Flex Plate and Starter Motor Damage

Some 2019-2020 Blazer, Impala and Acadia models equipped with the 2.5L 4-cylinder engine (RPO LCV) and 2019-2020 Equinox and Terrain models equipped with the 2.0L 4-cylinder engine (RPO LTG) may have a condition where the starter spins, but the engine is not cranking over. A grinding sound also may be heard when starting the engine.

 

Flex Plate

Inspect the automatic transmission flex plate (Fig. 7) for any damage or broken ring gear teeth. Replace the flex plate if damage is found. Remove any broken flex plate teeth or metal debris that may be found at the back of the engine assembly and in the transmission bell housing area.

 

Fig. 7

 

When replacing the flex plate, keep in mind that the fasteners have an adhesive patch and must be tightened to final torque within five minutes. Tighten the bolts evenly in sequence. Refer to the Automatic Transmission Flex Plate Replacement procedure in the appropriate Service Information.

 

Starter Motor

Also inspect the starter motor drive pinion teeth for any noticeable damage and determine if the starter assembly can be reused. If the starter pinion drive teeth or housing has only very small imperfections/pitting, reinstall the starter motor. It does not need to be replaced. (Fig. 8)

 

Fig. 8

 

If the starter pinion drive teeth or housing have pieces chunks missing, replace the starter motor assembly. (Fig. 9)

 

Fig. 9

 

– Thanks to David Rutkowski