---
title: General Motors Truck Factory DTC Code Definitions
description: P1020 CNG Fuel Injector Control Circuit P1031 PCM Circuit Faulting In RAM P1032 PCM Circuit Fault Low Side Driver P1093 Fuel Pressure Too High P1094 Fuel F
---

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# General Motors Truck Factory DTC Code Definitions

[![John Wells](https://blog.upfix.com/hs-fs/hubfs/JohnWells.png?width=50&height=50&name=JohnWells.png)](https://blog.upfix.com/author/johnwells)

[John Wells](https://blog.upfix.com/author/johnwells)  March 1 2016

 Last updated:  November 24 2023

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| P1020 |
| --- |
| CNG Fuel Injector Control Circuit |
| P1031 |
| PCM Circuit Faulting In RAM |
| P1032 |
| PCM Circuit Fault Low Side Driver |
| P1093 |
| Fuel Pressure Too High |
| P1094 |
| Fuel Flow Excessive |
| P1106 |
| BARO-MAP Sensor Comparison Too High |
| P1107 |
| MAP Sensor Circuit Intermittent High Or Low Voltage |
| P1111 |
| IAT Sensor Circuit Intermittent High Voltage |
| P1112 |
| IAT Sensor Circuit Intermittent High Voltage |
| P1113 |
| Intake Resonance Switchover Solenoid Control Circuit |
| P1114 |
| ECT Sensor Circuit Intermittent Low Or High Voltage |
| P1115 |
| ECT Sensor Circuit Intermittent Low Or High Voltage |
| P1120 |
| TPS 1 Circuit |
| P1121 |
| TP Sensor Circuit Intermittent High Or Low Voltage |
| P1122 |
| TP Sensor Circuit Intermittent High Or Low Voltage |
| P1125 |
| APP System Sensors |
| P1133 |
| HO2S 1 Insufficient Switching Bank I Sensor 1 |
| P1134 |
| HO2S 1 Transition Time Ratio Bank 1 Sensor 1 |
| P1137 |
| HO2S Circuit Low Voltage During Power Enrichment Sensor 2 |
| P1138 |
| HO2S Circuit High Voltage During Decal Fuel Cutoff Sensor 2 |
| P1141 |
| Heater Control Circuit Bank 1 Sensor 2 |
| P1153 |
| Insufficient Switching Bank 2 Sensor 1 |
| P1154 |
| HO2S Transition Time Ratio Bank 2 Sensor I |
| P1161 |
| Heater Control Circuit Bank 2 Sensor 2 |
| P1171 |
| Fuel System Lean During Acceleration |
| P1172 |
| Secondary Fuel Pump Insufficient Or No Flow/Level Sensor |
| P1189 |
| Engine Oil Pressure Switch Circuit |
| P1191 |
| Intake Air Duct Leak |
| P1204 |
| CNG Mode Fault |
| P1207 |
| Rail Pressure Output Signal |
| P1208 |
| Fuel Rail Temperature Output Signal |
| P1209 |
| Fuel Injector Control Module Communication |
| P1214 |
| Injection Pump Timing Offset |
| P1216 |
| Fuel Solenoid Response Time Too Short Or Long |
| P1217 |
| Fuel Solenoid Response Time Too Short Or Long |
| P1218 |
| Injection Pump Calibration Circuit |
| P1220 |
| TPS 2 Circuit |
| P1221 |
| TPS 1-2 Correlation |
| P1223 |
| Injector Driver Voltage Improper |
| P1226 |
| Injector Driver Voltage Improper |
| P1229 |
| Injector Driver Voltage Improper |
| P1232 |
| Injector Driver Voltage Improper |
| P1235 |
| Injector Driver Voltage Improper |
| P1238 |
| Injector Driver Voltage Improper |
| P1241 |
| Injector Driver Voltage Improper |
| P1244 |
| Injector Driver Voltage Improper |
| P1258 |
| Engine Metal Overtemperature Protection |
| P1261 |
| High Voltage Circuit Failure Cylinders 1, 4, 6 and 7 |
| P1262 |
| High Voltage Circuit Failure Cylinders 2, 3, 5 and 8 |
| P1270 |
| APP Sensor Analog-Digital Performance |
| P1271 |
| APP Sensor 1-2 Correlation |
| P1272 |
| APP Sensor 2-3 Correlation |
| P1273 |
