
- DTC P0301: Cylinder No. 1 Misfire Detected
- DTC P0302: Cylinder No. 2 Misfire Detected
- DTC P0303: Cylinder No. 3 Misfire Detected
- DTC P0304: Cylinder No. 4 Misfire Detected
- DTC P0305: Cylinder No. 5 Misfire Detected
- DTC P0306: Cylinder No. 6 Misfire Detected
- DTC P0307: Cylinder No. 7 Misfire Detected
- DTC P0308: Cylinder No. 8 Misfire Detected
- DTC P0325: Knock Sensor Circuit
- DTC P0326: Knock Sensor Circuit Excessive Spark Retard
- DTC P0327: Knock Sensor Circuit - Low Voltage
- DTC P0335: CKP Sensor "A" Circuit Performance
- DTC P0336: CKP Sensor "B" Circuit Performance
- DTC P0340: Camshaft Position (CMP) Sensor Circuit
- DTC P0341: Camshaft Position (CMP) Sensor Performance
- DTC P0351: Ignition Coil No. 1 Control Circuit
- DTC P0352: Ignition Coil No. 2 Control Circuit
- DTC P0353: Ignition Coil No. 3 Control Circuit
- DTC P0354: Ignition Coil No. 4 Control Circuit
- DTC P0355: Ignition Coil No. 5 Control Circuit
- DTC P0356: Ignition Coil No. 6 Control Circuit
- DTC P0357: Ignition Coil No. 7 Control Circuit
- DTC P0358: Ignition Coil No. 8 Control Circuit
- DTC P0385: Crankshaft Position (CKP) Sensor "B" Circuit
- DTC P0386: Crankshaft Position (CKP) Sensor "B" Performance
- DTC P0401: EGR Flow Insufficient
- DTC P0403: EGR Solenoid Control Circuit
- DTC P0404: EGR Open Position Performance
- DTC P0405: EGR Position Sensor Circuit Low Voltage
- DTC P0410: SECONDARY AIR INJECTION (AIR) SYSTEM (DeVILLE & SEVILLE)
- DTC P0412: SECONDARY AIR INJECTION (AIR) SOLENOID RELAY CONTROL CIRCUIT - BANK 1 (DeVILLE & SEVILLE)
- DTC P0418: SECONDARY AIR INJECTION (AIR) PUMP RELAY CONTROL CIRCUIT - BANK 1 (DeVILLE & SEVILLE)
- DTC P0419: SECONDARY AIR INJECTION (AIR) PUMP RELAY CONTROL CIRCUIT - BANK 2 (DeVILLE & SEVILLE)
- DTC P0420: CATALYST SYSTEM LOW EFFICIENCY (DeVILLE)
- DTC P0440: EVAP System
- DTC P0442: EVAP System Small Leak Detected
- DTC P0443: EVAP Purge Solenoid Valve No. 1 Control Circuit
- DTC P0446: EVAP Vent System Performance
- DTC P0449: EVAP Vent Solenoid Control Circuit
- DTC P0452: Fuel Tank Pressure Sensor Circuit - Low Voltage
- DTC P0453: Fuel Tank Pressure Sensor Circuit - High Voltage
- DTC P0461: FUEL LEVEL SENSOR CIRCUIT PERFORMANCE (DeVILLE & SEVILLE)
- DTC P0461: Fuel Level Sensor Circuit Performance (ELDORADO)
- DTC P0462: FUEL LEVEL SENSOR CIRCUIT - LOW VOLTAGE (DeVILLE & SEVILLE)
- DTC P0463: FUEL LEVEL SENSOR CIRCUIT - HIGH VOLTAGE (DeVILLE & SEVILLE)
- DTC P0480: Cooling Fan Relay No. 1 Control Circuit
- DTC P0481: Cooling Fan Relay No. 2 Control Circuit
- DTC P0506: Idle Speed Low
- DTC P0507: Idle Speed High
- DTC P0532: A/C REFRIGERANT PRESSURE SENSOR CIRCUIT - LOW VOLTAGE (DeVILLE & SEVILLE)
- DTC P0533: A/C REFRIGERANT PRESSURE SENSOR CIRCUIT - HIGH VOLTAGE (DeVILLE & SEVILLE)
- DTC P0560: SYSTEM VOLTAGE (DeVILLE)
- DTC P0562: SYSTEM VOLTAGE LOW (DeVILLE)
- DTC P0563: SYSTEM VOLTAGE HIGH (DeVILLE)
- DTC P0601: Pcm Read Only Memory (ROM)
- DTC P0602: Pcm Not Programmed
- DTC P0603: Pcm Long Term Memory Reset
- DTC P0604: Malfunction In Ram Area
- DTC P0606: Pcm Internal Performance
- DTC P0615: Starter Relay Control Circuit
- DTC P0621: Generator "L" Terminal Circuit
