transmission bangs on reverse and D with check parking aid warning light ON

2008 FORD EXPLORER
50,000 MILES • 4.0L • V8 • RWD • AUTOMATIC
Avatar
BIGBEARD
  • MEMBER
  • 4 POSTS
what im gonna do with a P0750, p0753,p0755,p0758, p0760,p0763,p0765, p0768 codes using a ford vcm on a 2008 ford explorer. We already replaced the transmission solenoid pack ,checked the wires for corrossion but still no luck. when I turn the engine the information center says "check parking aid" with the yellow wrench tool sign ON. We already overhauled the transmission. After a reset of the ECU, then I start the engine the warning light tool LITS ON eventhough i havent yet drove the car. which led us to replace the tranny's solenoid pack, but the problem was still there. A bang occurs as if there is no power on the solenoids. Thanks
Feb 12, 2014 at 8:27 AM
Advertisement
Avatar
HMAC300
  • CERTIFIED EXPERT
  • 48,601 POSTS
if you replaced the vcm it has to be programmed to your car as they are vin specific. also check the battery for condition including load test as a bad battery can give false codes. also dirty terminal ends.
Feb 12, 2014 at 9:58 AM
Avatar
BIGBEARD
  • MEMBER
  • 4 POSTS
sorry, i meant I used a ford oem scantool, vehicle communications module (VCM). My problems is the transmission bangs during Reverse, and sometimes on D.

Repairs done:
overhauled transmission
replaced solenoid pack
checked the tranny wire harnes
Feb 12, 2014 at 3:26 PM
Advertisement
Avatar
HMAC300
  • CERTIFIED EXPERT
  • 48,601 POSTS
did you check the battery like I said in last reply a low battery can cause false codes to pop up. the communication module doesn't have much to do with transmission unless you are talking about the pcm-powertrain control module.there is a tsb on certain solenoid problems from the ac drain you migh tcall the dealer to get it fixed as it might do it for free. If your build date is prior to 8/12/2009 this problem would be effected. this has to be removed (connector) then cleand of allwater and have dielectric grease put over it then covered with tape as shown in pictures.
Image (Click to enlarge)
Attached Media
Feb 12, 2014 at 3:40 PM
Avatar
BIGBEARD
  • MEMBER
  • 4 POSTS
yes, it still has a good battery, i checked on the clamps they are ok. cleaned the harness and fuses as well. there is a good battery voltage on the #3 wire going into the solenoid pack. this is a 5r55s transmission - it is common for these transmission to have a servo bore problem but when it was opened the intermediate bands and servo were ok & not cooked, , when it was scanned it didnt have the "incorrect gear ratio" code as described on its TSB.

Feb 12, 2014 at 3:55 PM
Avatar
HMAC300
  • CERTIFIED EXPERT
  • 48,601 POSTS
it is also other codes that deal with shifting and solenoids I would really suggest you take it to a trans guy and have him look at it.. see what he tells you .
Feb 12, 2014 at 3:58 PM
Avatar
BIGBEARD
  • MEMBER
  • 4 POSTS
yeah, my trans guy seems to be chasing his tail, thats why i am doing research work also.. thanks
Feb 12, 2014 at 4:04 PM
Avatar
HMAC300
  • CERTIFIED EXPERT
  • 48,601 POSTS
i'mnot really a trans guy but have you done all the electrical tests? because all these codes are for pinpoint test a as ford puts it. this cold be a bad pcm as well but kind of doubt it. the only other thing I can think of is the direct clutch has a problem like a sticky ball or something like that as it works in reverse and forward giving your the sometimes it does it in drive. good luck on this........
Feb 12, 2014 at 4:18 PM