LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 2004 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 121 (Engine Controls - Self Diagnostics - 6.6L) >> Diagnostic Trouble Code Definitions
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Trouble Code Definitions

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC TROUBLE CODE INDEX

DTC (1) Description (2) Code Type
BXXXX (3) Body Control Systems Malfunction N/A
CXXXX (3) Chassis Control System Malfunction N/A
P0016  Camshaft Position Sensor/Crankshaft Position Sensor Correlation Error C
P0087  Fuel Rail Pressure Low A
P0088  Fuel Rail Pressure High A
P0089  Fuel Rail Pressure Sensor Indicating Fuel Pressure Higher Than Desired (4)
P0090  Fuel Rail Pressure Sensor Current Out Of Range A
P0101  Mass Air Flow Sensor Performance (5)
P0102  Mass Air Flow Sensor Circuit - Low Frequency B
P0103  Mass Air Flow Sensor Circuit - High Frequency B
P0112  Intake Air Temperature Sensor Circuit - Low Voltage B
P0113  Intake Air Temperature Sensor Circuit - High Voltage B
P0116  ECT Sensor Performance (6) B
P0117  ECT Sensor Circuit - Low Voltage B
P0118  ECT Sensor Circuit - High Voltage B
P0128  ECT Less Than Thermostat Regulating Temperature B
P0168  Fuel Temperature Sensor High C
P0181  Fuel Temperature Sensor & IAT Sensor Temperature Not Within Specification B
P0182  Fuel Temperature Sensor Circuit - Low Voltage A
P0183  Fuel Temperature Sensor Circuit - High Voltage A
P0192  Fuel Rail Pressure Sensor Circuit - Low Voltage A
P0193  Fuel Rail Pressure Sensor Circuit - High Voltage A
P0201-P0208  Fuel Injector Control Circuits A
P0234  Turbocharger Engine Overboost Condition - California RPO YF5, NE1 B
P0234  Turbocharger Engine Overboost Condition - Federal RPO FE9, NG1 B
P0236  Turbocharger Boost System - California RPO YF5, NE1 B
P0236  Turbocharger Boost System - Federal RPO FE9, NG1 C
P0237  Turbocharger Boost Sensor Circuit Low Voltage - California RPO YF5, NE1 B
P0237  Turbocharger Boost Sensor Circuit Low Voltage- Federal RPO FE9, NG1 B
P0238  Turbocharger Boost Sensor Circuit High Voltage - California RPO YF5, NE1 B
P0238  Turbocharger Boost Sensor Circuit High Voltage - Federal RPO FE9, NG1 B
P0300  Engine Misfire Detected - California RPO YF5, NE1 B
P0300  Engine Misfire Detected - Federal- Federal RPO FE9, NG1 C
P0301-P0308  Cylinders No. 1-8 Misfire Detected - California RPO YF5, NE1 B
P0301-P0308  Cylinders No. 1-8 Misfire Detected - Federal RPO FE9, NG1 C
P0335  Crankshaft Position Sensor Circuit A
P0336  Crankshaft Position Sensor Circuit Performance B
P0340  CMP Sensor Circuit Performance A
P0341  Camshaft Position Sensor Circuit Performance B
P0370  Timing Reference High Resolution A
P0374  Timing Reference High Resolution A
P0380  Glow Plug Circuit Performance - California RPO YF5, NE1 B
P0380  Glow Plug Circuit Performance - Federal RPO FE9, NG1 C
P0381 (3) Wait-To-Start Indicator Fault Detection Circuit Malfunction (5)
P0401  EGR System - Insufficient Flow (6) B
P0404  EGR Valve Open Pintle Position (6) B
P0405  EGR Pintle Position Circuit - Low Voltage (6) B
P0406  EGR Sensor Circuit High Voltage (6) B
P0461 Fuel Level Sensor Circuit Performance C
P0462 Fuel Level Sensor Circuit - Low Voltage C
P0463 Fuel Level Sensor Circuit - High Voltage C
P0489:  EGR Solenoid Circuit - Low Voltage (6) B
P0490  EGR Solenoid Circuit - High Voltage (6) B
P0500 Vehicle Speed Sensor (7) B
P0522 Engine Oil Pressure Sensor Circuit Low Voltage C
P0523 Engine Oil Pressure Sensor Circuit High Voltage C
P0530 A/C Refrigerant Pressure Sensor Circuit C
P0540  Intake Air Heater - Incorrect Voltage B
P0543  Intake Air Heater - Incorrect Voltage B
P0562 Low System Voltage C
P0563 High System Voltage C
P0567 (8) Cruise Control C
P0568 (8) Cruise Control Set/Coast Switch Circuit C
P0571 (8) Cruise Control Brake Switch Circuit C
P0601  ECM Memory A
P0602  ECM Not Programmed A
P0603  Control Module Long Term Memory Reset C
P0604  ECM Random Access Memory Performance A
P0605  ECM Memory A
P0606  ECM Memory A
P0607  ECM Memory A
P0608 (9) Vehicle Speed Circuit Fault C
P0609 (3) Vehicle Speed Signal Circuit - Low Voltage C
P0611  Fuel Injection Control Module Internal Fault B
P0612  Fuel Injection Control Module Internal Fault B
P0615 (3) Starter Relay Circuit C
P0621 (3) Generator Turn-On Signal Circuit Low/High C
P0622 (3) Generator PWM Signal Out Of Range C
P0641  5-Volt Reference Circuit Out Of Range A
P0650  MIL Control Circuit A
P0651  Sensor Reference Voltage "B" Circuit/Open B
P0654 (9) Engine Speed Circuit Fault C
P0700  TCM MIL Request A