| APP Sensor 1-3 Correlation |
| P1275 |
| APP Sensor 1 Circuit |
| P1276 |
| APP Sensor 1 Performance |
| P1277 |
| APP Sensor 1 Low Or High Voltage |
| P1278 |
| APP Sensor 1 Low Or High Voltage |
| P1280 |
| APP Sensor 2 Circuit |
| P1281 |
| APP Sensor 2 Performance |
| P1282 |
| APP Sensor 2 Low Or High Voltage |
| P1283 |
| APP Sensor 2 Low Or High Voltage |
| P1285 |
| APP Sensor 3 Circuit |
| P1286 |
| APP Sensor 3 Performance |
| P1287 |
| APP Sensor 3 Low Or High Voltage |
| P1288 |
| APP Sensor 3 Low Or High Voltage |
| P1320 |
| IC 4X Reference Circuit Intermittent |
| P1323 |
| IC 24X Reference Circuit Low Frequency |
| P1336 |
| CKP System Variation Not Learned |
| P1345 |
| CKP-CMP Correlation |
| P1350 |
| Ignition Control System |
| P1351 |
| Ignition Coil Circuits Open Or High Voltage |
| P1356 |
| Ignition Coil Circuits Open Or High Voltage |
| P1359 |
| Ignition Coil Control Circuit Group 1 Or 2 |
| P1360 |
| Ignition Coil Control Circuit Group 1 Or 2 |
| P1361 |
| Ignition Coil Circuits Not Toggling Or Low Voltage |
| P1366 |
| Ignition Coil Circuits Not Toggling Or Low Voltage |
| P1370 |
| IC 4X Reference Circuit Too Many Or Too Few Pulses |
| P1371 |
| IC 4X Reference Circuit Too Many Or Too Few Pulses |
| P1372 |
| CKP Sensor A-B Correlation |
| P1374 |
| CKP 3X Reference Circuit |
| P1375 |
| IC 4X Reference Circuit High Voltage |
| P1376 |
| Ignition Ground Circuit |
| P1377 |
| IC Cam Pulse To 4X Reference Pulse |
| P1380 |
| ECBM Rough Road Data Unusable |
| P1381 |
| Misfire Detected No ECBM/PCM Serial Data |
| P1404 |
| EGR Valve Pintle Seized |
| P1408 |
| MAP Sensor Circuit |
| P1410 |
| Fuel Tank Pressure Control Solenoid Control Circuit |
| P1415 |
| AIR System Bank 1 |
| P1416 |
| AIR System Bank 2 |
| P1431 |
| Fuel Level Sensor 2 Performance |
|  |
| P1432 |
| Fuel Tank Temperature/level Sensor Low Voltage |
| P1433 |
| Fuel Tank Temperature/level Sensor High Voltage |
| P1441 |
| EVAP System Flow During Non-Purge |
| P1450 |
| BARO Pressure Sensor Circuit |
| P1451 |
| BARD Pressure Sensor Performance |
| P1460 |
| Misfire Detected, Low Fuel |
| P1483 |
| ECT Cooling System Performance |
| P1500 |
| Starter Switch Signal Circuit |
| P1501 |
| Anti-Theft System |
| P1502 |
| Anti-Theft Fuel Enable Signal Not Received |
| P1503 |
| Anti-Theft Fuel Enable Signal Improper |
| P1509 |
| IAC System RPM Out Of Range |
| P1510 |
| IAC System RPM Out Of Range |
| P1511 |
| Throttle Control System Back-Up Performance |
| P1512 |
| TP Commanded vs Actual Error |
| P1514 |
| Throttle Body Performance |
| P1515 |
| Control Module Throttle Actuator Position Performance |
| P1516 |
| Throttle Actuator Control Module Position Performance |
| P1517 |
| TAC Module Performance |
| P1518 |
| TAC Module Serial Data Circuit |
| P1519 |
| Throttle Actuator Control Module Internal Circuit |
| P1520 |
| PNP Switch Circuit |
| P1523 |
| Throttle Closed Position Performance |
| P1524 |
| TP Sensor Learned Closed Throttle Angle |
| P1526 |
| Throttle Minimum Position Not Learned |
| P1527 |
| Transmission Range-Pressure Switch Comparison |
| P1530 |
| Throttle Actuator Control Module Internal Circuit |
| P1533 |
| A/C Low Or High Side Temperature Sensor Circuit |
| P1535 |
| A/C Low Or High Side Temperature Sensor Circuit |
| P1536 |
