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06 CTS EVAP Purge valve


mweston63

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Have a 06 CTS with the 3.6L. Check engine light came on, and as P0496 (EVAP system flow during non purge). I replaced the purge valve on the intake, and inspected the hose to the intake from the valve. I blew it out, and it had very little carbon/trash in it. The code and check engine light is still active. Does it have to cycle to clear the fault? Am i missing something? Do I have to clean another sensor or clean the intake? I filled the tank and drove around for 30 min, and it's still on. I am going to wait a few days, unless someone has a better suggestion.

Thanks,

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We very recently had a member with the exact same problem check this thread

http://caddyinfo.ipbhost.com/index.php?showtopic=24101

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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We very recently had a member with the exact same problem check this thread

http://caddyinfo.ipbhost.com/index.php?showtopic=24101

I saw that thread before I posted, but didn't see if they fixed the problem themself. It's purging, the valve was not working, i could blow right through it. Didn't know how long it would take engine to reset the code on it's own. I only have the one fault code, as well.

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Have you tried to clear your codes? While I know you dont have an intermittant condition, I thought you might get some ideas from this list

Intermittent Conditions

DEFINITION: The condition is not currently present but is indicated in DTC history.

OR

There is a customer concern, but the symptom cannot currently be duplicated, if the condition is not DTC related.

Preliminary

The fault must be present to locate a condition using the DTC table. If a condition is intermittent, the use of DTC tables may result in the replacement of good parts.

Inspect the engine control system grounds for being clean, tight, and in the correct locations. Refer to Engine Controls Schematics . Ensure the resistance between the engine control module (ECM) housing and the battery negative cable is less than 0.5 ohms.

Visual/Physical

This step is an important aid for locating a condition without extensive testing. Perform a thorough inspection of the following items:

Inspect the wiring harness for damage.

Inspect for a mis-routed harness that is too close to high voltage or high current devices such as the following:

Secondary ignition components

Motors and generators--These components may induce electrical noise on a circuit which can interfere with normal circuit operation.

Inspect the vacuum hoses for splits or kinks. Verify that the connections and routing are as shown on the Vehicle Emission Control Information label. Refer to Emission Hose Routing Diagram .

Inspect for air leaks at the throttle body mounting and intake manifold sealing surfaces.

Inspect for air leaks at the air cleaner outlet resonator and verify the correct installation of the mass air flow (MAF) sensor. Refer to Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor Replacement .

Verify that the ECM grounds and the body grounds are clean, tight, and in the correct locations. Ensure the resistance between the ECM housing and the battery negative cable is less than 0.5 ohms.

Verify that the ECM and ECM bracket fasteners are at the correct torque.

Verify the battery connections are clean and tight.

Test the charging system for the correct operation. Refer to Symptoms - Engine Electrical in Engine Electrical.

Harness/Connector Inspection

Many intermittent conditions occur with harness/connector movement caused by vibration, engine torque, rough pavement, or component operation. Refer to Testing for Electrical Intermittents in Wiring Systems.

Excessive circuit resistance can cause a component to be inoperative. If a component does not respond to a scan tool command, test the related circuits for excessive resistance. Refer to Testing for Continuity in Wiring Systems.

Intermittent malfunction indicator lamp (MIL) with NO DTCs

The following conditions may cause an intermittent malfunction indicator lamp (MIL) and no DTCs:

Electromagnetic interference (EMI) caused by a malfunctioning relay, ECM controlled solenoid, or switch

The incorrect installation of non-factory or aftermarket add-on accessories such as cellular phones, alarms, lights, or radio equipment

The MIL control circuit is intermittently shorted to ground.

The ECM grounds are loose.

Temperature Sensitivity

An intermittent condition may occur only when the component is cold or only when the component is hot. The heat that affects the circuit can be engine generated or due to a poor connection in the circuit or a high electrical load.

Information from the customer may help to determine if the condition follows a pattern that is temperature related. The Freeze Frame/Failure Records or Snapshot data may help with this type of intermittent condition, where applicable.

If the intermittent is related to heat, review the data for a relationship with the following:

High ambient temperatures

Underhood/engine generated heat

Circuit generated heat due to a poor connection or high electrical load

Higher than normal load conditions (towing, etc.)

If the intermittent is related to cold, review the data for the following:

Low ambient temperatures--In extremely low temperatures, ice may form in a connection or component. Inspect for water intrusion.

The condition only occurs on a cold start.

The condition goes away when the engine warms up.

Duplicating Failure Conditions

Attempt to duplicate and/or capture the failure conditions. Freeze Frame/Failure Records data contains the conditions that are present when a DTC sets.

Operate the vehicle within the same conditions that you observed in the Freeze Frame/Failure Records. The vehicle must also be operating within the Conditions for Running the DTC. Refer to Conditions for Running the DTC in the supporting text of the DTC being diagnosed.

Monitor DTC Status for the DTC being tested. The scan tool will indicate Ran when the enabling conditions have been satisfied long enough for the DTC to run. The scan tool will also indicate whether the DTC Passed or Failed.

The scan tool can be set up to take a snapshot of parameters. The Snapshot function records live data over a period of time. The recorded data can be played back and analyzed. The scan tool can also graph parameters individually or in a combination with other parameters for comparison. The Snapshot can be triggered manually at the time the symptom is noticed, or set up in advance to trigger when the DTC sets. An abnormal value captured in the recorded data may point to a system or component that requires further investigation. Refer to scan tool user instructions for more information on the Snapshot function.

An alternate method is to drive the vehicle with a DMM connected to a suspected circuit. An abnormal reading on the DMM when the problem occurs may help you locate the problem.

Additional Inspections

Some electrical components and circuits are sensitive to EMI or other types of electrical noise. Inspect for the following conditions:

A mis-routed harness that is too close to high voltage and high current devices such as secondary ignition components, motors, generator--These components may induce electrical noise on a circuit that could interfere with normal circuit operation.

Electrical system interference caused by a relay, ECM driven solenoid, or switch--The component can cause a sharp electrical surge. Normally, the condition occurs when the component is operating.

Incorrect installation of non-factory, aftermarket, add-on accessories such as lights, 2-way radios, amplifiers, electric motors, remote starters, alarm systems, cell phones

Test for an open diode across the A/C compressor clutch and for other open diodes. Some relays may contain a clamping diode or resistor.

Test the generator for a faulty rectifier bridge that may allow AC noise into the electrical system. Refer to Symptoms - Engine Electrical in Engine Electrical.

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Thanks, I wont' be able to clear the codes until next week, when I get a new scantool. I did research and say that it has to do one or two diagnostic tests, the fuel needs to be 15-85% full, and at idle, and probably during a cold startup. I will wait a few days and see. Unless there is some crazy way to clear fault codes without a service tool.

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Its not the recommended method, but you could disconnect the negative battery cable

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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  • 4 weeks later...
How long ago was the replacement done? It should clear itself after 3 ignition cycles with no fault detected.

It's been a couple of days now. Still hasnt cleared. Maybe its the purge solenoid too. I just replaced the valve.

Hi,

Did you end up replacing the solenoid as well? On my SRX, the dealer replaced the evap vent and purge valve,then recalibrated the PCM. Cost for labor was $800 and parts $87.95. Just trying to figure out whether that charge was excessive. How long did it take you to do it yourself? Thanks.

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