Thread: EGR Code P0405
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Old 01-01-2012, 07:05 PM   #2
fdryer
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Join Date: Jan 2006
Location: NYC
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2003 L-Series 3.0L Sedan
Default Re: EGR Code P0405

From the service manual;

The exhaust gas recirculation (EGR) valve consists of a pintle valve which moves by the use of an internal solenoid and an internal position sensor (potentiometer) used to determine pintle valve position. The powertrain control module (PCM) controls the solenoid by supplying it ignition voltage whenever exhaust gas needs to be recirculated into the intake manifold. The PCM monitors the EGR solenoid and position sensor circuits for correct voltage levels at certain times. DTC P0405 sets when the EGR sensor signal voltage is below the calibrated voltage value.

Be sure you have the correct information from known good sources otherwise going on assumptions can result in confusion.

The pintle valve motor only powers up momentarily when the pintle valve is needed to be positioned so you're not likely to see 12v unless you're willing to conjure up a set up to monitor the control voltages as the egr valve operates when necessary - that's only going to occur when the engine's under load and accelerating in normal driving (not while idling/revving in place). There's also the possibility of damage to the position sensor that provides feedback signaling so the pcm knows where the pintle valve is.
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