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Transmission issue 8HP70X
8HP70X DTC 4EC8 - Position sensor 4EC9 - Parking lock 4E98 - Transmission ratio monitoring, clutches A, B and D Here are the exact symptoms: When cold throws 4EC8 (position sensor) car drives forward and backwards and possible engage Park After couple minutes D and R not engaging shifts in N (N is flashing) unable to shift in to P Checked tranny fluid and is full but the fluid is really really dark and the filling plug was almost impossible to loose so clearly fluid never changed. First thing what I'm about to try is to change the fluid and filter but I'm not expecting that it will solve the problem. Seems like pressure issue. once the fluid warms a little won't shift. Does anyone know if it's worth to do valvebody rebuild and solenoids? Really don't want to spend money on rebuilt and solenoid kit just to find out that the internals of the tranny are shot. I rather skip that part and get another trans. |
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#2
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First, I'd check to see if the mechatronic sleeve has been leaking internally or if there is water intrusion in the plug for the EGS. That will cause all kinds of electrical errors to be reported. Leaking could also cause the tranny to be slightly low on fluid...
Then, I'd do a trans service including the tube/bridge seals, fluid, and mechatronic sleeve. If that didn't work... then I'd proceed to the more expensive stuff if you want to keep the X5. IE: rebuild the valve body. And then lastly replace the trans. I went through all of this with our 6hp26x in our X5.
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2005 X5 4.4i Build 04/05 Maintenance/Build Log Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles) 2006 X5 4.8is Build 11/05 Maintenance/Build Log Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles) 2010 X5 35d Build 02/10 Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles) |
#3
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Thank you for your reply. But what you're referring to are common 6hp issues. Bridge and seals not sealing properly causing pressure loss are very common on 6hp transmissions I was inside few of them but 8HP doesn't have these seals.
My question is if it's even worth the shot to try rebuild valvebody + solenoids as the cost would be nearly same as used transmission. But if I could avoid to pull this big boy out I would definitely prefer that. |
#4
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Quote:
After looking at the parts diagrams, in your case, I'd check the mech sleeve for trans fluid or water intrusion as a starting point.
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2005 X5 4.4i Build 04/05 Maintenance/Build Log Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles) 2006 X5 4.8is Build 11/05 Maintenance/Build Log Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles) 2010 X5 35d Build 02/10 Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles) |
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