Hi everyone,
I was the happy owner of a 2003 307 1.6l 123000km petrol until the transmission AL4 starts to have issues. I've read a lot of threads here about the AL4, but none with my pattern of defect...
I'll try to make it short:
- one evening, the 1st gear didn't engage in traffic jam, and after rev high, engaged with a loud bang and a big kick as if another car smashed into the rear. I've done few km like that until I found a place to park. The car was checked the day after by a transmission specialist who couldn't reproduce the defect and found only a pcode p0501 about vehicle speed sensor defect.
- After test driving the car a while, I managed to reproduce the defect: it happened only after driving more than 10 min on the highway (>100 km/h). Even with the transmission in defect, the only pcode was still p0501.
- The mechanics replaced the sensor with a new one. Things were better...
- ...but the transmission now goes into limp mode after driving more than 1 hour on the highway... I can drive 2 hours in city, it's fine. I drive more than 1 hour on the highway, I'm pretty sure to have the limp mode (shifting gear at 4000 rpm and no shifting to 4th gear, no manual mode). And still the only pcode is p0501...
- Interestingly, I don't have the "s" and "*" on the dashboard or any message about a transmission defect. If I wait at least 10 min with the engine off, the transmission is good for quite a few time - just turning off/on change nothing, i really have to wait at least 10 min.
-More interestingly, if I push the "*" button to go into snow mode, the transmission is fine (for a snow mode): shifts a low rpm, shift to 4th gear... If i remove the snow mode, the transmission is faulty again, and the sport mode is also faulty.
My mechanics told me I have to change solenoids... but as the transmission isn't faulty at all with snow mode, I think solenoids are good, right ? I would rather think that the ECU is faulty.
What do you think ? Does any of you have any clue or check I could do to be sure what is wrong ?
Thanks for reading and for your answers ! I currently need the car to go from Morayfield to Gold Coast (120 kms) everyday...
Khman
PS: English is not my native language, so I apologize in advance.
I was the happy owner of a 2003 307 1.6l 123000km petrol until the transmission AL4 starts to have issues. I've read a lot of threads here about the AL4, but none with my pattern of defect...
I'll try to make it short:
- one evening, the 1st gear didn't engage in traffic jam, and after rev high, engaged with a loud bang and a big kick as if another car smashed into the rear. I've done few km like that until I found a place to park. The car was checked the day after by a transmission specialist who couldn't reproduce the defect and found only a pcode p0501 about vehicle speed sensor defect.
- After test driving the car a while, I managed to reproduce the defect: it happened only after driving more than 10 min on the highway (>100 km/h). Even with the transmission in defect, the only pcode was still p0501.
- The mechanics replaced the sensor with a new one. Things were better...
- ...but the transmission now goes into limp mode after driving more than 1 hour on the highway... I can drive 2 hours in city, it's fine. I drive more than 1 hour on the highway, I'm pretty sure to have the limp mode (shifting gear at 4000 rpm and no shifting to 4th gear, no manual mode). And still the only pcode is p0501...
- Interestingly, I don't have the "s" and "*" on the dashboard or any message about a transmission defect. If I wait at least 10 min with the engine off, the transmission is good for quite a few time - just turning off/on change nothing, i really have to wait at least 10 min.
-More interestingly, if I push the "*" button to go into snow mode, the transmission is fine (for a snow mode): shifts a low rpm, shift to 4th gear... If i remove the snow mode, the transmission is faulty again, and the sport mode is also faulty.
My mechanics told me I have to change solenoids... but as the transmission isn't faulty at all with snow mode, I think solenoids are good, right ? I would rather think that the ECU is faulty.
What do you think ? Does any of you have any clue or check I could do to be sure what is wrong ?
Thanks for reading and for your answers ! I currently need the car to go from Morayfield to Gold Coast (120 kms) everyday...
Khman
PS: English is not my native language, so I apologize in advance.