Went into Limp mode 2 times

[Hogward]

Glad they could fix the limp problem without viagra!!

[aj510]

sorry to bump an old thread, however i'm experiencing the same problems atm.

I have delayed start, car goes into limp every now and then and the dealer is totally useless. I think they'd need a map to wipe their ass.

I'm getting low circuit error codes (P0642). This seems to be a low voltage indicator, did anyone else who had their throttle module replaced have this error code??

[rjkusse]

Mine went into limp mode (I believe) once the other day and then this morning it's bad. Car sitting over night, started fine, drove down the street, would not shift and would not go above 3000RPM. Shut it off, started it again, no problem. Drove down the road, came to a stop, back to not shifting. Shut it off, started it up, not fixed this time. Drove home at 35MPH. Temperature this morning, 45F and raining.

[Rambit]

Originally Posted by rjkusse

Mine went into limp mode (I believe) once the other day and then this morning it's bad. Car sitting over night, started fine, drove down the street, would not shift and would not go above 3000RPM. Shut it off, started it again, no problem. Drove down the road, came to a stop, back to not shifting. Shut it off, started it up, not fixed this time. Drove home at 35MPH. Temperature this morning, 45F and raining.

From the service manual...

EMERGENCY RUNNING FUNCTION - LIMP MODE

In order to ensure a safe driving state and to prevent damage to the automatic transmission, the TCM control module switches to limp-home mode in the event of critical faults. A diagnostic trouble code (DTC) assigned to the fault is stored in memory. All solenoid and regulating valves are thus de-energized.

The net effect is:

- The last engaged gear remains engaged.
- The modulating pressure and shift pressures rise to the maximum levels.
- The torque converter lockup clutch is deactivated.

In order to preserve the operability of the vehicle to some extent, the hydraulic control can be used to engage 2nd gear or reverse using the following procedure:

• Stop the vehicle.
• Move selector lever to "P".
• Switch off engine.
• Wait at least 10 seconds.
• Start engine.
• Move selector lever to D: 2nd gear.
• Move selector lever to R: Reverse gear.

The limp-home function remains active until the DTC is rectified or the stored DTC is erased with the appropriate scan tool. Sporadic faults can be reset via ignition OFF/ON.
-----------------------

In other words, it's important to know what code(s) you have and to have the DTC's repaired that are the cause of the limp mode.

You can check if you have DTC's by putting your key in the ignition and turning ACC-ON-ACC-ON-ACC-ON in quick succession. The codes will show in your EVIC.

Bernie

[UK CHRYSLER 300C]

2nd gear all the way home ay? oh what fun,thats 80 mph,that'll do.lol.but seriously have you tried pulling fuse 14,I pull that one everytime i pull fuse 11(pre predator)

[Rambit]

They say the most common cause of going into limp mode is over revving and the next is low ATF.

Bernie

[stevesrt8]

newer owners...

Don't forget that many car's strange electrical gremlins are magically cured by carefully removing and replacing all the fuses and relays in the two separate boxes.

It's too easy not to try!

[aj510]

I wish taht solved my problem. Tried that and made no difference. My car is currently at the dealer (5 days so far) and they still have NO IDEA as to what is going on. I'm pretty pissed off and thinking of trading the 300 for something that will run like a new car should

Originally Posted by stevesrt8

newer owners...

Don't forget that many car's strange electrical gremlins are magically cured by carefully removing and replacing all the fuses and relays in the two separate boxes.

It's too easy not to try!

[SilverSurfer300]

What exaclty is limp mode? Ive hear this a few times but dont know exactly what it is.

[Rambit]

Originally Posted by SilverSurfer300

What exaclty is limp mode? Ive hear this a few times but dont know exactly what it is.

It's when the ECU detects that something semi-serious is wrong, it enters the limp mode, which means that the engine won't rev beyond a pre-programmed speed, you can't accelerate very fast, or you may be speed restricted. It reverts back to a pre-programmed "guessing map" for timing, fuel delivery, etc. when a critical sensor fails. It's not necessarily a bad thing because the alternative would be to either let you drive at regular speeds, with the danger of letting you cause major damage to your car.

Bernie