🔥 Live regen status
Not regenerating, regenerating, ending, or finished. Read from the engine computer every couple of seconds while you drive. Free.
🔔 Alerts with the phone locked
A notification when a regen starts, when it finishes, and when one gets cut short, so you know not to shut the truck off at the fuel pump.
📏 Miles since the last regen
How far you've driven since the last regen, against your truck's own usual interval. You can see the next one coming.
📋 Regen log
Every regen with its length and how it ended: completed, interrupted, or switched off. Regens that happened while the phone wasn't connected are caught from the truck's own counter.
📉 Intervals shrinking?
An interval chart against your truck's average, and a warning when regens keep coming sooner than usual.
🔒 Read-only
Regen Monitor only reads. It never writes to your truck, never clears codes, never forces a regen and doesn't tune or modify anything.
Why it matters
Your diesel particulate filter (DPF) catches soot. Every few hundred miles the truck burns it off by running the filter at around 550–650 °C (1,000–1,200 °F): an active regeneration. A regen that is cut short (you shut the truck off, park, or idle at a drive-through) leaves soot behind. Cut enough of them short and the filter loads up: more regens, worse mileage, and eventually a warning light and a trip to the dealer.
Most of the time the truck doesn't say a regen is running. Owners guess from the signs instead:
- the cooling fan roaring at a stop,
- a higher idle,
- a hot smell from the exhaust,
- instant fuel economy dropping for no reason.
Regen Monitor replaces the guessing with the engine computer's own numbers.
How it works
- Plug in a Bluetooth LE OBD-II adapter under the dash. It must support 29-bit CAN; see the adapter guide.
- Run the free check. The app confirms the adapter reaches your Duramax's engine computer before you pay anything. No adapter yet? Try the demo truck.
- Drive. Watch the status live (free), or unlock alerts, counters and the regen log.
Pay once
The engine check, live regen status and the demo truck are free. Unlock adds alerts with the phone locked, miles since the last regen against your usual interval, completed regens, filter pressure, the regen log and unlimited trucks, for a one-time $14.99. No subscription.
Private by design
Everything stays on your iPhone. No account, no ads, no analytics, no servers. Privacy policy.