Experiencing engine trouble with your 2001 Saturn S-Series can be frustrating, especially when you’re faced with cryptic OBD2 codes. If you’ve encountered the P1599 code on your Saturn, you’re likely dealing with an Engine Stall or CC Power Management Mode issue. This article delves into the specifics of the P1599 code for your 2001 Saturn, helping you understand the potential causes and guide you through troubleshooting steps to get your vehicle back on the road.
The P1599 code, as indicated by your OBD2 scanner, points towards a condition where the Powertrain Control Module (PCM) detects an engine stall or near stall situation while the ignition is still active. In simpler terms, your car’s computer recognizes that the engine has stopped running unexpectedly, even though it’s still trying to keep it going.
This issue was brought to light by a Saturn owner in Dillingham, AK, a location with limited access to specialized mechanics. They reported a 2001 Saturn S-Series with a 1.9L engine and manual transmission exhibiting symptoms of sudden engine stall after initially running well. The vehicle would sometimes start, rev high, and then abruptly die, regardless of throttle input.
Initial diagnostic efforts using a Snap-On scanner revealed a cluster of codes including:
- P0300 Misfire: Indicates random or multiple misfires detected.
- P0341 CMP Sensor Circuit out of Range: Originally suspected to be a Camshaft Position Sensor issue, but later clarified to be related to the Crankshaft Position Sensor on this model.
- P0507 Idle Control System (RPM too High): Signals an issue with the idle control system causing excessively high RPM.
- P0562 System Voltage Low: Indicates a low voltage condition in the vehicle’s electrical system.
- P1599 CC Power Management Mode or Engine Stall: The primary code of focus, highlighting the engine stall condition.
A typical Snap-On scanner used for diagnosing OBD2 codes.
Following the initial diagnosis, the Saturn owner replaced the Crankshaft Position Sensor (CKP), as advised by parts specialists who clarified that the “CMP” in the code description referred to the CKP sensor for this vehicle. However, clearing the codes and replacing the CKP sensor did not resolve the problem. The engine continued to exhibit the same symptoms, and the P1599 code persisted along with others.
Understanding the P1599 Code in Detail
The scanner’s code tips for P1599 are crucial in guiding the diagnostic process. They state:
- P1599 sets when PCM detects engine stall or near stall condition with ignition still activated. This reinforces the fundamental issue – the engine is stopping unexpectedly.
- If other DTCs are set with 1599, repair other DTCs first. This is a critical piece of advice. Codes like P0300, P0341, P0507, and P0562 might be contributing to or causing the P1599 code. Addressing these underlying issues is paramount.
- P1599 does not light the warning light. This means you might only be aware of the problem through symptoms and a scanner, not a dashboard warning light.
- P1599 can be set during operation with manual transmission vehicles. This is relevant to the Saturn owner’s situation.
- 1599 sets when key is on and no CKP signal detected by PCM (engine stalled). This points back to the CKP sensor, but since it was already replaced, other factors might be at play.
- 1599 may also set by intermittent fuel pump failure, sticking open EGR, or intermittent ignition failure. This expands the potential culprits beyond just the CKP sensor.
Engine stalling can be a complex issue with various potential causes.
Potential Causes and Troubleshooting for P1599 on a 2001 Saturn
Based on the code description and the accompanying codes, here’s a breakdown of potential causes and troubleshooting steps for your 2001 Saturn S-Series:
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Address Other DTCs First: As the code tip suggests, focus on resolving the other diagnostic trouble codes (DTCs) present.
- P0300 (Misfire): Investigate ignition system components like spark plugs, spark plug wires, ignition coil(s). Also, check for fuel delivery issues (injectors) and vacuum leaks.
- P0341 (CMP Sensor Circuit out of Range – Crankshaft Sensor related): Even though the CKP sensor was replaced, re-examine the wiring and connections to the sensor. Ensure the sensor is properly installed and functioning. A faulty new part is also a possibility, although less likely.
- P0507 (Idle Control System – RPM too High): Inspect the Idle Air Control (IAC) valve or system for proper operation. Check for vacuum leaks that could cause high idle.
- P0562 (System Voltage Low): Diagnose the charging system. Check the battery voltage, alternator output, and wiring connections. A low voltage condition can cause a multitude of sensor and system malfunctions.
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Fuel System Issues: The code tip specifically mentions intermittent fuel pump failure.
- Fuel Pump Check: While the owner hears the fuel pump running, this doesn’t guarantee adequate fuel pressure or consistent delivery. A fuel pressure test is crucial to verify the fuel pump’s performance. Low fuel pressure can lead to engine stall, especially under load or when demanding more fuel.
- Fuel Filter: A clogged fuel filter can restrict fuel flow and cause similar symptoms to a failing fuel pump. Consider replacing the fuel filter.
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EGR Valve Problems: A sticking open Exhaust Gas Recirculation (EGR) valve can disrupt the air-fuel mixture and cause engine stall, particularly at idle or low speeds.
- EGR Valve Inspection: Check the EGR valve for carbon buildup or sticking. Try manually actuating the valve to see if it moves freely.
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Ignition System Faults: Intermittent ignition failures can lead to misfires and engine stall.
- Detailed Ignition System Check: Beyond spark plugs and wires (already mentioned for P0300), inspect the ignition coil pack(s) and the ignition control module for any signs of malfunction.
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Vacuum Leaks: Unmetered air entering the engine through vacuum leaks can cause a variety of issues, including high idle (P0507) and engine stall.
- Vacuum Leak Test: Thoroughly inspect all vacuum lines, intake manifold gaskets, and hoses for leaks. A smoke test can be helpful in locating elusive vacuum leaks.
Checking for vacuum leaks is a critical step in diagnosing engine issues.
Conclusion: Systematic Diagnosis is Key
Dealing with a P1599 code on your 2001 Saturn requires a systematic approach. Don’t solely focus on the P1599 code itself. Prioritize addressing the other DTCs present, as they are likely contributing to the engine stall issue. Thoroughly investigate the fuel system, EGR valve, ignition system, and for vacuum leaks.
Given the remote location and lack of specialized Saturn mechanics mentioned in the original scenario, methodical troubleshooting and access to reliable diagnostic information are even more critical. By following these steps and carefully evaluating each potential cause, you can increase your chances of pinpointing the root of the P1599 code and getting your 2001 Saturn S-Series running smoothly again. If the problem persists, seeking assistance from a qualified mechanic with broader diagnostic capabilities might be necessary.
