Engine Belt or Water Pump Noise

Some 2016-2019 ATS, CTS, Camaro and 2017-2019 Colorado, Canyon, Acadia, LaCrosse, and XT5 models equipped with the 3.6L V6 engine (RPOs LGX, LGZ) and 2016-2019 CT6 models equipped with the turbocharged 3.0L V6 engine (RPO LGW) or the 3.6L V6 engine (RPO LGX) may have a slight, intermittent squeak noise coming from the front of the engine belt area. The Check Engine MIL may be illuminated and DTC P0324 (Knock Sensor System Performance) may be set in the Engine Control Module (ECM). At times, DTC P0324 may be set by noise from the water pump.

If a sound is heard, listen to the water pump (Fig. 15) with a stethoscope or chassis ears tool for any unusual noise. Compare the noise to a similar vehicle.

Fig. 15

In addition, observe the knock retard bank-to-bank using GDS 2 and then remove the belt and check the knock retard again.

If there is a difference in the knock retard or a noise is heard at the water pump, replace the water pump and reevaluate the condition.

If there are not any noises heard or a different in knock retard, follow the normal diagnostics outlined in the appropriate Service Information.

For additional information, refer to PIP5545B.


– Thanks to Aron Wilson


Updated March 21, 2019

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  1. Additional models and model years have been added to #PIP5545B. The article has been updated.

  2. FunctionOverForm says:

    This is also happening to some LGZ (2017+ Colorado/Canyon 3.6) motors