P1529 Code

The code means that there is a problem with transmission. The Transmission Control Module (TCM) sends a signal to the Engine Control Module (ECM) indicating there is an issue with the transmission. You need to check the Transmission Control Module (TCM) for codes. However, not all scanners can read trans codes, so you need to be very specific when requesting to have the codes read. As far as ALL the things you have already done, NONE of them are going to help this issue or are even related to the problem. If someone told you they may help, find someone else that is more knowledgeable with this type of issue. Otherwise, you will be spending a lot of money on things that won't help.

Let me know if you have other questions.

Joe

Thanks.
According to your expertise. What should be done or replace for the TCM P1529 problem?

That is a generic code indicating an issue with the transmission. What needs done is to get a scanner that can read transmission codes. By doing that, it will provide more specific information.

Let me know if you have other questions.

Just change the input speed sensor and check the wires too but still the check engine is showing. If we will reset it, it works fine but if you turn off the vehicle and drive it again, the check engine shows up again. Can anybody tell us why we are still having this problem?

this TSB on the subject
DESCRIPTION
An improperly functioning input speed sensor or output speed sensor on a 1999-2001 Sonata, 2001 Elantra, 2001 Santa Fe and 2001 XG300 may result in the following conditions:
Harsh P-R or P-D engagement shock
Transaxle allows acceleration in 1st gear to 5000 rpm, then shifts into 3rd gear fail-safe
Check Engine light on
Diagnostic trouble codes:
P0715 (no input speed sensor signal - open/short)
P0720 (no output speed sensor signal - open/short)
P1529 (TCM MIL request to ECM)
REPAIR PROCEDURE
Check for DTCs in both the Engine and Automatic Transaxle menus. If you find:
DTC REPAIR PROCEDURE REFERENCE
DTC REPAIRPROCEDURE
P0715Replace input speed sensor
P0720Replace output speed sensor
P01529Erase code

Fig. 1: Identifying Input And Output Speed Sensors
Courtesy of HYUNDAI MOTOR CO.
Drive the vehicle for at least two key-on to key-off driving cycles. If the codes do not reset, return the vehicle to the customer. If P0715 or P0720 return, go to step 2.
Use a DVOM to check the resistance of the wiring between the TCM and the input sensors and output sensors. If the resistance is:
More than 1 ohm, repair or replace the wiring harness
Less than 1 ohm, go to Step 3.
Replace the transaxle control module (TCM).

shortly : make sure that timing belt is a justment 100% 100 .