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Quick answer
For most heavy-duty diesel pickups (6.6L Duramax, 6.7L Cummins or Power Stroke), pick a pack whose maker rates it for at least an 8.0L diesel. The NOCO Boost X GBX155 (rated to 8.0L diesel) is our top pick. The GOOLOO GT4000S is the lower-cost alternative. Mid-size diesels up to 6.0L can use the smaller NOCO GB70.
Diesels are hard to jump. They have high compression, often two batteries, and cold-weather glow-plug or grid-heater loads. A pack that easily starts a 2.0L sedan can fail to turn over a 6.7L Cummins on a 10°F morning. The useful number on the box isn't peak amps. It's the engine rating the manufacturer publishes for diesel.
Quick comparison (specs from manufacturer/Amazon listings; no prices shown)
We compared the published specs on each product's Amazon.com listing (checked 15 November 2026). We also looked at independent test write-ups such as Project Farm's 13-unit jump starter test. We didn't test these packs ourselves. Read how we research.
Best overall for heavy-duty diesels
NOCO Boost X GBX155 (4250A)
Best for: Heavy-duty diesel pickups (6.6L/6.7L) up to 8.0L
Peak current4,250A
Engine ratingUp to 10.0L gas / 8.0L diesel
Starts per chargeUp to 18
RechargeAbout 2.7 hours via USB-C PD; 5 minutes for one emergency start
USB-C output60W, two-way
Flashlight500 lumens, 7 modes
Warranty1 year
Things to know
The most expensive pick in its group
No air compressor
Specs: Amazon.com listing (checked 15 November 2026). ASIN B08WZFPXFM.
3.0L or more (GB40 at its limit; GB70 has headroom)
Mid-size diesel (Colorado/Canyon 2.8 Duramax)
2.8L
3.0L or more
Heavy-duty (6.6L Duramax, 6.7L Cummins, 6.7L Power Stroke)
6.6–6.7L
8.0L or more (GBX155, GT4000S)
7.3L gas or diesel work trucks
7.3L
8.0L or more
Truck engine sizes are general; check your owner's manual or the badge on your truck.
Why "peak amps" can mislead
Brands don't measure peak amps the same way. A 6,000A claim from one maker isn't necessarily stronger than a 4,000A pack from another. That's why we put the maker's diesel engine rating first and treat very high amp claims with caution. Independent tests regularly find advertised figures don't line up with real cranking power (Project Farm).
Cold-weather tips for diesel owners
Keep the pack in the cab, not the bed. Lithium cells deliver less current when frozen.
Wait for the glow-plug or grid-heater light to go out before you crank.
Crank in short bursts and rest between attempts so the pack doesn't overheat.
Recharge every 3 months in storage. GOOLOO and JOLTEKON both recommend this on their listings.
Dual-battery trucks: connect to the battery your owner's manual names for jump-starting, or to the remote jump posts if your truck has them.
FAQ
Can a 2000A jump starter start a 6.7L Cummins?
Usually not reliably. The NOCO GB70 is a 2000A pack, and NOCO rates it for diesel engines up to 6.0L. For a 6.7L, choose a pack rated for at least an 8.0L diesel, such as the NOCO GBX155.
Is a lithium or lead-acid jump starter better for diesels?
Lithium packs are lighter and hold a charge for months. Lead-acid packs like the Clore JNC660 are heavier but common in shops and fleets. Either works if its rating covers your engine. Lithium packs should be kept warm in very cold weather.
Do I need to connect to both batteries on a dual-battery diesel?
Follow your owner's manual. Many trucks have a battery or remote jump post that's designated for jump-starting.
How often should I recharge a jump starter I keep in the truck?
Every 2–3 months in storage is a common maker recommendation, and after every use.