DTC P0963 P1729

P1727 Auto Trouble Code - Auto Trouble Codes

https://p1727.autotroublecode.com P1727 Auto Trouble Code description with all kind of problem on car models. Find the repair process of P1727 OBD 2 engine fault code.

Common Trouble Codes ' DGTech

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P1727 Coast Clutch Solenoid Inductive Signature Malfunction; P1728 Transmission Slip Error; P1729 4×4 Low Switch Error; P1730 Gear Control Malfunction 2,3,5 ...

old post and so wrong..... seen this endless for noobs, and jeeps.
DTC jeep.
p1 is factory code
P17 - tranny.
first off many jeeps have 2 or more transmissions options new.
this car has 6 different transmission and engine choices new
sure the CVT box you have,
the other 3 are M/T boxes (stick shifted)


ever worked on modern A/T boxes seems not to me.
for sure not CVT boxes nor Jeeps. with it.

first off do not read non jeep books or that DTC code you will read lies. P1 is jeep only code. called factory jeep codes.
P0 codes are federal generic codes
P1 ,P2, and up are factory codes JEEP.

Transmission Ratio Control Circuit (Failure it is)
off the real service manual it states


P1729-TRANSMISSION RATIO CONTROL CIRCUIT For a complete wiring diagram, refer to the Wiring Information.
Theory of Operation
The Transmission Control Module monitors and controls the gear ratio by the use of a Step motor that transfers electrical power to mechanical movement. The rationality is a continuous test that monitors the Step motor movement. If the Step motor ON/OFF status does not match the TCM requested ON/OFF status a DTC will set.

• When Monitored:

Ignition on with a system voltage between 9.0 and 16.0 volts.

• Set Condition: If the Step motor ON/OFF status does not match the TCM requested ON/OFF status for the period of 200 msec the DTC will set. It takes two consecutive problem identification trips to illuminate the MIL.
  

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this means the stepper motor in the transmission is failing
via the .
TRANSMISSION CONTROL MODULE even it bad
wiring from it to box bad (box = tranny as in gear box)
wiring at box or inside box bad.
or the Stepper motor inside is shorted, or open or bad.
the manual shows checking voltage and ohm here , got the manual.
even at alldata.com

only jeep can fix this, for sure to find true cause

they have in the jeep shop the CVS testing system you do not have.
nor anyone else.

check here...

https://www.fixya.com/cars/t24757878-tcm_2008_jeep_compass_located


Best to you

DTC P1778 STEP MOTOR - FUNCTION ...............176 Description ...........................................................176 CONSULT-II Reference Value ..............................176 On Board Diagnosis Logic ...................................176 Possible Cause ....................................................176 DTC Confirmation Procedure ...............................176 WITH CONSULT-II ............................................176 WITH GST ........................................................177 Diagnostic Procedure ...........................................177

DTC P1778 STEP MOTOR - FUNCTION Revision: 2004 November 2004 Murano DTC P1778 STEP MOTOR - FUNCTION PFP:31947 Description ACS0021D ? The step motor's 4 aspects of ON/OFF change according to the signal from TCM. As a result, the flow of line pressure to primary pulley is changed and pulley ratio is controlled. ? This diagnosis item detects when electrical system is OK, but mechanical system is NG. ? This diagnosis item detects when the state of the changing the speed mechanism in unit does not operate normally. CONSULT-II Reference Value ACS0032Q Remarks: Specification data are reference values. On Board Diagnosis Logic ACS0032R ? This is an OBD-II self-diagnostic item. ? Diagnostic trouble code "STEP MOTR/FNC" with CONSULT-II or P1778 without CONSULT-II is detected under the following conditions. - When not changing the pulley ratio according to the instruction of TCM. Possible Cause ACS0032S Step motor DTC Confirmation Procedure ACS0032T CAUTION: ? Always drive vehicle at a safe speed. ? Be careful not to rev engine into the red zone on the tachometer. ? Before starting "DTC Confirmation Procedure", confirm "Hi" or "Mid" or "Low" fixation by "PRI SPEED" and "VEHICLE SPEED" on "DATA MONITOR MODE". ? If hi-geared fixation, go to diagnostic procedure soon. NOTE: If "DTC Confirmation Procedure" has been previously performed, always turn ignition switch OFF and wait at least 5 seconds before performing the next test. After the repair, touch "ERASE" on "SELF-DIAG RESULTS" and then perform the following procedure to confirm the malfunction is eliminated. WITH CONSULT-II 1. Turn ignition switch ON and select "DATA MONITOR" mode for "TRANSMISSION" with CONSULT-II. 2. Make sure that output voltage of CVT fluid temperature sensor is within the range below. FLUID TEMP SEN: 1.0 - 2.0V If out of range, drive the vehicle to decrease the voltage (warm up the fluid) or stop engine to increase the voltage (cool down the fluid) Item name Condition Display value (Approx.) STM STEP (step) During driving -20 step - 190 step GEAR RATIO 2.37 - 0.43

