2010 Cadillac Truck SRX AWD V6-3.0L Technical Service Bulletin # 07-06-04-025H Date: 120727

2010 Cadillac Truck SRX AWD V6-3.0L Technical Service Bulletin # 07-06-04-025H Date: 120727

Fuel System - Clicking/Ticking Noises On Cold Start Up

INFORMATION

Bulletin No.: 07-06-04-025H

Date: July 27, 2012

Subject: Information on Clicking/Ticking Sound/Noise Heard During Cold Start

Models:

2009-2013 Buick Enclave

2010-2013 Buick LaCrosse

2008-2011 Cadillac STS

2008-2013 Cadillac CTS

2010-2013 Cadillac SRX

2013 Cadillac ATS, XTS

2009-2013 Chevrolet Traverse

2010-2013 Chevrolet Camaro, Equinox

2012-2013 Chevrolet Impala

2009-2013 GMC Acadia

2010-2013 GMC Terrain

2009-2010 Saturn OUTLOOK

Equipped with 3.0L or 3.6L VVT Direct Injection V6 Engine (VINs G, D, 5, V, Y, 3 - RPOs LF1, LFW, LLT, LFX)

Supercede:

This bulletin is being revised to add the 2013 model year and the Cadillac ATS, XTS models. Please discard Corporate Bulletin Number

07-06-04-025G (Section 06 - Engine/Propulsion System).

The 3.0L and 3.6L SIDI engines use a direct injection fuel system that operates at very high fuel pressures. A direct injection fuel system produces

a rapid clicking and ticking sound that can be heard from the engine compartment. The sound is more evident when outside around the vehicle or

when the hood is open. The sound is more noticeable during idle and is more frequent during a cold start, but lessens once the engine is warm.

The rapid ticking noise on cold start up is the fuel pump (located on the rear of the left cylinder head) building up high fuel pressure. When the

engine warm-up is completed, the high pressure fuel pump will continue to tick at a lower rate of approximately one tick per second during idle.

The clicking sound is the fuel injectors pulsing on and off under higher fuel pressures. This sound is a normal characteristic of Direct Injection Fuel

high pressure fuel system.

DO NOT attempt to repair or replace any parts for this kind of clicking or ticking concern. The clicking or ticking sound is not indicative of any

concerns with the engine or the vehicle. You may wish to give the customer a copy of this bulletin.