Heyy Scotty I got a 07 Santa Fe v6 and I just replaced the engine it has 189000km automatic transmission.
when I start the car in the morning and drive it it drives fine and starts at 1st gear but when I drive it up to 3rd or 4th gear the transmission does not downshift from 3rd gear even after coming to a full stop, it starts accelerating at 3rd gear and it’s very slow I can’t even take advantage of the manual mode on the car it just downshifts to 2nd gear and that’s it and after turning off the engine and let it cool down, it automatically goes to 1st gear. is it the down shift solenoid that’s gone bad ? And when I scanned on obd2 scanner it only said that 1 of the o2 sensors are shot
You have internal issues with that transmission. It will likely need to be replaced.
You already replaced the motor. I would cut my losses and get something more reliable with lower mileage and avoid Hyundai.
An engine going out at 189,000 kms (117,000 miles) should’ve been your first cue to get rid of your clunker.
Now, you're stuck up the creek without a paddle..
How much more of a money pit does it need to turn into, before you get rid of it?
It was actually my mistake I let it heat up twice it was just a minor leakage in the radiator and the heat gauge was broken so I didn’t know that the engine was hot until I saw smoke coming out of the exhaust if it wasn’t the leak the engine would run fine till now
Why was the radiator leaking?
The upper hose had a leak and it squirted coolant all over the engine
What (I assume) InThrustWeTrust said is that the radiator leaked because the hoses are probably low quality and not your fault.
Exactly
It sounds like your Santa Fe is going into "Limp Mode".
“Limp Mode” occurs when the value sent by a sensor to the computer is not within a pre-programmed range.
Sensors such as MAP, TPS, and VSS (vehicle speed sensor) or the trans temp sensor to name a few.
Also, the wiring harness going to the transmission should be inspected and tested.
If the transmission loses voltage or communication with the ECM it will default to Limp Mode.
In Limp Mode, the computer shuts off the electronic shift solenoids. This disables the transmission’s ability to shift gears and causes it to default to a single usable gear (usually second or third).
In addition, the pressure in the transmission’s fluid lines is set to high in order to protect the bands and clutches from being damaged.
The signals that control the line pressure are set to “full on” to prevent the clutch pack from a slipping dangerously.
If you don't have any stored codes then you'll have to pay to have your Santa Fe connected to a dealer level scanner to determine which sensor or module is malfunctioning or if the issue is emanating from a sensor reporting a problem in the transmission
Another Hyundont tranny bites the dust
