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Question

EVAP Control System codes P0456, P0440, P0441, what is it and can I fix it, How?

Optional Information:
2003 Dodge RAM 5.7L HEMI

Already Tried:
Failed MD emissions test

Submitted: 1390 days and 16 hours ago.
Category: Car
Value: $8
Status: CLOSED

Accepted Answer

Hello these codes are a result of a faulty internal switch inside the natural vacuum leak detection module. (NVLD).#2 in the picture. I have seen this many times. If this helped an accept is appreciated.

REMOVAL

The NVLD pump and filter are attached to the front of the EVAP canister mounting bracket This is located near the front of the fuel tank. The pump and filter are replaced (serviced) as one unit.

  1. Raise and support vehicle.
  2. Carefully remove pump hose clamp and hose at filter.
  3. Carefully remove other vapor/vacuum hose at pump.
  4. Disconnect 3–way electrical connector at pump.
  5. The NVLD pump snaps onto the EVAP canister mounting bracket. Press on release tab while sliding pump from bracket.
  6. View Full Image

Expert: Brian W.
Pos. Feedback: 98.3 %
Accepts: 
Answered: 2/1/2006

Master Auto Technician

Chrysler Gold Certified Technician

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