George

[dixieshack]

I have a 2007 /2500 with 6. 7. My engine light came on and the following codes P2141,P0102,P0488,P0487,P2A00,P2A01,U010C,PZ45A and P0471. The truck seems to work OK Would anyone have any idea what would cause all these codes to come at once???? This is working unit with 907,000 Km on it with no major problems.

 

[rbattelle]

I don't know the codes for 2007, but in the meantime you might want to post some historical details about the truck. Is it bone stock?

-Ryan

 

[dlmetzger]

P0102-MASS AIR FLOW SENSOR "A" CIRCUIT LOW



Theory of Operation

The Mass Air Flow 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. This means that it's resistance drops when it's temperature drops. The drop in resistance allows more current to flow through it in order to maintain the programmed temperature. This current is changed to a frequency which is sent to the ECM and interpreted as air flow. Adjustments for air temperature and humidity are taken into consideration since they also affect the temperature of the heated wire or film. This diagnostic has two parts, a key on monitor and a monitor that runs in operating conditions when the EGR valve is closed. The key on monitor diagnostic fails if the Mass Air Flow Sensor reads a non-zero value at key on, engine off. The engine running monitor compares an estimated charge air flow value to the Mass Air Flow sensor reading. This monitor only runs when the EGR valve is commanded closed. During this time the MAF sensor value should equal the charge air flow estimate. The ECM will light the MIL lamp immediately after this diagnostic runs and fails. The ECM will turn off the MIL lamp when the diagnostic runs and passes in four consecutive drive cycles.





P0471-EXHAUST PRESSURE SENSOR 1 PERFORMANCE



Theory of Operation

The exhaust gas pressure sensor is used to measure exhaust gas pressure in the exhaust manifold. The Electronic Control Module (ECM) provides a 5-volt supply to the exhaust gas pressure sensor on the sensor supply circuit. The ECM also provides a ground on the sensor return circuit. The exhaust gas pressure sensor provides a signal to the ECM on the exhaust gas pressure sensor signal circuit. This sensor signal voltage changes based on the pressure in the exhaust manifold. There are two parts to this fault code, a key on check and a rationality check. At key ON, the readings for the exhaust gas pressure, intake manifold pressure and ambient air pressure are compared. This fault code occurs if the exhaust gas pressure reading is different from the other two. This diagnostic is run 5 seconds after key on. During normal engine operation EGR position and Boost Pressure sensor readings are used to calculate an estimated exhaust pressure. If the difference between the value read from the exhaust pressure sensor and the estimated is above a calibrated threshold for a calibrated period of time then an error is recorded. The key-on portion of the rationality will light the MIL immediately after the diagnostic runs and fails. The rationality portion has to fail in two consecutive drive cycles for the MIL to become illuminated. If this fault becomes active the ECM will light the MIL light immediately. During this time the ECM uses an estimated exhaust gas pressure. The ECM turns off the MIL when the diagnostic runs and passes in 4 consecutive drive cycles.





P0487-EGR AIRFLOW THROTTLE CONTROL CIRCUIT A OPEN



Theory of Operation

The EGR Airflow Throttle is a smart device that is commanded by the ECM through a PWM signal. This is a completely modulated device. When feedback does not match commanded for more than 2 seconds this algorithm fails. The ECM will light the MIL lamp immediately after this diagnostic runs and fails. During this time the EGR Airflow Throttle is disabled and goes to the fully open position (if possible). Active Aftertreatment regenerations make take longer if this condition exists. The ECM will turn off the MIL lamp after the diagnostic runs and passes in 4 consecutive drive cycles.



P0488-EGR AIRFLOW THROTTLE CONTROL CIRCUIT PERFORMANCE



Theory of Operation

The EGR Airflow control valve is a smart device that is commanded by the ECM through a PWM signal. There are two portions to this diagnostic, a key-on portion and a performance portion. The key-on portion checks the status feedback line from the throttle. At key-on, the ECM toggles the output line and verifies that the status line matches the command. The performance portion checks the status line for a feedback that matches the ECM output command. The diagnostic fails if the status line stays low for more than 2 seconds. The ECM will illuminate the MIL lamp after the diagnostic runs and fails in two consecutive drive cycles. During this time the ECM will not control the EGR Airflow control valve. If able, the EGR Airflow control valve will go to the default open position. This may cause active Exhaust Aftertreatment regenerations to last longer. The ECM will turn off the MIL lamp after the diagnostic runs and passes in 4 consecutive drive cycles.





