OBDII Error Codes

P0008 - Engine Position System Performance Theory of Operation The Powertrain Control Module (PCM) will turn on the MIL lamp immediately after this diagnostic runs and fails. The PCM will turn off the MIL lamp after the diagnostic runs and passes in four consecutive drive cycles. When Monitored and Set Conditions When Monitored: This diagnostic runs continuously when the following conditions are met: • With the engine running. Set Conditions: • The Powertrain Co

P000F - Fuel System Over Pressure Relief Valve Activated When Monitored and Set Conditions When Monitored: This diagnostic runs continuously when the following conditions are met: With the engine running. Set Conditions: The Powertrain Control Module (PCM) has detects that the fuel pressure has deviated at a higher rate than the calibrated threshold. This DTC will cause active regeneration to be disabled. Default Actions: The MIL will illuminate.

P0016 - Crankshaft / Camshaft Timing Misalignment - Bank 1 Sensor 1 Theory of Operation The Crankshaft Position (CKP) and Camshaft Position (CMP) Sensors are hall effect type sensors. The Powertrain Control Module (PCM) provides a 5-Volt supply to the position sensor and return circuit. A notch on the crankshaft gear is used to determine the speed of the engine by the PCM. As the notch on the crankshaft speed ring or the windows in the back of the camshaft gear move past the position s

P0046 - Turbocharger Boost Control Circuit Performance Theory of Operation The Variable Geometry Turbocharger (VGT) is electronically controlled by the Electronic Turbo Actuator. The Electronic Turbo Actuator is a smart device; it communicates information with the Powertrain Control Module (PCM) over the J1939 BUS. The Electronic Turbo Actuator performs its own internal diagnostics and reports failures back to the PCM. The PCM then decodes the error message and converts it to a fault c

P0049 Turbocharger Turbine Overspeed Theory of Operation The Turbocharger Speed Sensor is a variable reluctance speed sensor. It consists of a coil of wire and an iron core. The target on the turbocharger shaft is a ground flat surface in the center of the shaft. As the flat surface on the turbocharger shaft spins past the speed sensor, a signal is generated. The Powertrain Control Module (PCM) interprets this signal and converts it to a turbocharger speed reading. The PCM will illumin

P006E - Turbocharger Boost control Supply Voltage Circuit Low Theory of Operation The Variable Geometry Turbocharger (VGT) is electronically controlled by the Electronic Turbo Actuator. The Electronic Turbo Actuator is a smart device; it communicates information with the Powertrain Control Module (PCM) over the J1939 BUS. The Electronic Turbo Actuator performs its own internal diagnostics and reports failures back to the PCM. The PCM then decodes the error message and converts it to a

P006F - Turbocharger Boost Control Supply Voltage Circuit High Theory of Operation The Variable Geometry Turbocharger (VGT) is electronically controlled by the Electronic Turbo Actuator. The Electronic Turbo Actuator is a smart device; it communicates information with the Powertrain Control Module (PCM) over the J1939 BUS. The Electronic Turbo Actuator performs its own internal diagnostics and reports failures back to the PCM. The PCM then decodes the error message and converts it to a

P0071 - Ambient Air Temperature Sensor Performance Theory of Operation The Ambient Air Temperature (AAT) Sensor is located in the driver's door mirror. The Driver's Door Module (DDM) receives the data from the AAT sensor and sends it to the Body Control Module (BCM). The BCM then passes the data on to the Powertrain Control Module (PCM). There are two rationality tests. The first test is: Ignition on/engine running. The second test is: After an eight hour cold soak, at key on the readi

P0072 - Ambient Air Temperature Sensor Circuit Low Theory of Operation The Ambient Air Temperature (AAT) Sensor is located in the driver's door mirror. The Driver's Door Module (DDM) receives the data from the AAT sensor and sends it to the Body Control Module (BCM). The BCM then passes the data on to the Powertrain Control Module (PCM). There are two rationality tests. The first test is: Ignition on/engine running. The second test is: After an eight hour cold soak, at key on the readi

P0073 - Ambient Air Temperature Sensor Circuit High Theory of Operation The Ambient Air Temperature (AAT) Sensor is located in the driver's door mirror. The Driver's Door Module (DDM) receives the data from the AAT sensor and sends it to the Body Control Module (BCM). The BCM then passes the data on to the Powertrain Control Module (PCM). There are two rationality tests. The first test is: Ignition on/engine running. The second test is: After an eight hour cold soak, at key on the read

P007B - Charge Air Cooler Temperature Sensor Circuit Performance Theory of Operation The Charge Air Cooler Temperature Sensor circuit is represented as the Intake Manifold Temperature Sensor circuit on the Cab and Chassis. On the Regular Cab it is still called the Charge Air Cooler Temperature Sensor circuit. In both configurations, this DTC refers to the circuit that runs from the Powertrain Control Module (PCM) C1 harness connector / terminal 62 to the Temperature/Pressure MAP sensor

P007C - Charge Air Cooler Temperature Sensor Circuit Low Theory of Operation The Charge Air Cooler Temperature Sensor circuit is represented as the Intake Manifold Temperature Sensor circuit on the Cab and Chassis. On the Regular Cab it is still called the Charge Air Cooler Temperature Sensor circuit. In both configurations, this DTC refers to the circuit that runs from the Powertrain Control Module (PCM) C1 harness connector / terminal 62 to the Temperature/Pressure MAP sensor / termi

P007D - Charge Air Cooler Temperature Sensor Circuit High Theory of Operation The Charge Air Cooler Temperature Sensor circuit is represented as the Intake Manifold Temperature Sensor circuit on the Cab and Chassis. On the Regular Cab it is still called the Charge Air Cooler Temperature Sensor circuit. In both configurations, this DTC refers to the circuit that runs from the Powertrain Control Module (PCM) C1 harness connector / terminal 62 to the Temperature/Pressure MAP sensor / term