DTC P1778 STEP MOTOR - FUNCTION CVT-177 D E F G H I J K L M A B CVT Revision: 2004 November 2004 Murano 3. Select "DATA MONITOR" mode for "TRANSMISSION" with CONSULT-II. 4. Start engine and maintain the following conditions for at least 30 consecutive seconds. TEST START FROM 0 km/h (0 MPH) CONSTANT ACCELERATION: Keep 30 sec or more VEHICLE SPEED: 10 km/h (6 MPH) or more ACC PEDAL OPEN: More than 1/8 Selector lever: D position ENG SPEED: 450 rpm or more 5. If DTC is detected, go to CVT-177, "Diagnostic Procedure" . WITH GST Follow the procedure "WITH CONSULT-II". Diagnostic Procedure ACS0032U 1. CHECK STEP MOTOR ? It is monitoring whether "GEAR RATIO: 2.37 - 0.43" changes similarly to "STM STEP: -20 - 190" by "DATA MONITOR" mode. Refer to CVT-64, "DATA MONITOR MODE" . ? If no CONSULT-II, inspect the engine speed (rise and descend), vehicle speed, throttle opening angle, and check shift change. OK or NG OK >> INSPECTION END NG >> Replace the transaxle assembly. Refer to CVT-224, "Removal and Installation" . S








Step motor DTC Confirmation Procedure ACS0032T CAUTION: ? Always drive vehicle at a safe speed. ? Be careful not to rev engine into the red zone on the tachometer. ? Before starting "DTC Confirmation Procedure", confirm "Hi" or "Mid" or "Low" fixation by "PRI SPEED" and "VEHICLE SPEED" on "DATA MONITOR MODE". ? If hi-geared fixation, go to diagnostic procedure soon. NOTE: If "DTC Confirmation Procedure" has been previously performed, always turn ignition switch OFF and wait at least 5 seconds before performing the next test. After the repair, touch "ERASE" on "SELF-DIAG RESULTS" and then perform the following procedure to confirm the malfunction is eliminated. WITH CONSULT-II 1. Turn ignition switch ON and select "DATA MONITOR" mode for "TRANSMISSION" with CONSULT-II. 2. Make sure that output voltage of CVT fluid temperature sensor is within the range below. FLUID TEMP SEN: 1.0 - 2.0V If out of range, drive the vehicle to decrease the voltage (warm up the fluid) or stop engine to increase the voltage (cool down the fluid)

You did not post the year of the vehicle Newer model years can forget what the programming is when the battery is disconnected and the only way around the issue is to have a dealer re-flash the TCM. This is not cheap.

check oil level in the transmission
run the fault codes as it could be a problem sensor
make sure that only CVT transmission oil is used as ATF oil destroys CV transmissions

You need to have the transmission check for codes and operation concerns.

the CVT light is associated with the transmission. I don't think changing the fluid/oil in the transmission will help. you need to find a shop that can access the transmission control module to fint out ant fault codes and go from there. could be a simple speed sensor or shift control solenoid.

Code translates as :-
P1729 = Transmission Ratio Control Circuit