Couldn't find much info. It's on my buddy's 2008 6.4.

 

P040D?

P040D Exhaust Gas Recirculation Temperature (EGRT) Sensor A Circuit High

 

P0400 Exhaust Gas Recirculation Flow

 

I'm sure that's it. He read it upside down. That's the sensor that's on the up-pipe behind the passenger fender well?

 

Honestly I have no idea, PM Cheezit...

 

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</td> <td class="ADVV1-HotlineArchives-RuledRows"> 1. EGR and exhaust gas temperature sensor codes will many times put the PCM into "limp" mode. Fix this code before further diagnosis.

2. Access the EGR temperature sensor A for circuit tests. The sensor is mounted in the exhaust pipe that connects to the rear of the Right Hand (RH) exhaust manifold. The harness connector should be near the rear of the RH valve cover just forward of the rear engine lifting bracket. The sensor is normally easier to access through the wheel well.

3. At the two pin connector, the Brown wire is the 5 volt reference to the sensor. The Green and White wire is the ground for the sensor. The code P040D suggests the voltage on the sensor is at or above 4.65 volts.

4. Leave the connector plugged in, turn the key on, backprobe the Brown wire with your volt meter. If the voltage is at or above 4.65 volts, backprobe a good ground to the Green and White wire.

5. If the voltage comes down with a ground supplied to the Green and White wire, repair the ground circuit or pin.

6. If the voltage remains at or above 4.65 volts, suspect an open EGT sensor or bad connection.

yes it is

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P040d sensor in passanger pipe. Remove fender liner. They do tend to get stuck in the pipe, retap the hole if needed.