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