P0087 - Fuel Rail Pressure Too Low  Special Tools: Click to display a list of tools used in this procedure When Monitored and Set Conditions When Monitored: This diagnostic runs continuously when the following conditions are met: • With the engine running. Set Conditions: • The Powertrain Control Module (PCM) detects that the actual fuel pressure reading is below a calibrated threshold. This DTC will cause active regeneration to be disabled. Default Actions: • The

P0088 - Fuel Rail Pressure Too High - Bank 1 Theory of Operation The Powertrain Control Module (PCM) provides the Fuel Rail Pressure Sensor with a 5-Volt supply and sensor ground, and receives a signal voltage back from the Fuel Rail Pressure Sensor. This sensor signal voltage changes based on the pressure in the fuel rail. The PCM will light the MIL lamp immediately after the diagnostic runs and fails. During this time the customer may experience a power and or speed derate. The

P008A - Low Fuel Pressure Fuel System Pressure - Too Low When Monitored and Set Conditions When Monitored: This diagnostic runs continuously when the following conditions are met: • With the engine running.   Set Conditions: • The Powertrain Control Module (PCM) detects that the Low Pressure Fuel Delivery pressure is below a calibrated value for a calibrated amount of time.   Default Actions: • The MIL is illuminated. Possible Causes HIGH PRESSURE FU

P0093 - Fuel System Leak Detected - Large Leak Theory of Operation The Powertrain Control Module (PCM) determines that there is a leak in the Low Pressure Fuel Delivery system based on inputs from the High Pressure Fuel system, Fuel Tank Level Signal, Emissions systems, and other engine conditions. The PCM will turn on the MIL on after this diagnostic runs and fails for two consecutive drive cycles. This DTC will cause active regeneration to be disabled. When Monitored and S

P00AF - Turbocharger Boost Control Module Performance Theory of Operation The Variable Geometry Turbocharger (VGT) is electronically controlled by the Electronic Turbo Actuator. The Electronic Turbo Actuator is a smart device; it communicates information with the Powertrain Control Module (PCM) over the J1939 BUS. The Electronic Turbo Actuator performs its own internal diagnostics and reports failures back to the PCM. The PCM then decodes the error message and converts it to a fault co

P0101 - Mass Air Flow Sensor "A" Circuit Performance Theory of Operation The Mass Air Flow (MAF) Sensor is a frequency based device. A constant voltage is applied to a heated wire. This wire is positioned in the air stream and is heated by the electrical current that the voltage produces. As air flows across it, it cools down. The heated wire or film is a Positive Temperature Coefficient (PTC) resistor, which means that the resistance of it drops when the temperature drops. The drop in

P0102 - Mass Air Flow Sensor "A" Circuit Low Theory of Operation The Mass Air Flow (MAF) Sensor is a frequency based device. A constant voltage is applied to a heated wire. This wire is positioned in the air stream and is heated by the electrical current that the voltage produces. As air flows across it, it cools down. The heated wire or film is a Positive Temperature Coefficient (PTC) resistor, which means that the resistance of it drops when the temperature drops. The drop in resista

P0103 - Mass Air Flow Sensor "A" Circuit High Theory of Operation The Mass Air Flow (MAF) Sensor is a frequency based device. A constant voltage is applied to a heated wire. This wire is positioned in the air stream and is heated by the electrical current that the voltage produces. As air flows across it, it cools down. The heated wire or film is a Positive Temperature Coefficient (PTC) resistor, which means that the resistance of it drops when the temperature drops. The drop in resist

P0106 - Manifold Absolute Pressure Sensor Performance Theory of Operation The Charge Air Cooler Temperature Sensor (CAC) and the Boost Pressure Sensor are combined in one sensor. This combination sensor is called the Temperature/Pressure MAP Sensor. It is located on the EGR Airflow Throttle Control Valve on the Regular Cab. For the Cab and Chassis, it is located on the Intake Manifold. The Cab and Chassis version also receives the Intake Manifold Temperature signal. The Regular Cab sti

P0107 - Manifold Absolute Pressure Sensor Circuit Theory of Operation The Charge Air Cooler Temperature Sensor (CAC) and the Boost Pressure Sensor are combined in one sensor. This combination sensor is called the Temperature/Pressure MAP Sensor. It is located on the EGR Airflow Throttle Control Valve on the Regular Cab. For the Cab and Chassis, it is located on the Intake Manifold. The Cab and Chassis version also receives the Intake Manifold Temperature signal. The Regular Cab still h

P0108 - Manifold Absolute Pressure Sensor Circuit High Theory of Operation The Charge Air Cooler Temperature Sensor (CAC) and the Boost Pressure Sensor are combined in one sensor. This combination sensor is called the Temperature/Pressure MAP Sensor. It is located on the EGR Airflow Throttle Control Valve on the Regular Cab. For the Cab and Chassis, it is located on the Intake Manifold. The Cab and Chassis version also receive the Intake Manifold Temperature signal. The Regular Cab sti

P0111 - Intake Air Temperature Sensor 1 Performance Theory of Operation The Intake Manifold Temperature (IMT) Sensor is located on the intake manifold on the Regular Cab. For the Cab and Chassis, it is a part of the Temperature/Pressure MAP Sensor. The IMT Sensor is used to measure the temperature of the air in the intake manifold. The Powertrain Control Module (PCM) supplies 5-Volts to the intake manifold temperature signal circuit. The PCM monitors the change in voltage caused by cha