DSM.0055 Ver. 1.0   May 31, 2022


This manual is designed as a support document for trained technicians in the maintenance and diagnostic procedures of the 488LPI™ propane autogas engine and fuel system provided by Hexagon Agility®.

No attempt shall be made to install, maintain, or repair this product until this manual and all referenced supporting documentation have been read and fully understood.

Please click on the PDF link to open the manual.


Diagnostic Trouble Codes (DTCs) by Suspect Parameter Number (SPN) and Failure Mode Indicator (FMI)

SPNFMIDocument Title / CircuitDescription
293SPN 29 or 91 Accelerator Pedal Position APP2 Sensor Signal Voltage High
294SPN 29 or 91 Accelerator Pedal Position APP2 Sensor Signal Voltage Low
512SPN 51 PerformanceThrottle Position Sensor Conflict
513SPN 51 or 3673Throttle Position Sensor TPS1 Sensor Signal Voltage High
514SPN 51 or 3673Throttle Position Sensor TPS1 Sensor Signal Voltage Low
517SPN 51 PerformanceThrottle Position Sensor TPS1 ECM–TSM Rationality Conflict
5111SPN 51 PerformanceThrottle Position Sensor (TPS) Throttle Learn Error
5119SPN 51 PerformanceThrottle Position Sensor (TPS) Invalid
912SPN 91 PerformanceAccelerator Pedal Position (APP) Sensor Conflict
913SPN 29 or 91 Accelerator Pedal Position APP1 Sensor Signal Voltage High
914SPN 29 or 91 Accelerator Pedal Position APP1 Sensor Signal Voltage Low
917SPN 91 PerformanceAccelerator Pedal Position APP1 ECM–TSM Rationality Conflict
9119SPN 91 PerformanceThrottle Position Sensor (TPS) Invalid
947SPN 94Fuel System Fault / Low Fuel Rail Pressure
963SPN 96Fuel Level Sensor Voltage High
964SPN 96Fuel Level Sensor Voltage Low
1001SPN 100 Oil Pressure Low
1003SPN 100 Oil Pressure Sensor Signal Voltage High
1004SPN 100 Oil Pressure Sensor Signal Voltage Low
1063SPN 106Manifold Absolute Pressure (MAP) Sensor Signal Voltage High
1064SPN 106Manifold Absolute Pressure (MAP) Sensor Signal Voltage Low
1100SPN 110 PerformanceEngine Coolant Temperature Overheating
1103SPN 110Engine Coolant Temperature (ECT) Sensor Circuit Voltage High
1104SPN 110Engine Coolant Temperature (ECT) Sensor Circuit Voltage Low
1107SPN 110 PerformanceEngine Coolant Temperature Not Warm
11016SPN 110 PerformanceEngine Coolant Temperature High
1111SPN 111 FMI 1Engine Coolant Level Low
1113SPN 111 FMI 3 or 4Engine Coolant Level Sensor Voltage High
1114SPN 111 FMI 3 or 4Engine Coolant Level Sensor Voltage Low
1322SPN 132 PerformanceMass Air Flow (MAF) Sensor Conflict
1327SPN 132 PerformanceMass Air Flow (MAF) Sensor/Speed Density Calculation Conflict
1323SPN 132Mass Air Flow (MAF) Sensor Signal High
1324SPN 132Mass Air Flow (MAF) Sensor Signal Low
1365SPN 136Evaporative Emissions (EVAP) Module Vacuum Pump Open/Short
1573SPN 157Fuel Rail Pressure Sensor Signal Voltage High
1574SPN 157Fuel Rail Pressure Sensor Signal Voltage Low
1683SPN 168 FMI 3 or 4Evaporative Emissions (EVAP) Module Battery Voltage High
1684SPN 168 FMI 3 or 4Evaporative Emissions (EVAP) Module Battery Voltage Low
1722SPN 172 PerformanceIntake Air Temperature (IAT) Sensor Conflict
1723SPN 172Intake Air Temperature (IAT) Sensor Signal High
1724SPN 172Intake Air Temperature (IAT) Sensor Signal Low
1743SPN 174Fuel Rail Temperature Sensor Signal High
1744SPN 174Fuel Rail Temperature Sensor Signal Low
19119SPN 191Transmission Output Shaft Speed Conflict
5952SPN 595Cruise Control Switch Signal Invalid
5953SPN 595Cruise Control Switch Signal Voltage High
5954SPN 595Cruise Control Switch Signal Voltage Low
5957SPN 595Cruise Control Switch Signal Stuck
5972SPN 597Brake Switch Conflict
60911SPN 609Torque Security Module (TSM) Communication Invalid
60912SPN 609 or 3464Main Processor Heartbeat Synchronization Fault
63911SPN 639Communication Bus Is Passive
6515SPN 651–658Fuel Injector Cylinder 1 Circuit Fault
6525SPN 651–658Fuel Injector Cylinder 2 Circuit Fault
6535SPN 651–658Fuel Injector Cylinder 3 Circuit Fault
6545SPN 651–658Fuel Injector Cylinder 4 Circuit Fault
6555SPN 651–658Fuel Injector Cylinder 5 Circuit Fault
6565SPN 651–658Fuel Injector Cylinder 6 Circuit Fault
6575SPN 651–658 Fuel Injector Cylinder 7 Circuit Fault
