OPERATING INSTRUCTIONS
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Engine Codes: Cummins Engine Model QSB6.7
ENGINE DIAGNOSTIC CODES
Displayed Code
Definition
111
Engine Control Module
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Critical Internal Failure
115
Engine Speed/Position Sensor Circuit
−
Lost Both of Two Signals
122
Intake Manifold Pressure Sensor Circuit
−
Voltage Above Normal, or Shorted High
123
Intake Manifold Pressure Sensor Circuit
−
Voltage Below Normal, or Shorted Low
135
Engine Oil Pressure Sensor Circuit
−
Voltage Above Normal, or Shorted High
141
Engine Oil Pressure Sensor Circuit
−
Voltage Below Normal, or Shorted Low
143
Engine Oil Pressure Low
−
Warning
144
Engine Coolant Temperature Sensor Circuit
−
Voltage Above Normal, or Shorted High
145
Engine Coolant Temperature Sensor Circuit
−
Voltage Below Normal, or Shorted Low
146
Engine Coolant Temperature High
−
Warning
147
Frequency Throttle Signal
−
Abnormal Frequency, Pulse Width, or Period
148
Frequency Throttle Signal
−
Abnormal Frequency, Pulse Width, or Period
151
Engine Coolant Temperature High
−
Critical
153
Intake Manifold Temperature Sensor Circuit
−
Voltage Above Normal, or Shorted High
154
Intake Manifold Temperature Sensor Circuit
−
Voltage Below Normal, or Shorted Low
155
Intake Manifold Air Temperature High
−
Critical
187
Sensor Supply Voltage #2 Circuit
−
Voltage Below Normal, or Shorted Low
195
Engine Coolant Level Sensor Circuit
−
Voltage Above Normal, or Shorted High
196
Engine Coolant Level Sensor Circuit
−
Voltage Below Normal, or Shorted Low
197
Engine Coolant Level Low
−
Warning
212
Engine Oil Temperature Sensor 1 Circuit
−
Voltage Above Normal, or Shorted High
213
Engine Oil Temperature Sensor 1 Circuit
−
Voltage Below Normal, or Shorted Low
214
Engine Oil Temperature High
−
Critical
221
Barometric Pressure Sensor Circuit
−
Voltage Above Normal, or Shorted High
222
Barometric Pressure Sensor Circuit
−
Voltage Below Normal, or Shorted Low
227
Sensor Supply Voltage #2 Circuit
−
Voltage Above Normal, or Shorted High
231
Engine Coolant Pressure Sensor Circuit
−
Voltage Above Normal, or Shorted High
232
Engine Coolant Pressure Sensor Circuit
−
Voltage Below Normal, or Shorted Low
233
Engine Coolant Pressure Low
−
Warning
234
Engine Speed High
−
Cricital
235
Engine Coolant Level Low
−
Critical
238
Sensor Supply Voltage #3 Circuit
−
Voltage Below Normal, or Shorted Low
249
Ambient Air Temperature Sensor Circuit
−
Voltage Above Normal, or Shorted High
256
Ambient Air Temperature Sensor Circuit
−
Voltage Below Normal, or Shorted Low
261
Engine Fuel Temperature High
−
Warning
263
Engine Fuel Temperature Sensor 1 Circuit
−
Voltage Above Normal, or Shorted High
265
Engine Fuel Temperature Sensor 1 Circuit
−
Voltage Below Normal, or Shorted Low
268
Fuel Pressure Sensor Circuit
−
Data Incorrect
271
High Fuel Pressure Solenoid Valve Circuit
−
Voltage Below Normal, or Shorted Low
272
High Fuel Pressure Solenoid Valve Circuit
−
Voltage Above Normal, or Shorted High
275
Fuel Pumping Element (Front)
−
Mechanical System Malfunction
281
High Fuel Pressure Solenoid Valve
−
Mechanical System Malfunction
284
Engine Speed/Position Sensor (Crankshaft) Circuit
−
Voltage Below Normal, or Shorted Low
285
SAE J1939 Multiplexing PGN Timeout Error