What does code P1599 mean?

Q: What does code P1599 mean?

Engine Stall Detected. P1599 on GM vehicles means the powertrain control module has detected an actual engine stall event, where the engine stopped rotating unexpectedly while the vehicle was in operation. The module logs this code when it sees the engine speed drop to zero without a commanded shutdown, often alongside a loss of crankshaft or camshaft signal. This is a stored history code that points to the stall itself rather than naming the root cause, so diagnosis must focus on why the engine quit.

DTC codes / GM codes / P1599

P1599 · GMEngine Stall Detected

P1599 on GM vehicles means the powertrain control module has detected an actual engine stall event, where the engine stopped rotating unexpectedly while the vehicle was in operation. The module logs this code when it sees the engine speed drop to zero without a commanded shutdown, often alongside a loss of crankshaft or camshaft signal. This is a stored history code that points to the stall itself rather than naming the root cause, so diagnosis must focus on why the engine quit.

SystemPowertrain

Code typeGM specific

SeverityMedium

Fix difficultyProfessional

AreaVehicle speed, idle control and auxiliary inputs

Guidance is general and written for GM vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.