6585SPN 651–658 Fuel Injector Cylinder 8 Circuit Fault
97019SPN 970Remote Shut Down Module Communication Invalid
12685SPN 1268–1275Ignition Coil Cylinder 1 Control Circuit Open/Short
12695SPN 1268–1275Ignition Coil Cylinder 2 Control Circuit Open/Short
12705SPN 1268–1275Ignition Coil Cylinder 3 Control Circuit Open/Short
12715SPN 1268–1275Ignition Coil Cylinder 4 Control Circuit Open/Short
12725SPN 1268–1275Ignition Coil Cylinder 5 Control Circuit Open/Short
12735SPN 1268–1275Ignition Coil Cylinder 6 Control Circuit Open/Short
12745SPN 1268–1275Ignition Coil Cylinder 7 Control Circuit Open/Short
12755SPN 1268–1275Ignition Coil Cylinder 8 Control Circuit Open/Short
132331SPN 1323–1330Misfire Cylinder 1
132431SPN 1323–1330Misfire Cylinder 2
132531SPN 1323–1330Misfire Cylinder 3
132631SPN 1323–1330Misfire Cylinder 4
132731SPN 1323–1330Misfire Cylinder 5
132831SPN 1323–1330Misfire Cylinder 6
132931SPN 1323–1330Misfire Cylinder 7
133031SPN 1323–1330Misfire Cylinder 8
13475SPN 1347Primary Fuel Pump Relay Control Circuit Open/Short
163412SPN 1634Engine Control Module (ECM) Checksum Error
17655SPN 1765Fuel By-Pass Relay Control Circuit Open/Short
17663SPN 1766Evaporative Emissions (EVAP) Purge Solenoid Control Circuit Open/Short
17665SPN 1766Evaporative Emissions (EVAP) Purge Solenoid Current Conflict
200319SPN 2003Transmission Control Module (TCM) Communication Invalid
201119SPN 2011Antilock Brake System (ABS) Module Communication Invalid
202319SPN 2023Power Take Off (PTO) Control Communication Invalid
203319SPN 2033Bulk Head Module Communication Invalid
211919SPN 2119Evaporative Emissions (EVAP) Module Communication Invalid
243214SPN 2432 FMI 14, 15, or 17Engine Control Module (ECM) Torque Rationality Diagnostic
243215SPN 2432 FMI 14, 15, or 17Engine Control Module (ECM) Mass Air Flow Torque Calculation High
243216SPN 2432 FMI 16Requested Engine Torque Low
243217SPN 2432 FMI 14, 15, or 17Engine Control Module (ECM) Mass Air Flow Torque Calculation Low
243218SPN 2432 FMI 18Requested Engine Torque High
26095SPN 2609Air Conditioning Compressor Clutch 1 Control Circuit Open/Short
26096SPN 2609Air Conditioning Compressor Clutch 2 Control Circuit Open/Short
26343SPN 2634Main Power Relay (MPR) Coil Circuit Open/Short
26345SPN 2634Main Power Relay (MPR) Self Test Failed
305018SPN 3050 or 3051Catalyst Bank A Malfunction
305118SPN 3050 or 3051Catalyst Bank B Malfunction
32173SPN 3217 or 3256HEGO Bank A Sensor 1 Voltage High
32174SPN 3217 or 3256HEGO Bank A Sensor 1 Voltage Low
32225SPN 3222 or 3261HEGO Bank A Pre catalyst Heater Circuit Open/Short
32273SPN 3227 or 3266HEGO Bank A Sensor 2 Voltage High
32274SPN 3227 or 3266HEGO Bank A Sensor 2 Voltage Low
32325SPN 3232 or 3271HEGO Bank A Post-catalyst Heater Circuit Open/Short
32563SPN 3217 or 3256HEGO Bank B Sensor 1 Voltage High
32564SPN 3217 or 3256HEGO Bank B Sensor 1 Voltage Low
32615SPN 3222 or 3261HEGO Bank B Pre-catalyst Heater Circuit Open/Short
32663SPN 3227 or 3266HEGO Bank B Sensor 2 Voltage High
32664SPN 3227 or 3266HEGO Bank A Sensor 2 Voltage Low
32715SPN 3232 or 3271HEGO Bank B Post-catalyst Heater Circuit Open/Short
34643SPN 3464 or 3664Electronic Throttle Control (ETC) Control Circuit Open/Short
34645SPN 3464 or 3664Electronic Throttle Control (ETC) Learned Value Conflict
366411SPN 3464 or 3664Electronic Throttle Control (ETC) Learned Value Conflict
346412SPN 609 or 3464Level 2 Processor Torque Security Module (TSM) Not Executed
350910SPN 3509 or 35105 Volt Reference Voltage 1 Low
350919SPN 3509 or 35105 Volt Reference Voltage 1 High
351010SPN 3509 or 35105 Volt Reference Voltage 2 Low
351019SPN 3509 or 35105 Volt Reference Voltage 2 High
35973SPN 3597Driver Output Supply Voltage High
35974SPN 3597Driver Output Supply Voltage Low
359710SPN 3597Driver Output Voltage Low
359719SPN 3597Driver Output Voltage High
42035SPN 4203 or 4204Crankshaft (CKT) Sensor Signal Error
42045SPN 4203 or 4204Camshaft (CMT) Sensor Signal Error
42367SPN 4236 or 4238Short Term Fuel Trim Fault Bank A
42387SPN 4236 or 4238Short Term Fuel Trim Fault Bank B





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