Diagnostic Aids
WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
- For accurate test results the battery must be disconnected from the vehicle and the equipment connected directly to the battery posts. When setting up the equipment, select "Out of Vehicle" and then the correct battery type (Flooded, AGM, or Stop/Start AGM) and rated CCA (both from the battery label) must be entered.
- Failure to obtain the correct connections during the test may result in a failed test on a good battery.
- For Dual Batteries the battery must be disconnected with test equipment connected directly to the posts. Each battery needs to be tested separately.
NOTE:
For Warranty Repairs - You must use the regionally required battery test equipment.
- For Setup:
- When using the GR8, select "Out of Vehicle" and then the correct battery type (Flooded, AGM, or Stop/Start AGM) and rated CCA (both from the battery label) must be entered. Use the Out of Vehicle test (battery disconnected with test equipment connected directly to the posts) for each battery when testing a vehicle with dual batteries.
- When using the DCBS, scan the VIN and verify the battery selection is correct, or manually select the correct battery type (Flooded or AGM) and rated CCA (both from the battery label).
Cold Battery Testing - Battery Temperature Less Than 0° C (32° F)
- Cold batteries are resistant to charging even when in use on the vehicle. They will not recover quickly in subfreezing temperatures. Releasing a new vehicle with a battery in a low state of charge puts the customer at risk to a no crank event.
- If you suspect that a battery may be frozen, inspect the case for cracks prior to charging. Do not charge a frozen battery.
- When an automotive 12 Volt battery is cold (below freezing), its capacity starts to reduce. This can be observed in the voltage level of the battery, as well as measured cold cranking amps. A cold battery is also resistant to charging. The colder the battery, the more these characteristics are affected.
- Depending how cold a battery is, it can fail testing using any type of battery test equipment.
NOTE: