Where is the IAC valve located?

2019 CHEVROLET SILVERADO
50,000 MILES • 5.3L • V8 • 2WD • AUTOMATIC
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ARMINRODRIGUEZ
RPM at idle are always at 0 and I can feel the engine struggling sometimes. No warning lights or anything and it has been like that since I bought it.
New transmission at 35,000 miles and lifter problems so i rebuilt the engine at 48,000. But the RPMs still the same not a 100 or 200, needle is at 0 when idle.
Jun 4, 2025 at 9:45 AM
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STEVE W.
  • ✓ASE Certified Mechanic
  • 15,171 POSTS
  • ASE Certified Mechanic
If the engine is running but the dash reads zero, does it do anything when you rev it? The problem sounds like a failed stepper drive for the tachometer, or it has an ignition issue, so the tachometer signal is wrong. I would go over the wiring and in particular the ground strap that runs from the back of the engine to the frame. They like to fail and you get a lot of strange things when that happens.
Jun 4, 2025 at 9:58 AM
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