I have a 2001 e320 with 103000 miles

ESP lighted up, engine running but unable to accelerate. Display Visit Workshop, the code is P0120.
It starts fine but runs at 1200 rpm and after pressing the accelerator goes to a maximum of 1600 rpm while parked.
When I drive it will go up to 12 miles per hour with the pedal to the floor.

Please any help would be appreciated

__________________
2008 ML320 CDI
2007 GL320 CDI
2005 Audi A6 (sold)
2001 E320 (sold)
2004 lexus RX330 (sold)
2004 Honda CRV (sold)
93 190E 2.6 (sold)
97 E320 (sold)
2000 Honda CRV (sold)
91 350SD (sold)
90 E300 with amg body kit (sold)
83 300sd aqua marine (sold)
81 300sd dark blue (sold)
81 300sd gold (sold)
81 300sd brown (sold)

The code is related to the accelelerator potiemtiometer that controls the accelerator.

The accelerator cable connects to that potientiometer.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

I was reading allot about the code and it points to the throttle position sensor at the and of accelerator cable in the area of brake booster.

I am curious if I replace the sensor if this should fix my problem?

Thank you

__________________
2008 ML320 CDI
2007 GL320 CDI
2005 Audi A6 (sold)
2001 E320 (sold)
2004 lexus RX330 (sold)
2004 Honda CRV (sold)
93 190E 2.6 (sold)
97 E320 (sold)
2000 Honda CRV (sold)
91 350SD (sold)
90 E300 with amg body kit (sold)
83 300sd aqua marine (sold)
81 300sd dark blue (sold)
81 300sd gold (sold)
81 300sd brown (sold)

I would say yes. Mine on my SLK gave the same code and pretty much the same problem. One thing you can try. Sit in the car and push the gas pedal all the way down. Then turn the key on but dont start it. Hold the pedal for a 60 count then turn the key off. wait a few then try and start it.

That should reset the PPS

Hi

I tried the reset but did not work

I am not sure if I did the reset the right way

I put key on to position # II, depressed gas pedal including the kick down switch and held it for 2 minutes, than turned off the key without removing it, waited 3 minutes and restarted the car. Went for a drive but the accelerator does not goes to max 1700 rpm and speed max 15 miles per hr

__________________
2008 ML320 CDI
2007 GL320 CDI
2005 Audi A6 (sold)
2001 E320 (sold)
2004 lexus RX330 (sold)
2004 Honda CRV (sold)
93 190E 2.6 (sold)
97 E320 (sold)
2000 Honda CRV (sold)
91 350SD (sold)
90 E300 with amg body kit (sold)
83 300sd aqua marine (sold)
81 300sd dark blue (sold)
81 300sd gold (sold)
81 300sd brown (sold)

I did some testing

I unplugged the plug from the TPS, than put key in position #II and measured the voltage in the plug coming from ECU to the TPS between pin 1 & 6 = 4.97v
and than between pin 1 & 3 =4.97v.

Later on the bench I supplied 5v (using a power adapter with 5V voltage regulator) to the TPS pin 1+ and pin 3- and measured the voltage between pin 3 & 4 = 0.140v.

Than 5v to pin 1+ and pin 6-and measured voltage between pin 5 and 6= 0.311v

Does this sound like my TPS is working normal and I have some other issues with my car not having response to the gas pedal?

Thank you

__________________
2008 ML320 CDI
2007 GL320 CDI
2005 Audi A6 (sold)
2001 E320 (sold)
2004 lexus RX330 (sold)
2004 Honda CRV (sold)
93 190E 2.6 (sold)
97 E320 (sold)
2000 Honda CRV (sold)
91 350SD (sold)
90 E300 with amg body kit (sold)
83 300sd aqua marine (sold)
81 300sd dark blue (sold)
81 300sd gold (sold)
81 300sd brown (sold)

I've not heard of that reset before, but do note that you did not do it as was instructed.

1) Insert key (pos 0), depress pedal to floor and hold.
2) Then turn key to pos 2 and continue holding pedal for 60 secs.
3) Then turn key off and release pedal.
Engine should never have started as key never went past pos 2.

__________________
Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)