Quick answer: Replace Starter Motor on a 2013–2019 Cadillac ATS is rated Advanced and takes about 2-3 hours. You'll need 8 tools for this job, and parts cost about $200. This guide walks you through the full job step by step, including the mistakes to avoid.
| Part Name |
Part Number |
Price |
Buy |
| Starter Motor |
ACDelco 336-1023 |
$200.00 |
|
About prices: shown prices are typical retail averages and change frequently; cheaper alternatives may be available. Confirm the current price before buying.
💡 Pro tip: Order all parts at once to save on shipping
Step-by-Step Instructions
Follow these steps carefully
1
Disconnect the battery and raise the vehicle if needed
Always disconnect the negative battery cable first. On the Cadillac ATS, the starter is typically on the bellhousing — access may be from above or below. If you must raise the vehicle, use a floor jack on a solid lift point and support with jack stands on level ground. Wear eye protection.
🔧 Mechanic's note — Tom Becker
I disconnect the negative cable before going near the starter — the B+ cable is always hot, and I've seen what happens when a wrench finds ground.
2
Locate the starter and disconnect wiring
Identify the B+ battery cable and the solenoid trigger wire/connector on the starter. Remove the nut and cable, then unplug the trigger connector. Cap or tape the battery cable end so it cannot short to ground.
🔧 Mechanic's note — Ray Delgado
I cap the battery cable end the moment it comes off — I've seen an uncapped B+ cable swing into ground, and the fireworks are not worth it.
3
Support the starter and remove mounting bolts
Support the starter body, then remove the mounting bolts (often 13–15 mm). Lower or lift the starter out clear of the bellhousing. Note any heat shield, bracket, or alignment dowel that must transfer to the new unit.
4
Compare the new starter
Compare nose length, clocking of the solenoid, mounting ears, and pinion gear to the old starter. Transfer any brackets or heat shields. Confirm the drive gear turns freely by hand.
5
Install the new starter and reconnect cables
Maneuver the new starter into place, start the mounting bolts by hand, then tighten evenly to spec. Reconnect the solenoid trigger connector and the B+ cable; tighten the cable nut firmly without stretching the terminal.
6
Reconnect the battery and test cranking
Reconnect the negative battery cable. Verify the Cadillac ATS cranks strongly without grinding or slow-spin symptoms. Confirm no chafed wiring and that any underbody shields are reinstalled before a final road check.
🔧 Mechanic's note — Tom Becker
I verify it cranks strongly and check for chafed wiring — I've had a fresh starter grind from a loose connection, and the retest takes thirty seconds.
All Done!
Test your repair before closing everything up. If something doesn't work right, double-check your steps.
⚠️ Common Mistakes to Avoid
- • Not disconnecting the battery before starting the repair
- • Forgetting to replace gaskets leading to leaks
- • Over-tightening bolts causing damage to components
- • Neglecting to properly torque bolts to manufacturer specifications
- • Failing to properly route wiring harnesses during reassembly
