Re: Tranmission Codes P0700 and P0762 - 06 3.7L GC - Someone care to help ???
Almost 50 views and no replies so here goes my theory alongside with some research I did and found this info on a cadillac forum
Most like it's a shifter bezel problem and worst case scenario the transmission needs servicing (drop pan, clean and change filters)
Object Number: 798836 Size: SF
The 4-5 shift solenoid (SS) valve is a normally-closed exhaust valve. When the 1-2 and the 2-3 SS valves are both OFF, the 4-5 SS valve turns OFF to shift the transmission into 5th gear. When either of the other two shift solenoids are ON, the 4-5 SS turn OFF in order to enable powertrain braking. The 4-5 SS valve is attached to the control valve body, within the transmission.
The TCM monitors the actual gear ratio, and compares the actual gear ratio with the commanded gear ratio. DTC P0762 sets under two conditions:
* A stuck ON 4-5 SS valve
* A stuck ON 4-5 shift valve
If the TCM detects a 1-2-3-4-4 shift pattern, then DTC P0762 sets. DTC P0762 is a type B DTC.
Conditions for Running the DTC
* No throttle system DTCs P1791 or P1795.
* No OSS DTCs P0722 or P0723.
* No ISS DTCs P0716 or P0717.
* No IMS DTCs P1815, P1818, P1820, P1822, P1823, P1825 or P1826.
* No shift solenoid electrical DTCs P1842, P1843, P1845, P1847, P1864, or P1865.
* No TCC performance DTC P0742.
* No engine delivered torque signal DTC P1779.
* The ignition voltage is 8-18 volts.
* The engine run time is greater than 5 seconds.
* The IMS indicates D2, D3,D4, or D5.
* The transmission fluid temperature is 20-130°C (68-266°F).
* The accelerator pedal position (APP) is greater than 10 percent.
* The input shaft speed is 200-6,800 RPM.
* The output shaft speed is greater than 100 RPM.
Conditions for Setting the DTC
The following conditions must occur twice during the same trip:
* The TCM has commanded either 2nd or 3rd gear for 4 seconds or greater.
* The TCM commands 5th gear.
* The engine torque is 36-350 N·m (27-258 lb ft).
* The resulting gear ratio is 0.98:1-1.03:1 for 3.5 seconds.
Action Taken When the DTC Sets
* The TCM requests the ECM to illuminate the malfunction indicator lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met.
* The TCM turns off the pressure control solenoid. When the pressure control solenoid is off, line pressure is at maximum and updates to the transmission adaptive pressure (TAP) memory cells are discontinued.
* The TCM inhibits 5th gear.
* At the time of the first failure, the TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as a Failure Record.
* At the time of the second failure, the ECM records the operating conditions when the Conditions for Setting the DTC are met. The ECM stores this information as a Freeze Frame.
* The TCM stores DTC P0762 in TCM history.
Conditions for Clearing the DTC
* The ECM turns OFF the MIL after the sixth consecutive drive trip in which the TCM does not send a MIL illumination request.
* A scan tool can clear the DTC.
* The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without a non emission related diagnostic fault occurring.
* The TCM cancels the DTC default actions when the ignition is OFF long enough in order to power down the TCM.
Here is some additional info to why the TRANSMISSION SHOULD NEVER BE FLUSHED !!!
"Transmission Flushing - Good or bad?
Never, ever flush a transmission. There is no "safe" way to flush a transmission unless you own the flush machine and control it yourself.
Flushing a transmission has several pitfalls...
The most obvious is that the last vehicle hooked up to that flushing machine probably was on it's last leg and was generating tons of debris. Most owners, when the transmission starts to act up, rush to get a "flush" in the fervent hope that it will cure the problem. So... flush machines, by definition, see the worst of the worst. If the lines aren't cleaned, hooked up improperly, oil is reused or recycled, etc....then you are screwed as your transmission gets the dose of debris from the last transmission . No matter how good the intentions of the shop, one simple mistake and your transmission gets the debris.
Flushing is supposed to negate the need for removing the pan, cleaning the debris and replacing the filter... BS. There is considerable debris coating the inside of the transmission pan with miles as anyone who has done this can attest. That is part of the maintenance, removing the pan, cleaning the screens and replacing the filter and cleaning the pan.
All that debris in the pan is laying around in areas where there is little oil flow by definition... it tends to settle in the areas where the oil is quiet and just lies there not hurting anything.... until the "flush" stirs it up and circulates it thru the transmission. What a concept...
Reverse flush????? What logic makes anyone think that it is a good idea to reverse the oil flow path in a reverse flush and flush sediment and debris into areas that are normally protected by filters, etc...???? Stupid idea. Period. No other way to describe it.
"Transmission flush" machines are money makers for the shops and dealerships because they are quick and easy and they can actually charge more money for it under the guise of it being "better" for the transmission... when it is really a detriment.... suckers are born every day...
Read the factory service manuals and point out the place where a transmission "flush" is recommended.
So what if all the oil cannot be removed. A "flush" doesn't remove it all either.
If you really really want to replace as much oil as possible in the transmission, drain the pan, service it by removing/cleaning/changing the filter and reassemble. Refill the transmission with fresh fluid. Disconnect one of the cooler lines at the radiator, put it into a bucket and start the engine. Let the transmission oil pump purge the old oil into the bucket so that nothing is subjected to abnormal oil flow. Start pouring oil into the transmission to keep it full while the idling engine/transmission oil pump purges the fluid thru the system. Easy and quick and gets ALL the fluid out... and eliminates any risk of hooking up to a "flush machine".
FORGET THE IDEA OF FLUSHING YOUR TRANSMISSIONS. Normal transmission maintenance is a good idea. Drop the bottom pan, change the filter and clean everything up and refill the transmission with fresh fluid. Do the cooler line/bucket purge if you are really fastidious about changing all the fluid... but... DO NOT hook your transmission up to a flush machine.
Really now, would you get a blood transfusion from an unknown source that is reusing needles... about the same thing if you think about it. A flush will do absolutely nothing more than a good drain and refill will accomplish... and potentially a lot of harm. Do not take the risk. Just because some have had good experiences (or the lack of a bad experience) with a flush does NOT mean that they will always go good."