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2008 Dodge Ram 1500 5.7L Fault Codes P0403 and P0443: Causes, Diagnosis, and Fixes

Model: 2008 Dodge Ram 1500 5.7L Fault Code: P0403 Posted: 2017-08-05 20:25

I own a 2008 Dodge Ram 1500 with a 5.7L engine. The Check Engine Light (MIL) activated, and fault codes P0403 and P0440 were detected. I have already replaced both the EGR valve and the EVAP system purge valve. Despite these replacements, the MIL remains on. A dealer suggested a possible wiring issue, but this seems unlikely since P0403 (EGR System Performance) and P0443 (EVAP Canister Pressure Sensor Circuit) are separate systems and both triggered simultaneously. I have thoroughly inspected the vehicle for EVAP system leaks and found none. What steps should I take to resolve these codes or reset them? Any insights on potential underlying causes would be greatly appreciated.

Related fault codes
P0403P0443
Comments (2)
Anonymous 2017-08-06 07:41

If the replacement parts were OEM, the dealer's concern about a wiring issue is plausible. Properly installed components should eliminate such faults, so wiring continuity or connections may still need verification.

Anonymous 2017-08-06 16:52

Both replaced parts are original Mopar OEM components, which increases confidence in the repair quality and suggests that the issue may lie elsewhere in the system, such as sensor readings or electronic control module communication.