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Jerry, Master Mechanic
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Hello, i have a 2001 hyundai accent. the transmission recently

Resolved Question:

Hello, i have a 2001 hyundai accent. the transmission recently was rebuilt in late june of 08. This past weekend, i was driving it and when it got around 45-50 mph, the gear seemed like it was sticking. the check engine light came on. So naturally i took it back to AAMCO where they rebuilt the trans and the mechanic told me it had an engine problem and the error code is P1529 I L control problem. how can i resolve this problem on my own?? any feed back would be greatly appreciated in these hard economic times. thanks.
Submitted: 8 years ago.
Category: Car
Customer: replied 8 years ago.

2001 Hyundai Accent 4 cylinder

Already Tried:
AAMCO where i had the transimission rebuilt.
Expert:  Jerry replied 8 years ago.

Hello and welcome to Just, Super mechanic here. About your vehicle.


That code is an indication that the trans controller has requesteed that the PCM turn the light on.

There are many things that can cause that, however, there has been a service bulletin on some that has to do with the diode in the TCM power circuit.


You might want to try getting a non biased shop to confirm that there are no issues with the (rebuilt) trans.


Here is what one of the bulletins states. See if yours may be in this one.




Number: 03-40-001

Date: FEBRUARY, 2003

Model: 2000-2002 ACCENT ATM




Some 2000-2002 MY Accent vehicles may experience ATM diode pin corrosion in the control wiring harness located behind the dash panel. Water from the cowl top panel may enter through an improperly sealed control wiring harness grommet in the dash panel.

A corroded ATM diode may result in the following symptoms:

^Diagnostic Trouble Code P0707 (Transaxle range switch - Open circuit)


^Diagnostic Trouble Code P0708 (Transaxle range switch - Short circuit)


^Diagnostic Trouble Code P1529 (M/L-on request signal to ECM


^Diagnostic Trouble Code P1586 (Encoding signal circuit not rational)


^Harsh shift and transaxle held in 3rd gear fail-safe


If a vehicle with these symptoms is being serviced, follow the ATM diode replacement procedure provided in this TSB. Do not replace the automatic transaxle or control wiring harness.


^Model: 2000-2002 ACCENT vehicles with automatic transaxles


^Affected vehicle production date range: Produced through April 30, 2002


^Affected vehicle identification number (VIN) range:


-3 Door: Produced through KMHCG35CO2U22O100


-4 Door: Produced through KMHCG45C02U375204



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Customer: replied 8 years ago.
i just came from auto zone and now i have theP1529 code and the P0734 code. This code states fourth gear incorrect ratio. any ideas??

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