Questioncould anybody help,my jeep 4.0 has done 68,000 miles well looked after and the warning light came on,error code 1762 (the governor pressure sensor input was too high or too low for 3 consecutive park/neutral calibrations) now the jeep has gone into limp mode rang mechanic he said get a software upgrade before anything going to jeep on friday dont want to be hit with a £1,500 bill for rebuild when maybe not needed,just dont want to be ripped off can anyone please help.nigel
AnswerNigel,
*Always check to make sure the trans fluid level is good*
Well, unfortunately, this code isn't exactly a walk in the park. However, rarely is it near $1500 either. Although there is no separate Transmission Controller (engine and trans logic is in the same controller -- PCM), sometimes these codes are addressed through software updates. I've checked, and there are no PCM updates related to trans codes, particularly 1762. There is one for general driveability concerns, but I doubt it'll affect this.
As you know from the title, this code reports a failure in the governor pressure signal to the PCM. Governor pressure, in an auto trans, is like the lifeblood. The bulk of the testing is electrical, mainly conerning the circuit integrity between the solenoid and the PCM. It checks for shorts to ground and 5v, opens, and between the signal circuits. As it progresses, the diagnostic leads you to checking pressures with a pressure gauge -- to see if the actual pressure is different than what the PCM is reading electrically. Most times, the reading is off, and the solenoid or transducer is replaced (often part of a solenoid assembly -- might as well replace them while you're inside the pan). Every now and then the PCM is the culprit -- but when they go south, it's normally with multiple codes and symptoms, or none at all (just kaput!). Although the PCM has built-in circuit protection, a solenoid can possibly damage it. Very rarely is it an expensive transmission tear down procedure.
Hopefully, you have a reputable dealer in your area, with talented diagnosticians (yes, they do exist -- they're not *all* parts-changers). Just make sure that they call you if further diagnostic is necessary, and definitely before any work is done. There's a good chance it's an electrical issue, but since it's inside the trans, the labor will probably be greater than the part (even though the trans stays in the car). Some of the techs I used to work with did have a tendency to sell a valve body for things like this, though, so make sure they explain why they are replacing what they are replacing (since the solenoids come on the valve body, it's sometimes easier to replace the whole thing). Still, even when they did this, the car was still fixed, just at a higher cost (and dealer techs don't make a dime on parts!). Anyways, good luck and have faith, I'm sure it'll work out fine!
