johnny7
New Member
Hi,
I own a B170SE 5-door Auto CVT, Petrol. It recently started playing up when going uphill, like it's struggling to choose the correct gear and after a few hours of driving will report "Transmission failure - visit workshop" on the dashboard. Over time, it's become progressively worse and now the fault shows up after a few mins of driving and the car goes into a single gear in limp mode.
I've had two mechanics plug it into a computer and assess the fault code to be due to a faulty ECU. Apparently this is a common problem on the A and B class.
I took it back to a mechanic who knows someone who can repair the ECU and, upon inspection, told me the gearbox itself is completely knackered - the oil is like water. He doubts the ECU repair would work and is advising a gearbox rebuild for £2500 + extra if the ECU still shows a fault after that.
I'm slightly confused but not really getting answers to my questions. Can you help?
- Does watery oil really mean the gearbox must be knackered and need a full rebuild?
- Wouldn't a fault code appear on the above if that was the case?
- Why wouldn't they test the ECU first independently of the vehicle and repair that to see if it solves the problem?
I'm not an expert here so looking for some validation of what I'm hearing and also if anyone has experienced this problem or knows what the answers to the above are, or what questions I should be asking.
Any help is appreciated! Thanks.
I own a B170SE 5-door Auto CVT, Petrol. It recently started playing up when going uphill, like it's struggling to choose the correct gear and after a few hours of driving will report "Transmission failure - visit workshop" on the dashboard. Over time, it's become progressively worse and now the fault shows up after a few mins of driving and the car goes into a single gear in limp mode.
I've had two mechanics plug it into a computer and assess the fault code to be due to a faulty ECU. Apparently this is a common problem on the A and B class.
I took it back to a mechanic who knows someone who can repair the ECU and, upon inspection, told me the gearbox itself is completely knackered - the oil is like water. He doubts the ECU repair would work and is advising a gearbox rebuild for £2500 + extra if the ECU still shows a fault after that.
I'm slightly confused but not really getting answers to my questions. Can you help?
- Does watery oil really mean the gearbox must be knackered and need a full rebuild?
- Wouldn't a fault code appear on the above if that was the case?
- Why wouldn't they test the ECU first independently of the vehicle and repair that to see if it solves the problem?
I'm not an expert here so looking for some validation of what I'm hearing and also if anyone has experienced this problem or knows what the answers to the above are, or what questions I should be asking.
Any help is appreciated! Thanks.