Originally Posted by
onehundred80
Limp mode is used in context with the automatic transmission.
In limp mode the car uses only 2nd gear in the auto box and is not a condition seen on a manual transmission.
On the manual tranny cars and the auto tranny cars poor performance is caused by one of many possible faults. Get any fault codes read using an OBDII scanner.
I doubt that it is caused by the ECU if it is a true Limp Mode condition.
You should have come here first, get the ECU back and look for the real problem.
Thanks for your quick response 180. Regrettably your right I should have come on here first. The background is the BAS/ESP light started to come on intermittently, car is manual transmission. Then one day it stayed on and car went into a what I described as Limp mode(car low revs, moved at a crawl. Before I got someone to look at it the battery went completely dead, when charged the car cranked on IGNITION ON which it still does strangely. I changed the battery as it was old. The Car went to former Chrysler dealer where it was bought. They told me there was a ball of fault codes coming up and they had to decipher what the real ones where. They changed ignition switch, pulse module, sent brain away to test circuits it came back fine. They only checked the circuit didn't plug it into computer. 2 months later got it back, not fixed. Had it with a Mercedes technician, he 'said' he tried changing throttle body, no difference although I reckon he didn't spend too much time on it. Took to NITEC Coleraine a Mercedes 'specialist'. They told me there was no CAN communication to the throttle body and advised sending it to BBA-Reman. They would not work on this ECU and AC tronics only work with trade. This left me googling and I spoke to AUTOTEK. Guy sounded decent and informative so desperate at this stage I sent it away only to see dreadful reviews later. Ahhhhhhhh sigh! I will probably just pay them the £84 diagnostic charge but I'll still be back to square one.