Help!! I'm desperate! P0500 & P0600 codes, Check engine light, Shifts Good

[dudealex1]

Help, my last transmission went kapoot on me in my 1996 Infiniti I30 with 100,000 miles. I probably wrecked it driving like an a$$ and in 9 inches of snow. Anyway, I started getting these codes along with a 4th gear ratio error about 1 mo. before my transmission died (would rev. to 2000-4000 RPM, and break the tires loose anytime I came to a complete stop and tried to restart)

Now, I got a transmission from a 1998 I30, and had it installed and the computer reset. About 20 Mi. (2 days) later, it came back on and I read P0500 (VSS) and P0600 (A/T Serial Comm. Line) with a cheap OBDII code reader from O'Reilly's. I brought it in for the transmission to read (with a much nicer scanner that hooked to the transmission computer I think), and he tried 3 times with error before he got it to read. At first, he got the same codes I did, but as it warmed up, he said random codes would appear, disappear, and reappear.

By the way, I have had 3 different VSS in either transmission.

I have tried resetting this several times, but it comes back anytime between 4 hours and a month later.

The car drives perfect below 2500 RPM, but you can feel the shifts (pretty hard even if you let off the gas when it shifts) if there is anything above that (which may or may not be normal). The speedometer and RPM gauge function normally, and I have no loss in power. The cruise control works on and off, but if I get it set, it will ork anywhere from 5 min. to 45 min.

I've searched this forum along with countless others and have found no cure although 3 or 4 other people had this exact problem but nobody could help. Lets be the FIRST to find the problem.

If we can't fix this, I will bring it to the dealership, and I call those desperate measures. The car computer/electronics repair guy says he won't touch it and to bring it to the dealer because the computer has to be reprorammed to the new transmission. This doesn't make sense to me because I got the code with my old transmission.

THANK YOU to ANYBODY who helps!!
Modified by dudealex1 at 9:27 PM 5/29/2007

[dudealex1]

Anybody?

[dudealex1]

Bump

[maxhopper]

I would start with the P0600 concern. Check the TCU for loose connections.

[dudealex1]

Thanks, I did have the shop try this, and they said the connections and cable looked fine.

[MinisterofDOOM]

This one is weird. Why are you getting a VSS error when the Speedo works properly?

Have you been able to try a different TCU in the car?

[dudealex1]

No I haven't, is it true that they have to be reprogrammed for a different transmission, or was that guy mistaken?

[sheadee240]

please see the attached link it sounds like you have broken wires in your harness its a known problem http://autorepair.about.com/li...e.htm

[allensteiner]

please see the attached link it sounds like you have broken wires in your harness its a known problem http://autorepair.about.com/li...e.htm

you must not have looked at the date of the posts in this thread...

[bpomps]

please see the attached link it sounds like you have broken wires in your harness its a known problem http://autorepair.about.com/li...e.htm

thanks for that link........ im having similar problems, maybe this is the cause.

[sheadee240]

you must not have looked at the date of the posts in this thread...

I saw the dates, but I thought that that link had some good info which could hopefully help people before they start throwing speed sensors and instrument cluters in their cars, which they may not need. These broken wires in the wire harness can intermittently go back and forth from open circuit to closed circuit causing people to try replacing the same parts multiple times. I think a helpful post in an old thread might be better than an allensteiner post in any thread.

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