What does P1599 mean on a Chevy?

P1599. Engine Stall Or Near Stall Detected. Applies to Silverado, Sierra, Tahoe, TrailBlazer, Impala.

What causes P1599 on a Chevy?

Carbon-fouled throttle body causing idle droop and stalling on deceleration Failing crankshaft position sensor dropping signal at low RPM Weak fuel pump losing pressure under load on high-mileage trucks Large vacuum leak leaning the idle mixture past the IAC correction limit

How do I fix P1599 on a Chevy?

Check fuel pressure under load and capture stall freeze-frame data with a Tech2/GDS2 scan tool Clean the throttle body and perform an idle relearn before replacing sensors Scope the crankshaft position sensor signal for dropouts at hot idle Smoke-test the intake manifold and brake booster hose for vacuum leaks

Code

P1599

Engine Stall Or Near Stall Detected

Category: Powertrain - Computer and Auxiliary Controls
Severity: Check Engine Light
Applies to: Silverado, Sierra, Tahoe, TrailBlazer, Impala
Related: P0300 Random/Multiple Cylinder Misfire Detected on OBD Codes List

What it means

P1599. Engine Stall Or Near Stall Detected. This Chevy-enhanced code applies to Silverado, Sierra, Tahoe, TrailBlazer, Impala.

Findings, check these first

Carbon-fouled throttle body causing idle droop and stalling on deceleration
Failing crankshaft position sensor dropping signal at low RPM
Weak fuel pump losing pressure under load on high-mileage trucks
Large vacuum leak leaning the idle mixture past the IAC correction limit

Standard procedure

Check fuel pressure under load and capture stall freeze-frame data with a Tech2/GDS2 scan tool
Clean the throttle body and perform an idle relearn before replacing sensors
Scope the crankshaft position sensor signal for dropouts at hot idle
Smoke-test the intake manifold and brake booster hose for vacuum leaks

Look up another code

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Sources and review

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Last updated 2026-09-13.

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