Engine Safety Shutdown
Indicates a safety shutdown condition in the engine system.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The engine control module has detected a critical issue that requires immediate shutdown to prevent damage to the engine.
What the computer is actually seeing
The engine control module sees a fault that corresponds to unsafe operating conditions, often taking input from various sensors regarding temperature, pressure, or electrical faults.
What a healthy reading looks like
Expected values vary by system but often include temperature ranges between 180°F and 210°F for coolant, normal oil pressure between 20 PSI and 60 PSI, and voltages around 12.5V to 14.5V on battery circuits.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the engine oil level and condition. Ensure it's at the correct level and does not appear contaminated.
- 22. Inspect for coolant leaks. Look for any signs of leaks around hoses and the radiator.
- 33. Verify the integrity of all engine wiring and connectors for signs of damage or corrosion.
- 44. Check engine temperature with an infrared thermometer; it should be between 180°F and 210°F.
- 55. Measure oil pressure using a mechanical gauge; it should read between 20 PSI and 60 PSI.
- 66. Use a multimeter to check battery voltage; it should be between 12.5V and 14.5V while the engine is running.
- 77. If all checks are normal, confirm the sensors are functioning correctly with a scan tool and check for any active faults. If faults persist, consider replacing the suspect sensor or component.
Common causes
- Overheating engine condition
- Low oil pressure
- Electrical fault or short in wiring
- Faulty sensors or malfunctioning engine components
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with SPN 144 active?
No, it's not safe to drive. The vehicle is likely in a limp mode or may shut down unexpectedly to prevent damage.
Will this code come back after I clear it?
If the issue causing the shutdown is not resolved, it will likely return.
Why does this code pair with SPN 156?
SPN 156 relates to the coolant temperature sensor, which is often monitored during shutdowns for safety reasons.
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