Does the 2021 Ram 1500 have auto start-stop?
On some configurations. Yes on the 3.6L 6-cylinder hybrid mild hybrid and 5.7L 8-cylinder hybrid mild hybrid. No on the 3.6L 6-cylinder, 5.7L 8-cylinder and 6.2L 8-cylinder supercharged. The 3.0L 6-cylinder turbo diesel is listed both with and without it, depending on the build.
Key takeaways
- Start-stop cars restart the engine many times per drive, so they are usually fitted with an AGM or EFB battery - replace like with like.
- The 3.6L 6-cylinder hybrid mild hybrid and 5.7L 8-cylinder hybrid mild hybrid are a mild hybrid, with a separate higher-voltage battery besides the 12V one.
- Most systems have an off button that disables start-stop until the engine is next started; some models remember the setting.
| Engine | Drive | Transmission | Start-stop |
|---|---|---|---|
| 3.0L 6-cylinder turbo diesel | 4WD | 8-speed automatic | Yes |
| 3.0L 6-cylinder turbo diesel | RWD | 8-speed automatic | Yes |
| 3.0L 6-cylinder turbo diesel | RWD | 8-speed automatic | No |
| 3.6L 6-cylinder hybrid mild hybrid | 4WD | 8-speed automatic | Yes |
| 3.6L 6-cylinder | 4WD | 8-speed automatic | No |
| 3.6L 6-cylinder hybrid mild hybrid | RWD | 8-speed automatic | Yes |
| 3.6L 6-cylinder | RWD | 8-speed automatic | No |
| 5.7L 8-cylinder hybrid mild hybrid | 4WD | 8-speed automatic | Yes |
| 5.7L 8-cylinder | 4WD | 8-speed automatic | No |
| 5.7L 8-cylinder hybrid mild hybrid | RWD | 8-speed automatic | Yes |
| 5.7L 8-cylinder | RWD | 8-speed automatic | No |
| 6.2L 8-cylinder supercharged | 4WD | 8-speed automatic | No |
Source: U.S. EPA / DOE fuel economy data (fueleconomy.gov). Each row is one certified configuration; a trim or option not sold in a configuration is not listed.
2021 Ram 1500 battery size, type and CCA → Some start-stop cars also need the new battery registered: which ones →
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