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2000 Hyundai Transmission Malfunction - LOSS of 2nd, O/D and REVERSE
OBDII CODES: P1624, P0722, P0732, AND P0734
2000 Hyundai Elantra 4spd O/D automatic transmission shifting malfunction/failure
As this is an old post, I wanted to add some clarifications. LOSS of Second gear, O/D (or fourth gear), AND loss of reverse (KEY WORD "AND") **This gear loss combination ONLY**:
This occurs when the splines if the ALUMINUM Kickdrum get shredded.
MANUALLY CAUSED DAMAGE:
This is CAUSED by a VERY HARD down shift (such as aggressive passing), Manually downshifting to Second gear (or First gear - while well above lockout speeds) at speeds exceeding 50mph (approx), OR shifting into REVERSE WHILE VEHICLE IS IN FORWARD MOTION (any forward motion, but usually above 10mph).
ADDITIONAL FAILURE: The ABOVE also is often caused BY a shifting MALFUNCTION which is caused by a DAMAGED wiring harness INSIDE the transmission. (Avg occurrence at 120k+miles)
Technical: Internal wiring harness damage due to prolonged heat exposure (hardening of wiring insulation, stiffening), AND CHAFFING of the wiring insulation against shift-control-input side of valve body assembly, where VIBRATION against the body causes intermittent solenoid control malfunctions or incorrectly timed activation, leading to physical damages.
INSPECT/REPLACE KICK DRUM (with re-designed STEEL-HUB version), REPLACE internal wiring harness if ANY damage or wear is visible!
DISCLOSURE: A SCAN-TOOL capable of TESTING AND ACTUATING SOLENOIDS (not just a CODE READER) WILL BE REQUIRED FOR ACCURATE TESTING of Soleniods, wiring, history codes, pulse generator ( A&B ) functions, speed sensor, as well as all functions of the TCM.
CODES PRESENT: P1624 (MIL REQUEST from TCM), P0722 (Pulse generator - gear out-of sync malfunction), P0732 (Second gear ratio incorrect), P0734 (Fourth gear/Overdrive gear ratio incorrect), as well as a few other possible codes such as temp, or other malfunctions caused by wiring shorts. TCM damage IS POSSIBLE as well (keep this in mind and have PROFESSIONALLY CHECKED, by a QUALIFIED HYUNDAI MECHANIC or a transmission mechanic with TRUE SCAN-TOOL-FLASH CAPABILITY
FOOTNOTE: ALSO CHECK FOR CURRENT SOFTWARE!
(I REALLY HATE seeing lots of questions and VERY FEW ANSWERS! I REALLY HOPE THIS HELPS future readers.)
This stuff CAN be VERY TECHNICAL and goes FAR BEYOND "turning wrenches". Learn to use the car's computer as your friend, not as a "complication" that makes fixing cars harder. Even though the computer MAY not always seem to be correct in identifying a problem, there is ALWAYS a connection between a 'mis-reported' malfunction and the REAL malfunction. Open circuits and bad grounds, as well as short circuits can wreak havoc! (There IS a DIFFERENCE between "SHORT CIRCUIT" and "OPEN CIRCUIT"!)
If YOU DO NOT KNOW THE DIFFERENCE, PUT DOWN THE WRENCHES, SCREW DRIVERS AND HAMMER, UNTIL YOU DO!!!
Great job to rdavis55 for his contribution to this thread!