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What exactly is limphome mode and what diagnostic test needs to be done or scanned???

What would i do if it is in this mode to fix it???

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Toyota highlander 2002 exhaust gets too hot and red after 30 min and light engine get on

bingo its in limphome.
the lamp means (as the operator guide tells)
get it service, hark?
in limphome mode, the Ecu/PCM CAN GO REAL RICH FUEL
This can burn the cat to H3LL
are you DIY, not stated
the FSM says, to Scan IT, GOT A SCAN TOOL?
see those DTCS,
each has more tests, ask. or read ASE books on DTC tests.

no man on earth can guess your DTC errors,not now,not ever.

Jan 19, 2015 | 2002 Toyota Highlander

3 Answers


ok , but no engine stated. which one>??
hot = lying dash gauge or real hand held pyro IR gun? a $20 tool.
did the scan tool ECT reading show too hot, Yes/no.

no new cap, really?
is the cam timed right?
is the spark timed right.?
is the ECU stuck in limphome mode? (huge heat to cylinder walls)
thermostat not upside down.
or thermostat not with bleed hole up hill trapping air below
making it lie and the dash gauge lie too, (the gauge can not measure air, period)

id not do squat with no IR gun. not me. its super accurate too.
and dirt cheap and saves burned hands,
and finds clogged rad tubes saving useless $250 new rad.
one tool. use it. and win.

i this this dang I6 engine, that loves to trap air?
had 3,now, over 500k miles on them. 1988 to present.
and never overheated but once, pin hole in heater core hose
ran bypass and drove home.
i have a 08 wrangler 6sp, 3.8L v6 , nice rig. easy to fix too.

there are 2 parts. (3 really)
engine make too much heat, (limphome or timed wrong)
air in system.
cooling system.

the rad pressure test pass and the green/blue test passes

no water in engine oil
no oil or carbon seen in the engine coolant , all places look.

how hot, ??????
numbers matter, in all ofscience. they talk to you.
at what exact temp did the fans, kick in,?
the FSM shows you this, and how to do that. how to make sure the
fans kick in happen, RIGHT. some are 2 staged with A/C.
not just kick. (when)

Aug 29, 2014 | 1997 Jeep Grand Cherokee

1 Answer

08 suzuki forenza has throttle control but lags a bit put car in gear no throttle control at all

scan it , with a scan tool
it has DTCs,
then get it fixed
or RTM , read the manual, it tells you what to do. why not do that?

on new cars with TBW, throttle by wire, if any of 4 TPS fail to agree
the throttle goes to limphome mode. SCAN it see that?

Aug 17, 2014 | 2008 Suzuki Forenza

1 Answer

Won't go into second gear?

scan it , the TCM may be in limphome mode
and most transmission will skip a gear.
scan it, no scan it twice.
the DTCs tell you what tests are failing.
dont miss any.

Aug 03, 2014 | 2010 Suzuki Alto 1.0

1 Answer

Sx4 /engine revs at 2000-2500engine managment light on and no acceleration

the CEL is not fibbing to you,
its in FAILSAFE mode, Limphome(generic).
get it serviced or
DIY, SCAN IT, and read the FSM for the tests. to do,

FSM = factory service manual sold at all Suzuki stealerships.

Jul 20, 2014 | 2007 Suzuki SX4

1 Answer

Mitsubishi dion poor idle or rpm stops at 4000

tuneup time skipped? the 60k miles tuneup?
scan it? if there are DTC errors, it might in LIMPHOME mode, with RPM limits dropped for good reasons.
or is misfiring. that too can be felt or seen with the scan tool.
the poor idle proves its running bad, no other symptom better prove this. its misfiring, only queston is , why.
50 reasons
or 1 to 10 simple tests to find true cause, ask.
after a full 60k tuneup,(repeats)

Jul 09, 2014 | 2000 Mitsubishi Galant

1 Answer

Suzuki shifts in and out of 3rd

2001 Esteem
A/T tranny.? 4speed?
(check fuses yet?)
this transmission shifts via the TCM electronic brain.
and will throw (store, or live) DTC errors.
IN USA all these cars are OBD2 compliant and all scan tools
work here, you plug it in , and drive and see if there are TRANNY
DTC errors. all cars 1996 and newer, do that. (for sure Suz)

these errors are covered in the FSM and tells you what tests
to do , to isolate (and diagnose) what is wrong.
in and out.
what does that mean.?
to a false neutral? or to 2nd? what?

btw2, the TCM on this car also goes to limphome mode.
when certain DTCs are set. and will skip gears at that moment.
my suz,, both skip 2nd gear in limphome mode.
The TCM needs good inputs or it can't work right.
it has many inputs.
shifter switch PRNDL.
VSS1, VSS2 (veh,speed,sensors)
TPS. (throttle angle.)
ECT. (engine heat)
this trans, 4speed, you can do the unplug test on it (FSM)
and it works like a manual transmission, see the FSM for how to do that, this test proves the trans is ok, and the TCM is cause or its inputs are bad.

Apr 29, 2014 | 2001 Suzuki Esteem

1 Answer

Engine raves cant exceed 3.500, and speed hardly reaches to 110km/h

which engine.?
is the CEL glowing running (check engine lamp)
yes, why are you ignoring it, scan it.
better, scan it any ways, and not all errors glow the CEL.
sounds like its either:
  1. check all fuses
  2. ECU stuck in limphome mode (yes, scan it)
  3. misfire, not doing tune ups. at each 60,000 miles (100km)
  4. bogging starving for fuel (tests) fuel pressure is #1 test.
  5. bad fuel.

yes, scan it, why wait.?

Mar 10, 2014 | 2002 Jeep Grand Cherokee

1 Answer

2004 jeep liberty 42RLE tranmission only has 2nd and reverse yes the engine light is on and no avalablity code reader

no available code reader.?
you need to buy a car that has no PCM.
like 1987 or older xxxxx car...
you can not fix cars without a scanner. not today.
buy one, rent one, barrow one.
it seems your's is in limphome. mode.
get the FSM and read the trans chapter.

the 42RLE is electronicially shifted, the E on the end tells us that.
and has TCM. transmission control module.
The TCM , today is usually hiding deep inside the PCM .
The TCM can not shift (just like all computers) if the inputs are wrong
or the TCM discovers gross transmission slip.

if the Tranny slips. the out put shaft sensor never reaches.
the correct RPM (speed) and the TCM drops to limphome.
Limphome is a mode that allows some usage,
after all , its dead. the system that is.
as always, elect.
check all fuses (test them) ( tells you which ones) or the FSM.
then check level using the correct procedure, do not guess.
if you guess and overfill the tranny , you risk foam up and bearing starvation and (destruction)
THE FSM the factor service manuals on all cars have this chapter
called how to fix the tranny in car, or on car tranny service.
we read that and see many simple tests. we do them.
the first checks are SCAN TOOL.
then stall test.
then pump pressure tests.

we do that tests and gather all evidence we can , and then
do tests, totally based on those facts and the facts stated in the FSM
related directly to the DTC errors you are blind to.

there is no way to cheat this process. other that, get the car serviced.

Feb 01, 2014 | Jeep Liberty Cars & Trucks

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