Fault Codes for Detroit Diesel Series 50/60 Engines

Have you ever wondered what those engine codes mean when you have a check-engine light on in your truck?

Well, wonder no more because the following codes are supplied as a trouble-shooting guide for mechanics. These codes are not for the faint-of-heart, and you should always have your truck serviced by a qualified professional.  Please note the following:

  • These codes are for your reference only. Detroit Diesel Series 60 Engines only;
  • Codes 43, 44,45,51 and 53 are critical codes and if they are shown; the Stop Engine Light will come on which causes the engine protections to engage and your engine may shut down.
  • All other codes will cause the Check Engine Light to come on which will not engage the engine protections and will allow the engine to continue running;
  • If any of these codes are shown, please contact us @ 616-291-1177.

   Flash Codes                                                      Description

          11      VSG Sensor Input Voltage Low

          12      VSG Sensor Input Voltage High

          13      Coolant level Sensor (CLS) Voltage Low

          14      Oil or Coolant Temperature Sensor (OTS or CTS) Voltage High

          15      Oil or Coolant Temperature Sensor (OTS or CTS) Voltage Low

          16      Coolant Level Sensor (CLS) Voltage High

          17       Bypass or Throttle, Valve Position Sensor Input Voltage High

          18       Bypass or Throttle, Valve Position Sensor Input Voltage Low

          21       Throttle Position Sensor (TPS) Voltage High

          22       Throttle Position Sensor (TPS) Voltage Low

          23       Fuel Temperature Sensor (FTS) Voltage High

          24       Fuel Temperature Sensor (FTS) Voltage Low

          25       No Codes

          26       Auxiliary Engine Shutdown #1 or #2 Input Active

          27       Air Inlet or Intake Air, Temperature Sensor Input Voltage High

          28       Air Inlet or Intake Air, Temperature Sensor Input Voltage Low

          31       Engine Brake Output Open Circuit or Short to Ground

          32       CEL or SEL Short to Battery or Open Circuit

          33       Turbo Boost Sensor (TBS) Voltage High

          34       Turbo Boost Sensor (TBS) Voltage Low

          35       Oil Pressure Sensor (OPS) Voltage High

          36       Oil Pressure Sensor (OPS) Voltage Low

          37        Fuel Pressure Sensor (FPS) Voltage High

          38        Fuel Pressure Sensor (FPS) Voltage Low

          41        Timing Reference Sensor (TRS)

          42        Synchronous Reference Sensor (SRS)

          43         Low Coolant

          44         Oil or Coolant High Temperature

          45         Low Oil Pressure

          46         Low Battery Voltage

          47         Fuel, Air Inlet, or Turbo Boost Pressure High

          48         Fuel or Air Inlet Pressure Low

          51         EEPROM Error

          52         ECM – Analog to Digital Failure

          53         EEPROM Non-Volatile Memory Failure

          54         Vehicle Speed Sensor Fault

          55         J1939 Data Link Failure

          56         J1587 Data Link Failure

          57         J1922 Data Link Failure

          61         Injector Response Time Too Long

          62         Auxiliary Output Short or Battery or Open Circuit or Mech Fault

          63         PWM Drive Short to Battery or Open Circuit

          64         Turbo Speed Sensor Input Fault

          65         Throttle Valve Position Input Fault

          66         Engine Knock Sensor Input Fault

          67         Coolant or Air Inlet Pressure Sensor Input Voltage High

          68         Idle Validation Switch Open Circuit or Short to Ground

          71         Injector Response Time Too Short

          72         Vehicle Overspeed  

          73         Gas Valve Position Input Fault or ESS Fault

          74         Optimized Idle Safety Look Short to Ground

          75          ECM Battery Voltage High

          76          Engine Overspeed with Engine Brake

          77          Fuel Temperature High

          81          Dual Fuel BOI or Exhaust Temperature Voltage High

          82          Dual Fuel BOI or Exhaust Temperature Voltage Low

          85          Engine Overspeed

          86          External Pump Pressure Sensor Input Voltage High

          87          External Pump Pressure Sensor Input Voltage Low