- DTC P0622: Generator "F" Terminal Circuit
- DTC P0650: Malfunction Indicator Light (Mil) Control Circuit
- DTC P1106: Map Sensor Circuit Intermittent High Voltage
- DTC P1107: Map Sensor Circuit Intermittent Low Voltage
- DTC P1111: IAT Sensor Circuit Intermittent High Voltage
- DTC P1112: IAT Sensor Circuit Intermittent Low Voltage
- DTC P1114: ECT Sensor Circuit Intermittent Low Voltage
- DTC P1115: ECT Sensor Circuit Intermittent High Voltage
- DTC P1121: TP Sensor Circuit Intermittent High Voltage
- DTC P1122: TP Sensor Circuit Intermittent Low Voltage
- DTC P1133: Ho2S Insufficient Switching - Bank 1, Sensor 1
- DTC P1134: Ho2S Transition Time Ratio - Bank 1, Sensor 1
- DTC P1153: Ho2S Insufficient Switching - Bank 2, Sensor 1
- DTC P1154: Ho2S Transition Time Ratio - Bank 2, Sensor 1
- DTC P1189: Engine Oil Pressure (EOP) Switch Circuit
- DTC P1258: Engine Coolant OVERTEMPERATURE Protection Mode Active
- DTC P1336: Crankshaft Position (CKP) System Variation Not Learned
- DTC P1359: Ignition Control Group 1 Control Circuit
- DTC P1360: Ignition Control Group 2 Control Circuit
- DTC P1372: Crankshaft Position (CKP) Sensor "A" & "B" Correlation
- DTC P1380: Misfire Detected - Rough Road Data Not Available
- DTC P1381: Misfire Detected - No Communication With Brake Control Module
- DTC P1404: EGR Valve Closed Position Performance
- DTC P1415: SECONDARY AIR INJECTION (AIR) SYSTEM - BANK 1 (DeVILLE & SEVILLE)
- DTC P1416: SECONDARY AIR INJECTION (AIR) SYSTEM - BANK 2 (DeVILLE & SEVILLE)
- DTC P1441: EVAP System Flow During Non-Purge
- DTC P1545: A/C CLUTCH RELAY CONTROL CIRCUIT (DeVILLE & SEVILLE)
- DTC P1545: A/C Clutch Relay Control Circuit (ELDORADO)
- DTC P1554: Cruise Feedback Circuit
- DTC P1560: Transaxle Not In Drive - Cruise Control Disabled
- DTC P1564: Vehicle Acceleration Too High - Cruise Control Disabled
- DTC P1566: Engine Rpm Too High - Cruise Control Disabled
- DTC P1567: Active Braking Control Active - Cruise Control Disabled
- DTC P1570: Traction Control Active - Cruise Control Disabled
- DTC P1571: TCS TORQUE REQUEST CIRCUIT (DeVILLE)
- DTC P1571: TCS Torque Request Circuit (ELDORADO & SEVILLE)
- DTC P1574: Stoplight Switch Circuit
- DTC P1575: Extended Travel Brake Switch Circuit
- DTC P1579: P/N To D/R At High Throttle Angle - Power Reduction Mode
- DTC P1585: CRUISE CONTROL INHIBIT OUTPUT CIRCUIT (DeVILLE & ELDORADO)
- DTC P1585: Cruise Control Inhibit Output Circuit (SEVILLE)
- DTC P1599: Engine Stall Or Near Stall Detected
- DTC P1617: Engine Oil Level Switch Circuit
- DTC P1621: Pcm Long Term Memory Performance
- DTC P1624: Customer Snapshot Requested - Data Available
- DTC P1630: Theft Deterrent Learn Mode Active
- DTC P1631: Theft Deterrent Start Enable Signal Not Correct
- DTC P1633: Ignition 0 Switch Circuit
- DTC P1634: Ignition 1 Switch Circuit
- DTC P1635: 5-Volt Reference "A" Circuit
- DTC P1639: 5-VOLT REFERENCE "B" CIRCUIT (DeVILLE & SEVILLE)
- DTC P1639: 5-Volt Reference "B" Circuit (ELDORADO)
- DTC P1644: Traction Control Delivered Torque Output Circuit
- DTC P1652: Powertrain Induced Chassis Pitch Output Circuit
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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