Battery Flat

[rc8]

Hi, new owner of a 2023 C8. I was away for two months and came back to a flat battery (I think). The car doesn’t start and just displays random errors.

Can it be jump started or will I have to call someone (I bought it from Ian Allen)? Will the trickle charger work?

Thanks in advance for any help.

 

[teamzr1]

The fact the C8 has like 30 controllers that can draw voltage when C8 is parked, it is a must to keep it
on a battery tender to keep the battery at full charge. It has a battery monitor attached to the battery and when charging you must plug any type of charger in the correct location as I show below

Trickle charge is just that, outputs lower voltage so it could be done but would take a lot longer than a full charger


Make sure you attach like this as my drawing shows,
so negative probe on charger attach to ground and not the negative side of battery where positive probe to positive post of battery

More info :

C8 owners find that the battery tender they use does not report the battery is 100% State of Health (SoH) but the State Of Charge (SoC) is 90% and battery voltage around 12.6 volts
Each of the 6 cells of battery puts out 2.2 volts = 12.6 volts so as the remote battery monitor shows 12.6, thus SoH is 72 %

The reason SoH is not 100% is the C8 and other new GM vehicles have a battery monitor module (also needed for the new E-Ray), and it controls the charge to the battery when the charger is hooked up as GM states (shown below)

In short, the monitor is controlling the total charge to the battery to prevent overcharging battery

The electronic battery sensor is an important part of the vehicle energy management.
The sensor informs the car of the exact battery status, measures the temperature and controls the charging voltage and charging current accordingly.

The massively increased on-board currents in current vehicle models, and in particular the micro-hybrid start-stop applications and recovery of braking energy, place new demands on car batteries. Increasingly, kinetic energy is also converted into electrical energy during coasting (= free rolling of the car) and this charges the battery.

Use and function of the sensor

Energy management continuously records parameters such as voltage, current and temperature via a battery sensor.
These measured values are used to calculate important parameters such as state of charge (SOC), state of function starting ability (SOF) and overall condition age of battery (SOH State Of Health) and a variety of other values.

The data are sent to the vehicle computer.
The driver then decides on the energy balance in the vehicle and, if necessary, restricts the use of comfort consumers such as heated seats or air conditioning, switches off the start-stop function and signals this to the driver on the display with the corresponding information.
If the alternator then recharges sufficiently, the control unit automatically reactivates all consumers and functions.

The ultimate goal is to ensure that the engine is started at all times and, in doing so, avoid vehicle failure.
The sensor also supports intelligent alternator control, which reduces CO2 emissions, saves fuel and protects the environment.

 

[teamzr1]

FYI
Some of the controllers

Here are some of them :

1) Battery Control Module
2) Brake Control Module
3) Front Leveling and Hydraulic Control Module
4) Headlamp Control Module (Both Left and Right)
5) Power Steering Control Module
6) Radio Control Module
7) Body Control Module (BCM)
8) CAN Serial Gateway Control Module
9) Restraint Control Module
10) Control Modules within steering wheel
11) Steering Control Module
12) Column Lock Control Module
13) Telematic Communications Control Module
14) Video Processing Module
15) Performance Data Recorder Module (PDR)
16) Audio Amplifier
17) Lighting Control Module
18) Wireless Charging Control Module
19) Instrument Panel Control Module (I.P. Cluster)
20) HVAC Control Module
21) Engine Control Module
22) Chassis/Suspension Control Module
23) Fuel Pump Power Control Module
24) Fuel Pump/Tank Control Module
25) Transmission Control Module
26) Misc. Control Modules

 

[Chevrolet]

Hi, new owner of a 2023 C8. I was away for two months and came back to a flat battery (I think). The car doesn’t start and just displays random errors.

Can it be jump started or will I have to call someone (I bought it from Ian Allen)? Will the trickle charger work?

Thanks in advance for any help.

Hi, Presumably you left it for 2 months without the trickle charger/conditioner attached? I don't have a C8, but had a C7 from Ian Allan, along with several other guys I know. Mine came with the factory option Corvette logo battery conditioner that plugged into a charging point hole in the rear trunk. Presume you have the C8 factory charger from new for your car as below:

I'd plug yours in for a couple of hours to recharge the battery. On the C7, the guys I know, including me, ditched the factory conditioner for a more powerful 8 AMP conditioner that attaches to specific charging connections in the engine.