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3rd Gen Ram Tech 2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.

P0405

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Old 09-01-2006, 01:01 AM
mbennett6 mbennett6 is offline
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Default P0405

I have a P0405 code which is "Exhaust Gas Recirculation Sensor A Circuit Low" when the engine is cool and the ERG is not operating. After the engine warms up and the EGR valve is operating sometime the code changes to P0401. I have checked the EGR valve/soleniod and it appears to be operating OK. This is from an 05 Hemi. Has anyone got any idea what else could cause that error code? Does anyone know what voltage should be coming out of the ERG unit back to the PCM?
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Old 09-01-2006, 01:10 AM
Gone Fishin Gone Fishin is offline
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Default RE: P0405

Yup,

Two things.
1. Make sure the gas cap is tight
2. Check the condition of the rubber hoses that connect the lines to the charchol canister.

If they are cracked or checked at all, replace them. This has been a common DTC with many of the "few" years old rams. If its under warranty yet, have the dealership do it. I had the same problems with mine but it turned out to be the wire that fires the solenoid rubbing on one of the front end components (< not common). most often its the rubber connection lines at the canister
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Old 09-01-2006, 02:10 AM
mbennett6 mbennett6 is offline
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Default RE: P0405

I would have never associated an error with the EGR with leaks in the fuel system. I'll explore it.
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Old 09-01-2006, 09:45 AM
Gone Fishin Gone Fishin is offline
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Default RE: P0405

mbennett6,
I got my wires crossed up when I looked up the DTC code. There is a sweep (variable resistor) in the EGR that lets the computer know its position. Most likely the feedback info is incorrect. You might try pulling the connector and cleaning them good first. If after that the DTC continues to come up, replace the EGR valve
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Old 09-01-2006, 09:45 AM
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