ML550 abrupt hesitation at low speeds when use WOT
Thread Starter
Newbie
Joined: Apr 2015
Posts: 3
Likes: 0
2002 E55, 2012 ML550, 2006 Z4
ML550 abrupt hesitation at low speeds when use WOT
From both standing start or slow rolling start up to 20 mph if I push gas pedal to the floor I get brief acceleration then immediate loss of power. Tach rpms drop off to idle range and my body snaps forward into seatbelt restraint. I can replicate this at least 50% of the time.
I get no “ESP/traction” warning indicators when the issue occurs.
Independent MB repair shop last week:
1. Found 9 error msgs with same error “ ignition communication error”
2. Cleared all the error msgs
3. Told me to replicate the issue a couple of times and bring the ML550 back for scheduled service and he will read error msg log to see if any error msgs have been logged
On Saturday, I replicated the issue four times on dry pavement. On two occasions I removed the KeyLessGo and used my key fob to turn on the ignition manually. Same issue.
On March 15th I have service appointment scheduled for diagnosing the cause.
Any diagnosis suggestions?
MBWorld Fanatic!
Joined: May 2017
Posts: 1,234
Likes: 155
From: Montreal/Cape Coral FL
2012 X6 35i Sport, 2013 ML 350 BT, 2019 4Runner TRD Pro, 2020 CRV-AWD
From both standing start or slow rolling start up to 20 mph if I push gas pedal to the floor I get brief acceleration then immediate loss of power. Tach rpms drop off to idle range and my body snaps forward into seatbelt restraint. I can replicate this at least 50% of the time.
I get no “ESP/traction” warning indicators when the issue occurs.
Independent MB repair shop last week:
1. Found 9 error msgs with same error “ ignition communication error”
2. Cleared all the error msgs
3. Told me to replicate the issue a couple of times and bring the ML550 back for scheduled service and he will read error msg log to see if any error msgs have been logged
On Saturday, I replicated the issue four times on dry pavement. On two occasions I removed the KeyLessGo and used my key fob to turn on the ignition manually. Same issue.
On March 15th I have service appointment scheduled for diagnosing the cause.
Any diagnosis suggestions?
Thread Starter
Newbie
Joined: Apr 2015
Posts: 3
Likes: 0
2002 E55, 2012 ML550, 2006 Z4
problem fixed
repair shop determined the torque converter lockup solenoid was faulty. repair shop replaced it. $150 part. the tranny fluid needed to refill the transmission was more expensive
total cost $600
not only is the power failure issue solved . the ML550 launches from standing stop better than it ever has since I bought it 3 months ago
repair shop determined the torque converter lockup solenoid was faulty. repair shop replaced it. $150 part. the tranny fluid needed to refill the transmission was more expensive
total cost $600
not only is the power failure issue solved . the ML550 launches from standing stop better than it ever has since I bought it 3 months ago
MBWorld Fanatic!
Joined: May 2017
Posts: 1,234
Likes: 155
From: Montreal/Cape Coral FL
2012 X6 35i Sport, 2013 ML 350 BT, 2019 4Runner TRD Pro, 2020 CRV-AWD
Awesome! Nice to read that it is possible to repair these vehicles without the need to sell a kidney to pay for it
