This is odd...

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Jan 19, 2024 | 07:08 AM

Ron C!

Thread Starter

Safety Car

Joined: Jan 2000

Posts: 3,902

Likes: 248

From: Orlando FL

This is odd...

My 01 Vert, 6M, 50K miles. Lately I have noticed that when I drive the car after it has been sitting for a week or so, the MPG has reset and odometer comes up on the DIC rather than the page previously set. The HUD is also at the default page. The car has had no loss of power, starts right up. Optima red top less than 2 years old. It also has developed a slight miss under load at lower RPM in 5th and 6th gears, runs great in normal driving. Don't know if they are related or not, but both issues started at the same time. Any ideas?

TIA

Ron

Jan 19, 2024 | 07:44 AM

sonicss33

Drifting

Joined: Jul 2019

Posts: 1,902

Likes: 845

From: FL Keys

2025 C5 of the Year Finalist - Unmodified

You are not alone, my ‘98 Vert has done the same thing you described a couple of times in the past few years. I just get a confused look on my face and drive on. Never put any effort in searching for the cause. I’ll follow this thread now.

Jan 19, 2024 | 11:29 AM

rrwirsi

Melting Slicks

Joined: Nov 2014

Posts: 3,399

Likes: 1,338

From: Havre de Grace Maryland

Hey guys, maybe it is the Florida weather influence.

Jan 19, 2024 | 12:05 PM

grinder11

Race Director

Joined: Oct 2004

Posts: 12,795

Likes: 4,614

Quote:

Originally Posted by rrwirsi

Hey guys, maybe it is the Florida weather influence.

It's too cold in most of Florida this winter to hurt electronics in anything!!

Plenty humid, though....

Jan 22, 2024 | 02:11 PM

3sACROWD

Melting Slicks

Joined: Sep 2011

Posts: 2,256

Likes: 543

From: Appleton WI

You should have your battery load tested. Even a new battery can fail. If all good there, you may have a higher than normal parasitic draw when shut down.

Jan 22, 2024 | 04:04 PM

jfigus

Instructor

Joined: Oct 2021

Posts: 180

Likes: 42

From: Raleigh

Quote:

Originally Posted by Ron C!

I wonder if there's a miniature battery built into the PCM circuit board that keeps the NVRAM alive during power outages. If so, that battery on the circuit board could be toast.

Jan 22, 2024 | 04:38 PM

Tron Z

Pro

Joined: Aug 2010

Posts: 622

Likes: 169

From: Montgomery Texas

Could be a battery issue; it should be checked.
More likely would be the grounds. If you haven't disassembled, inspected, cleaned and secured the nine main chassis grounds in the past few years, I'd start there.

Jan 22, 2024 | 06:39 PM

grinder11

Race Director

Joined: Oct 2004

Posts: 12,795

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Quote:

Originally Posted by jfigus

I wonder if there's a miniature battery built into the PCM circuit board that keeps the NVRAM alive during power outages. If so, that battery on the circuit board could be toast.

I've been wrong before, but in my near 20 years here I have never heard of any battery except the one under the hood.......

Last edited by grinder11; Jan 23, 2024 at 06:46 AM.