P0274
DTC P0201-P0208, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277, P0279, P0280, P0282, or P0283 (Heavy Duty L96)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC P0201
- Injector 1 Control Circuit
DTC P0202
- Injector 2 Control Circuit
DTC P0203
- Injector 3 Control Circuit
DTC P0204
- Injector 4 Control Circuit
DTC P0205
- Injector 5 Control Circuit
DTC P0206
- Injector 6 Control Circuit
DTC P0207
- Injector 7 Control Circuit
DTC P0208
- Injector 8 Control Circuit
DTC P0261
- Injector 1 Control Circuit Low Voltage
DTC P0262
- Injector 1 Control Circuit High Voltage
DTC P0264
- Injector 2 Control Circuit Low Voltage
DTC P0265
- Injector 2 Control Circuit High Voltage
DTC P0267
- Injector 3 Control Circuit Low Voltage
DTC P0268
- Injector 3 Control Circuit High Voltage
DTC P0270
- Injector 4 Control Circuit Low Voltage
DTC P0271
- Injector 4 Control Circuit High Voltage
DTC P0273
- Injector 5 Control Circuit Low Voltage
DTC P0274
- Injector 5 Control Circuit High Voltage
DTC P0276
- Injector 6 Control Circuit Low Voltage
DTC P0277
- Injector 6 Control Circuit High Voltage
DTC P0279
- Injector 7 Control Circuit Low Voltage
DTC P0280
- Injector 7 Control Circuit High Voltage
DTC P0282
- Injector 8 Control Circuit Low Voltage
DTC P0283
- Injector 8 Control Circuit High Voltage
Diagnostic Fault Information
Circuit/System Description
The control module enables the appropriate fuel injector pulse for each cylinder. Ignition voltage is supplied to the fuel injectors. The control module controls each fuel injector by grounding the control circuit via a solid state device called a driver. The control module monitors the status of each driver. If the control module detects an incorrect voltage for the commanded state of the driver, a fuel injector control circuit DTC sets.
Conditions for Running the DTC
* The engine is running.
* The ignition voltage is greater than 11 V.
* The DTCs run continuously when the above conditions are met.
Conditions for Setting the DTC
DTC P0201, P0202, P0203, P0204, P0205, P0206, P0207, or P0208
The ECM detects the control circuit is open for greater than 2 s.
DTC P0261, P0264, P0267, P0270, P0273, P0276, P0279, or P0282
The ECM detects the control circuit is shorted to ground for greater than 2 s.
DTC P0262, P0265, P0268, P0271, P0274, P0277, P0280, or P0283
The ECM detects the control circuit is shorted to voltage for greater than 2 s.
Action Taken When the DTC Sets
DTCs P0201, P0202, P0203, P0204, P0205, P0206, P0207, and P0208 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0201, P0202, P0203, P0204, P0205, P0206, P0207, and P0208 are Type B DTCs.
Diagnostic Aids
* The MIL indicator flashes when there is an engine misfire.
* High resistance in the circuits of the injectors may set a misfire DTC without setting an injector DTC. Test the injector circuits of the affected cylinder(s) for a high resistance if you suspect a condition.
* Performing the Fuel Injector Diagnosis may help isolate an intermittent condition. Refer to Fuel Injector Diagnosis (CH47976) Fuel System DiagnosisFuel Injector Diagnosis (J39021 or Scan Tool) Fuel System Diagnosis.
Reference Information
Schematic Reference
Engine Controls Schematics (except L96) [1][2]Electrical DiagramsEngine Controls Schematics (L96) [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)
Description and Operation
Fuel System Description Fuel System Description
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Special Tools
J-34730-405 - Injector Test Lamp
Circuit/System Verification
1. Engine idling, observe the following control circuit status parameters with a scan tool:
* Cyl 1-8 Injector Ckt. Short Gnd Test Status
* Cyl 1-8 Injector Ckt. Open Test Status
* Cyl 1-8 Injector Ckt. Short Volts Test Status
Each parameter should display OK or Not Run.
2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Ignition OFF, disconnect the affected fuel injector harness connector at the Q17 fuel injector.
2. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal A and ground.
• If the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition voltage circuit fuse is open, test or replace the Q17 fuel injector.
3. Connect the J-34730-405 - test lamp between the control circuit terminal B and the ignition voltage circuit terminal A.
4. Engine cranking, verify the test lamp flashes ON and OFF.
• If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 engine control module.
• If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 engine control module.
5. If all circuits test normal, test or replace the Q17 fuel injector.
Component Testing
Note: The engine coolant temperature (ECT) sensor must be between 10-32°C (50-90°F) for an accurate measurement.
1. Ignition OFF, disconnect the harness connector at the appropriate Q17 fuel injector.
2. Test for 11-14 ohms between the terminals of the fuel injector.
• If not within the specified range, replace the Q17 fuel injector.
3. Test for infinite resistance between each terminal and the fuel injector housing/case.
• If not the specified value, replace the Q17 fuel injector.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Fuel Injector Replacement Removal and Replacement
* Control Module References Control Module References for Engine Control Module replacement, programming, and setup.