| A/C System ECT Overtemperature |
| P1537 |
| A/C Request Circuit Voltage Low Or High |
| P1538 |
| A/C Request Circuit Voltage Low Or High |
| P1540 |
| A/C System High Pressure |
| P1542 |
| A/C System High Pressure/High Temperature |
| P1545 |
| A/C Clutch Relay. Control Circuit |
| P1546 |
| A/C Clutch Relay. Control Circuit |
| P1554 |
| Speed Control Status Circuit |
| P1560 |
| Speed Control, Transmission Not In Drive |
| P1564 |
| Speed Control, Acceleration Too High |
| P1566 |
| Speed Control, Engine RPM Too High |
| P1567 |
| Speed Control, ABCS Active |
| P1570 |
| Speed Control, Traction Control Active |
| P1571 |
| Traction Control Torque Request Circuit |
| P1573 |
| PCM/EBTCM Serial Data Circuit |
| P1574 |
| EBTCM Stop Lamp Switch Circuit High Voltage |
| P1575 |
| Extended Travel Brake Switch Circuit |
| P1579 |
| P/N To D/R At High Throttle Angle |
| P1585 |
| Cruise Inhibit Control Circuit |
| P1599 |
| Engine Stall Or Near Stall Detected |
| P1600 |
| PCM Memory Not Programmed |
| P1602 |
| Knock Sensor Module Performance |
| P1603 |
| SDM Serial Data Loss |
| P1604 |
| IPC Serial Data Circuit Loss |
| P1605 |
| HVAC Serial Data Circuit Loss |
| P1610 |
| Standard Body Module (PCM) Serial Data Circuit Loss |
| P1611 |
| CVRTD Serial Data Loss |
| P1612 |
| IPM Serial Data Loss |
| P1613 |
| DIM Serial Data Loss |
| P1614 |
| RIM Serial Data Loss |
| P1615 |
| VTD Serial Data Loss |
| P1617 |
| Engine Oil Level Switch Circuit |
| P1621 |
| PCM Memory Not Programmed |
| P1624 |
| Customer Snapshot Requested Data Available |
| P1626 |
| Anti-Theft Fuel Enable Signal Not Received |
| P1627 |
| PCM Memory Not Programmed |
| P1629 |
| Anti-Theft Crank Signal Fault |
| P1630 |
| Anti-Theft Learn Mode Active |
| P1631 |
| Anti-Theft Fuel Enable Signal Improper |
| P1632 |
| Anti-Theft Fuel Disable Signal Received |
| P1633 |
| Ignition Supplement Power Circuit Low Voltage |
| P1634 |
| Ignition 1 Power Circuit Low Voltage |
| P1635 |
| 5 Volt Reference (A) Circuit |
| P1637 |
| Alternator L-Terminal Circuit |
| P1638 |
| Alternator F-Terminal Circuit |
| P1639 |
| 5 Volt Reference (B) Circuit |
| P1640 |
| Control Module Output (A) Or Driver-1 Input Circuit |
| P1641 |
| A/C Relay Control Circuit |
| P1642 |
| Change Oil Lamp Control Circuit |
| P1643 |
| Wait To Start Lamp Control Circuit |
| P1644 |
| Delivered Torque Output Circuit |
| P1645 |
| EVAP Solenoid Output Circuit |
| P1646 |
| EVAP Vent Valve Output Circuit |
| P1650 |
| Control Module Output (B) Circuit |
| P1651 |
| Fan No. 1 Relay Control Circuit |
| P1652 |
| Fan No. 2 Relay Control Circuit |
| P1653 |
| Fuel Level/EGR Output Control Circuit |
| P1654 |
| Speed Control Disable Output Circuit |
| P1655 |
| EVAP Purge Solenoid Control Circuit |
| P1660 |
| Control Module Output (C) Or Cooling Fan Control Circuits |
| P1662 |
| Cruise Lamp Control Circuit |
| P1663 |
| Alternator Lamp Control Circuit |
| P1665 |
| EVAP Vent Valve Solenoid Control Circuit |
| P1670 |
| Control Module Output (D) Circuit |
| P1671 |
| MIL Control Circuit |
| P1672 |
| Low Engine Oil Lamp Control Circuit |
| P1673 |
| Engine Hot Lamp Control Circuit |
| P1675 |
| EVAP Vent Solenoid Control Circuit |
| P1676 |
| EVAP Canister Purge Solenoid Control Circuit |
| P1680 |
| PCM Memory Not Programmed |
| P1681 |
| PCM Memory Not Programmed |