P0704 (10) Clutch Pedal Switch Input Circuit B
P0706 (11) Transmission Range Switch C
P0802  Transmission Control System MIL Request Circuit Open B
P0833 (10) Vehicle Speed Transitions Detected Without Clutch Switch Transitions C
P1093  Fuel Rail Pressure Out Of Range (4)
P1094  Excessive Fuel Injection Pump Flow C
P1125  Accelerator Pedal Position Sensors Out Of Range Or Disagree C
P1172  Fuel Transfer Malfunction C
P1223  Incorrect Voltage For Commanded State Of Injector Driver No. 1 (5)
P1226  Incorrect Voltage For Commanded State Of Injector Driver No. 2 (5)
P1229  Incorrect Voltage For Commanded State Of Injector Driver No. 3 (5)
P1232  Incorrect Voltage For Commanded State Of Injector Driver No. 4 (5)
P1235  Incorrect Voltage For Commanded State Of Injector Driver No. 5 (5)
P1238  Commanded State Of Injector Driver No. 6 (5)
P1241  Incorrect Voltage For Commanded State Of Injector Driver No. 7 (5)
P1244  Incorrect Voltage For Commanded State Of Injector Driver No. 8 (5)
P1258  Engine Over-Temperature Condition A
P1270  Accelerator Pedal Position Sensor A/D Converter Error C
P1404 (6) EGR Valve Closed Pintle Position B
P1550  Fuel Injector Control Module - Low Voltage C
P1600  ECM Memory A
P1621  ECM Memory Performance C
P1626 (3) Passlock® System Malfunction C
P1627  ECM Memory A
P1631 (3) Passlock® System Malfunction C
P1637 (3) Generator "L" Terminal Circuit - Improper Voltage Level C
P1638 (3) Generator Field Duty Cycle Signal Circuit Out Of Range C
P1658  Fuel Injector Control Module Driver Circuits A
P1680  ECM Memory A
P1681  ECM Memory A
P1683  ECM Memory A
P2066 (9) Secondary Fuel Level Sensor Signal Lack Of Variation C
P2067 (9) Secondary Fuel Level Sensor Signal Lower Than Normal C
P2068 (9) Secondary Fuel Level Sensor Signal Higher Than Normal C
P2122  Accelerator Pedal Position Sensor No. 1 Low Voltage C
P2123  Accelerator Pedal Position Sensor No. 1 High Voltage C
P2127  Accelerator Pedal Position Sensor No. 2 Low Voltage C
P2128  Accelerator Pedal Position Sensor No. 2 High Voltage C
P2132  Accelerator Pedal Position Sensor No. 3 Low Voltage C
P2133  Accelerator Pedal Position Sensor No. 3 High Voltage C
P2138  Accelerator Pedal Position Sensors No. 1 & 2 Correlation Error C
P2139  Accelerator Pedal Position Sensors No. 2 & 3 Correlation Error C
P2140  Accelerator Pedal Position Sensors No. 1 & 3 Correlation Error C
P2141  EGR Throttle Valve Vacuum Control Solenoid Circuit - Low Voltage (6) B
P2142  EGR Throttle Valve Vacuum Control Solenoid Circuit - High Voltage (6) B
P2144  EGR Throttle Valve Vacuum Control Solenoid Circuit - High Voltage (6) B
P2145  EGR Vacuum Vent Solenoid Control Circuit - High Voltage (6) B
P2146  Fuel Injector Circuit Condition - Cylinder No. 1, 4, 6, Or 7 A
P2149  Fuel Injector Circuit Condition - Cylinder No. 2, 3, 5, Or 8 A
P2227  Barometric Pressure Sensor/EGR Vacuum Sensor Correlation Error - California RPO YF5, NE1 B
P2227  Barometric Pressure Sensor/Boost Sensor Correlation Error - Federal RPO FE9, NG1 C
P2228  Barometric Pressure Sensor Signal Low - California RPO YF5, NE1 B
P2228  Barometric Pressure Sensor Signal Low - Federal RPO FE9, NG1 B
P2229  Barometric Pressure Sensor Signal High - California RPO YF5, NE1 B
P2229  Barometric Pressure Sensor Signal High - Federal RPO FE9, NG1 B
P2279 (6) Air Intake Leak Detected B
P2610  ECM Memory B
UXXXX (3) Network Communication System Malfunction N/A
(1) DTC definitions may vary depending on vehicle and/or engine configuration.
(2) See CODE TYPES  under ON-BOARD DIAGNOSTICS.
(3) See appropriate BODY CONTROL SYSTEM article in ACCESSORIES & EQUIPMENT.
(4) On California emissions equipped vehicles (RPO codes YF5, NE1), this DTC is a type "A" code. On Federal emissions equipped vehicles (RPO codes FE9, NG1), this DTC is a type "C" code.
(5) On California emissions equipped vehicles (RPO codes YF5, NE1), this DTC is a type "B" code. On Federal emissions equipped vehicles (RPO codes FE9, NG1), this DTC is a type "C" code.
(6) Code does not apply to Federal vehicles
(7) On vehicles equipped with A/T, see appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS. On vehicles equipped with M/T, see appropriate DIAGNOSIS article in MANUAL TRANSMISSIONS.
(8) See appropriate CRUISE CONTROL SYSTEMS article in ACCESSORIES & EQUIPMENT.
(9) See appropriate ANALOG INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT.
(10) See appropriate DIAGNOSIS article in MANUAL TRANSMISSIONS.
(11) See appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS.
scientia non olet · About LEMON Manuals