Error Codes. 21ignition Signal And 54at Comm 09

[AntonRx7]

Hey just got the scan on my car and it comes up with 2 error codes and they keep coming back. they are

21 Ignition Signal -Primary

54 AT Communication Line

also got

09 Vehicle speed sensor AT

anyone have any idea what the this stuff is? how to fix it?

only problem i seem to have with the car is the transmission sometimes sticks in 1st or neutral but it goes back to normal if i turn car off then on again.

thanks

[Sumo]

Ignition signal would be generated by your Crank Angle sensor I think, and AT (Automatic Transmission) might have a broken wire or fault sensor in the gear box.

All you can do is tow it to an electrician and ask him if he can test the CAS, Im not familiar with the CAS on the skylines, I have only tested commodores so i cannot offer you any info

[AntonRx7]

ok from what i can see the ignition signal primary, problem should be just a slight drop in voltage or something with the ignition key as the code does not come up untill you start it (doesn't come up with just ignition on) so i figure thats not a problem as car seems to run fine and i would know if it was running in limp mode as it seem to drive normal.

the AT communication line doesn't always come up straight away so no idea wats going on with that one

and yesterday i noticed another code under the auto trans which was the 09 Vehicle speed sensor AT. now this code is probalby what is causing it to stay in first sometimes as this code comes and goes randomly.

anyway anyone else have any info so i can try sort it let me know

[AntonRx7]

still can't find the problem and hasn't done it for a while. Surely someone has fixed this problem before with the transmission as i have seen a few post with the same problem just no answers.

Anyone know where the speed sensor on transmission is?

[ed]

igition could be a faulty coilpack.

try borrowing someone's coil packs that are known to work.

[AntonRx7]

i have some spare coilpacks.

wouldn't i know if the coilpack was dodge? cause it seems to drive fine.

[AntonRx7]

ok am getting some more gearbox sensors so that will propbably sort out the speed sensor gearbox problems.

Anyone have any idea about the primary ignition signal problem the module has been replace and it seems to drive fine.

Could there stillbe a problem with one of the coils maybe? i have some spare ones