The code p1762 in a Grand Cherokee shows possible transmission problems. Low Transmission Fluid could be the cause. Make sure that the fluid is full then check again.
Check level of transmission fluid Change transmission fluid and filter
Remove the plug in the center of the cover. Fluid level should be even with the bottom of the hole.
Check for low fluid level, or a loose filter inside the pan.
Your thermostat is probably stuck preventing the flow of coolant to the radiator. This is an inexpensive fix.
That is an oil level sensor.
The transmission may not be building up pressure until the fluid warms up. Check the fluid level to make sure that its full, then check the transmission filter as it could be stopped up.
Right side of the oil pan.
Check the level of the power steering fluid. A low level or no level of fluid will cause the groaning noise.
On the differential there should be a plug with a 3/8 or 1/2 inch square on it that you can use a socket wrench to remove, just stick your finger in and feel if there is fluid. If there is no fluid, fill to that level.
For a 2000 Jeep Grand Cherokee Laredo, it's generally recommended to change the transmission fluid every 30,000 to 60,000 miles, depending on driving conditions and usage. If the vehicle is frequently used for towing or in severe driving conditions, more frequent changes may be necessary. Always consult the owner's manual for specific guidelines and recommendations for your vehicle. Regular checks of the fluid level and condition can also help determine the best maintenance schedule.
Next time, add some more detail to your question, but FIRST, check your tranny fluid level. When the transmission fluid level is low, your vehicle will start to act REAL funky and make weird noises and your question may hint at low fluid level. If it's not that, take a close look at what the fluid looks like and smells like. And then schedule for an appointment with a trusted mechanic to check out your transmission looked at. Maybe, you just need band adjustment or fluid replaced because it's old fluid and worn out.
fuel level sending unit voltage is too high