Skip the auto shop - Our mechanics make house calls

Q: Cant get my car out of limp mode or "fail safe mode"

asked by on

I just bought the car a week ago. Had a check engine light on so got it scanned. Read misfire cyl 3 and random misfire and faulty coil pack. Changed coil pack and spark plugs and wires and ran fine. Next morning on cold start it was sputtering bad and alot of exhaust it was really rich smoke coming out exhaust ran fine after warmed up. Then a day later it went into limp mode and wont come out. I cleaned the maf sensor and the intake throttle bode with intake cleaner spray still stuck in limo mode. Also reset it by unplugging negative terminal for 10 mins still stuck in limo mode. Check engine light code reads random misfire and faulty ect. Nothing major. I dont understand it. I dont know what to do next. Can you help me. Limp mode prevents it from rachimg over 60 mph and not goimg over 3000 rpms.

My car has 145000 miles.
My car has a manual transmission.

A: The reason "limp mode" has become...

The reason "limp mode" has become "unbypassable" is due to the existing codes. The ECT failure, if it exists, may alone account for that because an engine coolant temperature sensor is essentially a master sensor - the value of which must be available and reliable in order for the engine computer to properly control all ignition and fuel outputs. Consequently, based on what you are reporting, an expert would probably first diagnose the code you are getting and continue the diagnostic from there if that sensor checks out OK. If you would like to have this resolved, a certified professional from YourMechanic could diagnose the Check Engine Light and advise on the correct repairs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: AC compressor only engages around 40% of the time

This is likely due to a faulty thermostat sensor which is responsible for controlling the temperature at which the AC compressor comes on. To determine this will require a series of tests. I would recommend having an expert from YourMechanic...

Q: Car in limp mode, check engine light on

In this case you should have an experienced technician look at the vehicle. Limp mode is usually a term used for a vehicle with an automatic transmission which stays in second gear when certain faults arises. A certified technician, like...

Q: Car in storage approx. 6 years. All checked over and ready for road; except engine misses

The Check Engine Light is the first thing to check. If you are getting a misfire code then inspect this cylinder and check the coil and spark to the cylinder. Once this is verified, make sure that the fuel injector...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...