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2002 Saturn SC2 Fault Codes P0341, P0404, and P1404: Causes and Diagnosis Guide

Model: Saturn SC2 Fault Code: P0341 Posted: 2006-08-04 15:40

I own a 2002 Saturn SC2 with a 1.9L DOHC engine and am currently experiencing three diagnostic trouble codes simultaneously: P0341, P0404, and P1404. I have gathered some information on P0404 but only limited details about P0341, and no clear guidance on P1404. P0404 indicates an exhaust gas recirculation (EGR) system performance issue. The EGR system reduces nitrogen oxide emissions by reintroducing a small amount of exhaust gas into the combustion chamber, which lowers combustion temperatures. In this vehicle, a linear EGR valve is used—controlled by a module that applies a 12-volt duty cycle to the valve. A sensor monitors pintle position via a variable resistor with a 5V reference; changes in voltage reflect pintle movement. P1404 is GM's proprietary code for an EGR valve stuck open, typically caused by carbon buildup or foreign material lodged in the pintle seating area. The vehicle’s control module attempts to clear the valve by commanding it fully open while driving at cruising speed. If this fails after three attempts, P1404 will be set. P0341 relates to a camshaft position sensor malfunction. While Saturn SC2 models do not have a traditional camshaft position sensor, the code may appear due to engine misfires or irregular combustion patterns—often linked to EGR system faults. Misfiring can result from an improperly functioning EGR valve that disrupts air-fuel mixture balance. To diagnose these issues: - Use an OBD2 scanner to verify EGR valve position and command signals. - Inspect the EGR valve physically for carbon buildup or debris, especially in the pintle area. - If equipped with a linear EGR valve, test its operation using a scan tool to confirm pintle movement. - For vacuum-operated valves, apply vacuum manually—engine should stall if the valve is stuck open. I suspect that resolving the EGR issue may fix both P0404 and P0341 due to their interrelated nature. Any guidance on how to safely test or clean the EGR system would be greatly appreciated.

Related fault codes
P0341P0404P1404
Comments (4)
Anonymous 2006-09-19 08:54

From http://www.saturnfans.com/forums/showthread.php?t=28313: "An exhaust gas recirculation (EGR) system reduces nitrogen oxide emissions by feeding exhaust gases back into the combustion chamber, diluting the air/fuel mixture and lowering combustion temperatures. The 2002 Saturn SC2 uses a linear EGR valve that operates via a control module applying a 12-volt duty cycle to the pintle valve. A sensor monitors pintle position using a variable resistor with a 5V reference, measuring voltage changes as the pintle moves. Diagnostic code P1404 is triggered when the EGR pintle fails to return to its learned closed position after three attempts to clear it via full valve opening at cruising speed. This can be caused by carbon buildup or foreign material in the pintle seating area. "

Anonymous 2006-09-19 10:06

P1404 is GM's official code for an EGR valve stuck open. The 2002 Saturn SC2 does not have a traditional camshaft position sensor, so P0341 may appear due to engine misfires caused by EGR malfunction. Fixing the EGR issue often resolves both P0404 and P0341.

Anonymous 2006-09-20 11:46

Can a faulty EGR valve cause engine misfiring? I've never had an EGR-related issue before, so I'm curious. Is there a way to test the EGR valve without removing it—such as measuring resistance with a multimeter? If carbon is lodged in the pintle, would that be visible when the EGR valve is removed from the manifold? Any advice on diagnosing this would be helpful.

Anonymous 2006-09-20 12:15

Yes, a malfunctioning EGR valve can cause misfires. For linear EGR valves, you'll need an OBD2 scanner to command the valve and verify pintle movement. If it's vacuum-operated, applying vacuum with a hand pump should cause the engine to stall if the valve is stuck open. Carbon buildup is common in GM engines—especially on older models like this one. Modern EGR gaskets include screens to prevent carbon accumulation. My guess is your issue may be simple carbon buildup. Good luck and please update if you find a resolution.