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Detroit Diesel

Fault Codes for Detroit Diesel Series 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

  • These codes are for your reference only. Detroit Diesel Series 60 Engines only
  • Please note: Codes 43, 44, and 45 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 the nearest Detroit Diesel service center.
Flash CodeDescription
11VSG Sensor Input Voltage Low
12VSG Sensor Input Voltage High
13Coolant level Sensor (CLS) Voltage Low
14Oil or Coolant Temperature Sensor (OTS or CTS) Voltage High
15Oil or Coolant Temperature Sensor (OTS or CTS) Voltage Low
16Coolant Level Sensor (CLS) Voltage High
17Bypass or Throttle, Valve Position Sensor Input Voltage High
18Bypass or Throttle, Valve Position Sensor Input Voltage Low
21Throttle Position Sensor (TPS) Voltage High
22Throttle Position Sensor (TPS) Voltage Low
23Fuel Temperature Sensor (FTS) Voltage High
24Fuel Temperature Sensor (FTS) Voltage Low
25No Codes
26Auxiliary Engine Shutdown #1 or #2 Input Active
27Air Inlet or Intake Air, Temperature Sensor Input Volage High
28Air Inlet or Intake Air, Temperature Sensor Input Volage Low
31Engine Brake Output Open Circuit or Short to Ground
32CEL or SEL Short to Battery or Open Circuit
33Turbo Boost Sensor (TBS) Voltage High
34Turbo Boost Sensor (TBS) Voltage Low
35Oil Pressure Sensor (OPS) Voltage High
36Oil Pressure Sensor (OPS) Voltage Low
37Fuel Pressure Sensor (FPS) Voltage High
38Fuel Pressure Sensor (FPS) Voltage Low
41Timing Reference Sensor (TRS)
42Synchronous Reference Sensor (SRS)
43Low Coolant
44Oil or Coolant High Temperature
45Low Oil Pressure
46Low Battery Voltage
47Fuel, Air Inlet, or Turbo Boost Pressure High
48Fuel or Air Inlet Pressure Low
51EEPROM Error
52ECM - Analog to Digital Failure
53EEPROM Non-Volatile Memory Failure
54Vehicle Speed Sensor Fault
55J1939 Data Link Failure
56J1587 Data Link Failure
57J1922 Data Link Failure
61Injector Response Time Too Long
62Auxiliary Output Short ot Battery or Open Circuit or Mech Fault
63PWM Drive Short to Battery or Open Circuit
64Turbo Speed Sensor Input Fault
65Throttle Valve Position Input Fault
66Engine Knock Sensor Input Fault
67Coolant or Air Inlet Pressure Sensor Input Voltage High
68Idle Validation Switch Open Circuit or Short to Ground
71Injector Response Time Too Short
72Vehicle Overspeed
73Gas Valve Position Input Fault or ESS Fault
74Optimized Idle Safety Look Short to Ground
75ECM Battery Voltage High
76Engine Overspeed with Engine Brake
77Fuel Temperature High
81Dual Fuel BOI or Exhaust Temperature Voltage High
82Dual Fuel BOI or Exhaust Temperature Voltage Low
83Exhaust Temperature or External Pump Pressure High
85Engine Overspeed
86External Pump Pressure Sensor Input Voltage High
87External Pump Pressure Sensor Input Voltage Low