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Connect it to a professional grade scan tool computer.
Sometimes the engine failsafe mode is triggered due to a sensor failure or an electrical glitch. It's also common for a security system fault to engage this warning light, which means it's not always a mechanical issue that's causing the failsafe.
Oct 31, 2018
Depends why the Failsafe was triggered. Read the codes would be a good way to start. Anyway, since the car wont start, it may be the crankshaft position sensor, which will cause a trans failsafe and prevent the car from starting.
I would not be surprised if your module or parts you replaced needs to be programmed or put in sync with the transmission computer or engine computer. Check with the dealer. Sometimes they have some silly or eccentric methods to get everything working together again. Cars are not very owner friendly anymore...
Check engine light on , failsafe mode . The first thing to do would be to hook up a scan tool an check for DTC'S - diagnostic trouble code's . Was the vehicle overheating ? Failsafe mode will shut the vehicle off to save the engine if it is over heating . Do you know if the vehicle has electronic throttle control ? Was their a yellow wrench symbol lit on the instrument cluster as well ?
The failsafe mode can appear following numerous faults being detected - some faults can be momentary and register but not cause a problem. These are normally reset by just turning ignition off/on. get the fault code memory read at a garage and this may give you a clue as to a possible problem developing. Failsafe mode will give you reduced engine performance but will allow you to drive for normally some distance. If a serious problem developes your car message centre will tell you to shut off the engine or it will shut it down.
good luck.
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