DTS V8-4.6L VIN Y (2006)
Canister Vent Valve: Recalls
Emissions - Knocking Noise Repeating 3 Times
Bulletin No.: 06-06-04-062A
Date: February 14, 2008
TECHNICAL
Subject:
Knocking Noise That Repeats Three Times on Cold Start (Replace EVAP Canister Vent Solenoid Valve)
Models:
2006 Cadillac DTS
Supercede:
This bulletin is being revised to update the information and change the part number for the EVAP Canister Vent Solenoid Valve. Please discard
Corporate Bulletin Number 06-06-04-062 (Section 06 - Engine/Propulsion System).
The noise emitted from the evaporative emissions vent solenoid is not indicative of any condition with the solenoid or the customer's vehicle. Please
inform your customer that the sound heard is the result of the valve cycling during a required emissions test. If the knowledge that the vehicle is
operating properly relieves the customer concern, DO NOT replace the EVAP solenoid. If the customer expresses that the noise is offensive, replace the
EVAP solenoid with a newly available and quieter operating solenoid using the procedure in this bulletin.
Condition
Some customers may comment on a knocking noise heard from the rear area of the vehicle. The knocking noise occurs three times after a cold start up
and usually while driving the vehicle under 16 km/h (10 mph).
Cause
The EVAP emission system performs a series of tests upon cold start up to ensure that the EVAP system is operating normally. The EVAP canister vent
solenoid valve will purge and cycle the solenoid causing a noise that might be heard inside the vehicle and perceived as a knocking noise.
Correction
Replace the EVAP canister vent solenoid valve with a quieter updated EVAP canister vent solenoid. Refer to Evaporative Emission Canister Vent
Solenoid Valve Replacement in SI.
Parts Information
Warranty Information
For vehicles repaired under warranty use, the table.