| P1682 |
| ETC System Voltage Imbalance |
| P1683 |
| PCM Memory Not Programmed |
| P1689 |
| Traction Control Delivered Torque Output Circuit |
| P1700 |
| TCM Requested MIL Lighting |
| P1715 |
| PNP Circuit |
| P1781 |
| MIL Request Circuit Improper Voltage |
| P1810 |
| 2-3 Shift Solenoid Valve Electrical |
| P1811 |
| Maximum Adapt and Long Shift |
| P1812 |
| Transmission Fluid Overtemperature |
| P1814 |
| Torque Converter Overstress |
| P1819 |
| Transmission Internal Mode Switch Circuit |
| P1820 |
| Transmission Internal Mode Switch Circuit A Low |
| P1822 |
| Transmission Internal Mode Switch Circuit B High |
| P1823 |
| Transmission Internal Mode Switch Circuit P Low |
| P1825 |
| Transmission Internal Mode Switch Illegal Range |
| P1826 |
| Transmission Internal Mode Switch Circuit CB High |
| P1845 |
| Torque Limit Management |
| P1860 |
| TCC PWM Solenoid Valve |
| P1870 |
| Transmission Component Slipping |
| P1871 |
| Gear Ratio Undefined |
| P1875 |
| 4WD Low Switch Input |
| P1880 |
| TCC PWM Solenoid Circuit Electrical |
| P1887 |
| TCC Release Switch Circuit |
| P2122 |
| APP Sensor 1 Improper Voltage |
| P2123 |
| APP Sensor 1 Improper Voltage |
|  |
| P2127 |
| APP Sensor 2 Improper Voltage |
| P2128 |
| APP Sensor 2 Improper Voltage |
|  |
| P2132 |
| APP Sensor 2 Improper Voltage |
| P2133 |
| APP Sensor 2 Improper Voltage |
|  |
| P2138 |
| APP Sensors 1 and 2 Improper Voltage |
| P2139 |
| APP Sensors 2 and 3 Voltage Out Of Range |
| P2140 |
| APP Sensors 1 and 3 Voltage Out Of Range |
| P2141 |
| EGR |
| P2142 |
| Throttle Valve Solenoid Control Circuit Voltage Low Or High |
| P2144 |
| EGR Vent Solenoid Control Circuit Voltage Low Or High |
| P2145 |
| EGR Vent Solenoid Control Circuit Voltage Low Or High |
|  |
| P2146 |
| Cylinders 1, 4, 6 and 7 Injector High Voltage |
| P2149 |
| Cylinders 2, 3, 5 and 8 Injector High Voltage |
| P2108 |
| Throttle Actuator Control Internal Fault |
| P2120 |
| APP Sensor 1 Voltage Out Of Range |
| P2121 |
| APP Sensors 1 and 2 Signals Out Of Correlation |
| P2125 |
| APP Sensor 2 Voltage Out Of Range |
| P2135 |
| TP Sensors 1 and 2 Signals Out Of Correlation |
| P2227 |
| 5-volt Reference Circuit Voltage Out Of Tolerance |
| P2228 |
| 5-volt Reference Circuit Voltage Out Of Tolerance |
| P2229 |
| 5-volt Reference Circuit Voltage Out Of Tolerance |
| P2279 |
| Intake Leak Detected |
| P2665 |
| LPL Relay Control Circuit |
| P2668 |
| Fuel Indicator Lamp Circuit |
| U1000 |
| Lost Communication, Missing Parameter |
| U1001 |
| Lost Communication, Missing Parameter |
| U1016 |
| Class 2 Communication Fault |
| U1026 |
| ATC Class 2 Communication Loss |
| U1040 |
| EBCM/EBTCM Communication Loss |
| U1041 |
| EBCM Communication Loss |
| U1064 |
| BCM Communication Loss |
| U1192 |
| VTD Communication Loss |
| U1193 |
| VIM Class 2 Communication Loss |
| U1254 |
| Lost Communication, Missing Parameter |
| U1255 |
| Lost Communication, Missing Parameter |
| U1300 |
| Class 2 Serial Data Circuit Voltage Low Or High |
| U1301 |
| Class 2 Serial Data Circuit Voltage Low Or High |
| U1305 |
| Class 2 Serial Data Circuit Voltage Out Of Range |
| U1500 |
| HVAC and Auxiliary HVAC Module Signal Loss |
| U1800 |
| CAN Communication BUS Message Lost |

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