Answer
Aug 24, 2025 - 05:54 AM
If your 2007 Cadillac CTS starts but stalls when you put it in gear, there are a few common culprits that could be causing this behavior:
- Torque Converter Clutch (TCC) stuck on — This is the #1 suspect. If it’s locking up too early, the engine’ll stall just like a manual car would if you forgot to press the clutch. Could be a faulty TCC solenoid or a valve body issue.
- Idle Air Control problems or dirty throttle body — Sometimes it’s just not getting enough air when the load hits. Dirt or gunk on the throttle plate can throw things off, especially at idle.
- Vacuum leak somewhere — Cracked hoses or leaky intake gaskets can mess with your idle, and as soon as you throw it in gear, it drops too low and stalls.
- Bad mass airflow sensor — These things can cause all kinds of weird behavior if they’re sending junk data to the ECU. Engine might start but conk out under load.
If you're the DIY type, the manual covers this stuff in detail — step-by-step guides, wiring diagrams, troubleshooting flowcharts — all the good stuff. It'll show you how to test solenoids, sensors, and idle circuits with a multimeter, not just guess at what’s wrong.
Good luck!