P2141-EGR AIRFLOW THROTTLE CONTROL CIRCUIT LOW



Theory of Operation

The EGR Airflow Throttle is a smart device that is commanded by the ECM through a PWM signal. This is a completely modulated device. The ECM will light the MIL lamp immediately after this diagnostic runs and fails. The ECM will turn off the MIL lamp after the diagnostic runs and passes in 4 consecutive drive cycles.



PZ45A - No such diagnostic trouble code. Are you sure the 'Z' is not a '2'?



P245A-EGR COOLER BYPASS CONTROL CIRCUIT /OPEN



Theory of Operation

The EGR Cooler bypass valve is used to bypass the EGR cooler when the engine is in an active regeneration mode. This is to prevent EGR cooler fouling. There are two portions to this diagnostic. At key on the ECM drives the control line low and then high and monitors the correct status response. Throughout engine operation looks for status response voltage to be within 5-8 volts. The EGR Cooler Bypass valve will send a signal between 1. 0 and 1. 7 volts. When this occurs the ECM logs a fault. The second portion of this diagnostic monitors Exhaust Gas Recirculation temperature. If the EGR Cooler Bypass valve was in bypass mode incorrectly, the exhaust gas recirculation temperatures would exceed a temperature limit; this condition will also trigger the fault. The ECM will light a MIL lamp immediately after this diagnostic runs and fails. The ECM will turn off the MIL lamp after the diagnostic passes in four consecutive drive cycles





P2A00-O2 SENSOR 1/1 CIRCUIT PERFORMANCE



Theory of Operation

The engine aftertreatment system monitors the O2 content in the diesel engine exhaust. The ECM monitors the exhaust gases for oxygen content and varies the rich/lean fuel mixture of the intake air fuel mixture to adjust the system. This diagnostic checks to make sure that the O2 content matches the expected O2 content for the engine operating conditions. The ECM will set the fault if it detects that the actual O2 measurement does not match the expected value. The ECM will illuminate the MIL lamp immediately when the diagnostic runs and fails. The ECM will turn off the MIL lamp diagnostic runs and passes in four consecutive drive cycles.





P2A01-O2 SENSOR 1/2 CIRCUIT PERFORMANCE



Theory of Operation

The engine aftertreatment system monitors the O2 content in the diesel engine exhaust. The ECM monitors the exhaust gases for oxygen content and varies the rich/lean fuel mixture of the intake air fuel mixture to adjust the system. This diagnostic checks to make sure that the O2 content matches the expected O2 content for the engine operating conditions. The ECM will set the fault if it detects that the actual O2 measurement does not match the expected value. The ECM will illuminate the MIL lamp immediately when the diagnostic runs and fails. The ECM will turn off the MIL lamp diagnostic runs and passes in four consecutive drive cycles.





U010C-LOST COMMUNICATION WITH TURBOCHARGER/SUPERCHARGER CONTROL MODULE



Theory of Operation

The variable geometry turbocharger (VGT) is electronically activated by the VGT actuator. The VGT actuator is a smart device that receives information via the J1939 datalink from the primary engine electronic control module (ECM). The VGT actuator performs its own diagnostics and reports failures back to the primary engine ECM using the J1939 datalink.

 

[rbattelle]

Looks to me like whatever controls the EGR system crapped out.

-Ryan

 

[HHhuntitall]

... . or a wireloom is unplugged or severed.

 

[steved]

... . or a wireloom is unplugged or severed.

... or has worn spot in the insulation... causing a short.

 

[dixieshack]

Thanks for all the replies Toke truck to local garage and they found the problem was a bad fuse. . Donot know the name but it was the fuse at the top of box when looking down.



george

 

[steved]

Something caused it to fail... .