2020–2024 Cadillac CT4-V
By Tom Becker ✓ Certified Mechanic · Published Sep 21, 2026 · Updated Oct 22, 2026
Save $120 by doing it yourself! Shop cost: $300
Quick answer: 12V Battery Replacement on a 2020–2024 Cadillac CT4-V is rated Easy and takes about 30-90 minutes. You'll need 3 tools for this job, and parts cost about $180. This guide walks you through the full job step by step, including the mistakes to avoid.
| Part Name | Part Number | Price | Buy |
|---|---|---|---|
| Replacement 12-volt battery for 2020-2024 Cadillac CT4-V; verify group size, CCA, terminal layout, and VIN fitment | — | $180.00 | |
| Anti-corrosion terminal protectant or felt washers (optional) Optional | — | $8.00 |
About prices: shown prices are typical retail averages and change frequently; cheaper alternatives may be available. Confirm the current price before buying.
💡 Pro tip: Order all parts at once to save on shipping
Follow these steps carefully
The CT4-V keeps its battery in the trunk under the load floor: Group 94R/H7 AGM, around 800 CCA. Buy an AGM with a vent connection and route the vent tube outside.
Park level, Park, parking brake set, ignition off. Disconnecting clears the clock, radio presets, and some driver settings. Gather a 10mm socket, gloves, and eye protection, and keep sparks and open flame away from the battery.
Lift the trunk load floor and remove the trim or access panel to expose the battery well. Photograph the cable routing and vent tube before touching anything. Note the battery current sensor on the negative cable and handle it gently.
Loosen the negative clamp first and tuck it aside without stressing the sensor wiring. Disconnect the vent tube, remove the hold-down, then the positive cable. Lift the Group 94R/H7 AGM battery out — over 50 pounds, so lift with your legs.
Battery jobs have bitten me before: Don't stress that current sensor's wiring when you move the negative cable aside — the sensor is how the car tracks battery health, and a damaged wire gives you phantom electrical complaints for months.
Lower the new Group 94R/H7 AGM battery into the well. Refit the hold-down until it can't shift. Reconnect the vent tube so gases route outside the car. Connect positive first, then negative, seating the sensor as before, both clamps gripping.
No scan-tool registration is needed on the CT4-V; the current sensor relearns the new battery over a few drive cycles. If your manual specifies otherwise, follow it. Reset the clock and radio presets. Cycle each window fully so one-touch relearns.
Start the CT4-V — quick, strong cranking. Idling, you should see roughly 13.5 to 14.5 volts across the terminals and no battery warning light. Run headlights and blower to confirm steady behavior. Return the old battery for recycling.
Test your repair before closing everything up. If something doesn't work right, double-check your steps.
⚠️ Common Mistakes to Avoid
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