Info on code #67

As my old dad used to say "they must have seen you coming"! Are you, young, female, blonde and cute? :>D

Engine tick is caused by play in the valve lifters and is an easy repair. It may have been the timing chain, but.... "Elantra's new, maintenance-free silent timing chain enhances engine durability while reducing noise." In normal circumstances, tick is not a reason to put in a new engine.

It sounds like your issue is bad connectors to the ECU. They spraying the connectors with electrical switch cleaning spray.

If that doesn't work, you need a good auto electrician with a professional grade scan tool computer to diagnose the issue. These computers can record exactly what happens to put the vehicle into Limp Mode.

https://www.google.com/search?q=auto+electrician+near+me

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limited info generic answer-check fluids and fuses/relays-have vehicle scanned for trouble code[s] sounds like in limp mode

you can get guide from many sites.. i know few
error codes/ fault codes, wiring diagrams, schematic diagrams, torque specs, engine info, switches functioning, assemble, disassembly, complete refurbish, repair, installation every single thing is covered
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the limp mode is triggered when certain parameters that protect the engine/transmission from serious damage are exceeded
having run the fault codes to determine what caused the failure and then having repaired those faults , it is a requirement that a scan tool is used to reset the ECM back to pre limp mode readings
There is nothing in the cpu program that reads when repairs have been effected so it is up to you to reset the system

what have you done to repair the fault that shows the codes?
from your statement you are removing the codes and resetting the ECM but the codes come back and the vehicle goes back into limp mode
one of the codes (p 0734 --0?) refers to gear 4--incorrect ratio===causes --wiring---TR sensor /switch ---shift solenoids---transmission mechanical fault
If that fault area is not fixed then the TCM doesn't know what gear to select so it goes to limp mode

You need to have the codes read for a good response. But you have a couple problems going on. No spark could be a fuse, crank sensor, wiring , or the computer. Limp mode is another problem. It could be a engine or transmission problem. Limp mode doesn't kill the engine, it puts the transmission in a certain gear so you won't be able to cause more damage.

EOBD II Error Code: P0705
Fault Location:
Multi-Function Transmission Range Switch - Malfunction (PRNDL Input) - Implausible Signal
Possible Cause:
Wiring/Connectors from/to Multi-Function Switch faulty.
Multi-Function Switch faulty.
Engine control module (ECM)/Powertrain control module (PCM)/Transmission control module.

Possible Solutions:
Check Wiring/Connectors from/to Multi-Function Switch.
Check Multi-Function Switch.
Check Measuring Value Blocks.

P 1751 Shift Solenoid" A" performance. The solenoid is part of the transmission valve body and yes if this solenoid fails you will get limp mode.The only solution is a new solenoid may be even the wires to it or even the transmission module

A quick learn is done with a high end multi-function scan tool. Which you will also need in order to pull trouble codes from the TCM to help you figure out why the transmission is going into limp mode.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Could be at least a dozen different causes. YOu're assuming that it has to do with your wiring. But you really don't know until you get trouble codes read. Guessing is not diagnosing. Get the codes read and THEN post the code here andask for help if you can't figure it out.