Starter Buick Cadillac Pontiac 12587429 89017760: Complete Guide

Author : Danny walker | Published On : 11 Aug 2026

A single click, slow cranking, or a complete no-start are the telltale signs of a failing starter — the small motor that engages your flywheel and turns the crankshaft to get combustion going. On GM Northstar V8 vehicles, this is one of the most common causes of a no-start.

This Delco PMGR starter (OEM 12587429 / 89017760, cross-referenced to AC Delco 323-1633 and Delco 8000012) fits: Buick Lucerne 4.6L (2006–2010), Cadillac DeVille 4.6L (2005, 2nd production build), Cadillac DTS 4.6L (2006–2010), Cadillac SRX 4.6L (2005 2nd production, 2006–2009), Cadillac STS 4.4L/4.6L (2006–2009/2010), Cadillac XLR 4.4L/4.6L (2006–2009), and Pontiac Bonneville 4.6L (2005, 2nd production build). Note: 2005 models need the later "2nd production" build — verify your VIN before ordering.

Specs: 12V, clockwise rotation, 9 teeth, 1.7kW, ~10 lbs. Quality matters here — a cheap starter risks premature failure and flywheel damage, while a properly matched unit delivers reliable, consistent cranking.

Installation is a moderate DIY job: disconnect the battery, compare old and new units, and torque bolts to spec. Confirm your OEM number and get a verified replacement from Denparts.ca today.