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Re: Does anyone know what this means Transmission...
Have you changed tires and wheels to a different size? If so, that will cause a code to come up. The gear ratio is set as a value in your computer. If you change tire sizes that will cause this problem. You can have this recalibrated at your Pontiac dealer. Good luck! Phil
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as the gears in an auto transmission are in constant mesh , being sun and planetary gears , it is impossible to have an incorrect ratio as such
however when the TR sensor (transmission ratio sensor) becomes faulty it doesn't know whether to use the bands or clutches and so the transmission is in limbo so to speak
that in turn applies bands or clutches incorrectly
The TR sensor reports to the transmission control module and is dependent on speeds from the VSS sensor that also determines when ratios are changed --ie when bands or clutches are applied
the fix is normally a TR sensor and /or servos / solenoids
The purpose of the automatic transmission is to match the engine's optimum power and torque characteristics to the driver's desired rate of acceleration and speed by auto-selecting different gear ratios or 'speeds' to power the wheels.
This means that you have a problem in the shift solenoids of this electronically controlled transmission or a fault in the mechanical part of the transmission, this can be hydraulic fluid pressure loose or a defective valve body. In order to know the exact nature of the fault with 2nd gear some diagnostic testing must be done.
P0734=A/T 4th gear incorrect ratio. This has nothing to do with the speed sensor. If the speed sensor was faulty, it would also set OTHER gear incorrect ratio codes. My experience tells me the 4th gear incorrect ration indicates the torque converter clutch (TCC) is slipping and nothing more. Unless there was a speed sensor DTC (Diagnostic Trouble Code), the sensor is not the issue (yet). The fact P0734 was set (trust the computer), the TCC is slipping (out of range). Question: Maintenance history may indicate the wrong transmission fluid may have been introduced. Hyundai's Transmission fluid is strictly SPIII... there is no substitute. The incorrect fluid will cause 4th gear slippage. Now, having said that, it doesn't mean the 4th gear (lock-up) clutch isn't worn out. Have a qualified/certified Hyundai Service Technician properly diagnose this issue.
po 443= purge solenoid circuit
po 730= incorrect gear ratio, transmission problem
po 751= 1/2 solenoid problem
po 756= 2/3 solenoid problem
other 2 have no listing on alldata
you should seek professional help with these trans codes.
check ALL fuses first
Incorrect Gear Ratio, means the transmission is slipping, the clutches are worn out, in other words, you will need to rebuild the transmission which may cost anywhere from $1000-1800. The Kelly Blue Book is about $2800 in Fair Condition, I would pass on purchasing this vehicle unless the person is willing to fix the problem with the transmission and offer you a Warranty for the repair.
Trouble Code-P0734 (A/T Additional Gear Ratio Error In Fourth Gear)
Trouble Code Conditions: Vehicle driven to a speed of 4-37 mph at more than 500 rpm, gear selector in 4th Gear in Drive, and the PCM detected too much difference in the engine speed and output shaft speed.
Customer may complain of intermittent 4th gear operation
O/D and 2/4 pressures less than 75 psi
O/D or 2/4 clutch volume indexes out of specification
O/D accumulator seals are damaged
Transmission enters "limp in" mode running in 4th gear
Trouble Code-P0735 (A/T Gear Ratio Error Fourth Prime)
Trouble Code Conditions: Vehicle driven any forward Gear, and the TCM detected the ratio of the Input speed to the Output Speed did not match the current Gear Ratio (this test can take up to 5 minutes).
Related Gear Ratio trouble codes may be stored (note that some of these Gear Ratio trouble codes may be intermittent)
Transmission has internal problems or damage present
code p 0730 refers to incorrect gear ratio===causes --wiring---R ( transmission ratio) sensor /switch---shift solenoids--transmission mechanical fault
you say that the transmission runs well except for the jerk so the transmission is good
It indicates that the TR sensor is faulty so take it to an accredites auto transmission specialist shop for a proper diagnosis and quote to replace the TR sensor