My car resets all info nearly every ignition cycle and is driving me crazy. Not "on" position, but only when I engage the starter. Fuel, trip, radio settings, etc...(and resets to metric!). I have no trouble other than that(or codes), and it has happened with 2 different batteries now. I thought it was the connections, but they seem fine? Charging system is fine, and battery never is low. Any ideas? Maybe a module?

 

Geez, that's friggin odd to say the least! I don't know but am all

Where's the Bills at? C or Do!!!!! Turn on the Bat signal!!!!!!

 

It sounds like one of your buttons is sticking.

 

I know it sounds weird, but mine resets all DIC information if I start the car with the door open. Door closed, I can go 1000's of miles without a reset.

Also, toggle to your voltage, if your PCM dips below about 11.5 volts while starting it can lose your DIC settings also.

 

Anyone else?

 

The only thing I have seen that makes the DIC reset it a bad battery. It has enough to crank over but it dips below a certain point.

 

How old is your Battery?

 

About a year and a half, pretty sure it is not the battery, it always has plenty of power.

 

Have you monitored your dic voltage while cranking? A good friends C5 reads at least .5 volts less at the DIC than at his battery and it continually causes all sorts of issues for him. Grounds are often the issue in this case.

 

I have almost the same problem on my 98, the only thing is that only the average fuel resets nothing else. The trip meter does not reset.

 

My 04 Z06 did this for months, before the battery showed signs of going
bad. Put in a new battery and so far the fuel average does not reset
when cranking.

 

I SAW IT!!

That C5 emblem shining in the sky!!!!!!!!!!!

You guys that had battery on the brain,,,

Its most likely a battery issue. Yep, I hear you saying, "But my car starts just fine every morning"

Battery voltage is inversely proportional to battery current. When the starter is engaged (especially on a COLD engine) it draws 350-450 AMPS! As the amps or current draw goes HIGH, the battery voltage will drop as low as what it has stored or can produce. So,,if you have a battery that has a LOW charge from sitting or is old, it wont be able to maintain 12 VDC and may drop as low as 8 VDC and still start the car. Remember ,,,you have a 550 CCA battery

Once a module senses a voltage less than its low voltage cut off voltage, it shuts down for the period of time that the voltage is LOW. When it rises above the cut off, the module turns back on operates normal again and flags a HISTORY DTC i.e. U-1036 H indicating it had a bad day.

Put a digital volt meter directly on the battery terminals. I use LONG leads and monitor the meter in the car. You should see 12.5 VDC -13 VDC. If you see less,,you battery is low charged or aged.

When you cold crank your engine, watch the battery voltage. If it is dropping very LOW (like 9 VDC) thats the issue. If you examine your DIC DTCs,,you will most likely see a ton of U series DTC. They usually are a result of low module voltage as a result of a marginal, aged or bad battery.

What you should do is have your battery FULLY charged then take it to auto zone or advance and have them check the battery under LOAD to see if the cold cranking capacity is adequate.

If you have the battery fully checked out and it test SAT, I have some other things to check.

Bill C

 

Forgot to mention. If the module IPC or SCM shuts down, all the MEMORY stuff defaults to the factory settings.

BC