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⚡ Unlock your engine’s full potential—no compromises, just pure power.
The Range Technology RA003B AFM/DFM Disabler is a plug-and-play device designed for V6 and V8 GM vehicles that disables Active and Dynamic Fuel Management systems, ensuring your engine runs in full cylinder mode 100% of the time. It requires no ECU reprogramming, leaves no trace when unplugged, and fits all GM cars, trucks, and SUVs equipped with AFM/DFM, delivering consistent power and control with effortless installation.
| ASIN | B084X5V8RR |
| Automotive Fit Type | Vehicle Specific Fit |
| Brand | Range Technology |
| Brand Name | Range Technology |
| Customer Reviews | 4.4 out of 5 stars 2,263 Reviews |
| Global Trade Identification Number | 00860001618600 |
| Included Components | Main component only |
| Item Weight | 1.92 ounces |
| Manufacturer | RANGE TECHNOLOGY |
| Manufacturer Part Number | RA003B |
| Model Number | RA003B |
| Operating System | All |
| Power Source | Corded Electric |
| UPC | 860001618600 728505768859 |
| Unit Count | 1 Count |
G**Y
Does what it's supposed to but not perfect.
2018 gmc Sierra with eassist. If you want something that you plug in and basically forget about, this works like it's supposed to. However it's not perfect. It does turn off the auto stop and the DOD. When slowing down and coming to a stop, the transmission sometimes studders (best word i can describe it). If you don't mind a few extra seconds (without the Range device) put the transmission in L and select the highest gear available. This keeps the auto stop off and it stays in v8 all the time. The truck will drive normally.
N**A
Does what it says.
I almost never write reviews but this thing legit works. It never goes back into V4 mode. It stays in V8 and my car is a 2SS 1LE. 2022. So it pops even more cause it’s pure V8. Literally goes on for like 6 seconds straight after flooring it. It’s crazy how a simple plug in can change so much. That’s another thing, it was very very easy to install. You just plug it in. That’s it. No setting, no nothing to adjust
M**X
Works as advertised, no regrets on this purchase.
This has been working as advertised since I installed it on my 2017 5.3L Silverado in October of 2025. No more dropping to 4 cylinders. AFM is gone. This is not my everyday driver, but I leave it plugged in all the time. No issue with battery drain. I drive this maybe 2 times per month. No adverse side effects, no surprises. I purchased another one for my 6.2L in my Camaro 2SS. Very impressed , no regrets, cheaper than a hard AFM delete or expensive repairs because my engine is stuck in 4 cylinder mode. GM really screwed up on this feature. Thank you Range Technology!
L**R
Works as intended
So far it seems to be working correctly. Easy to use and easy to connect.
M**2
Works great!
Works great, no issues. No more auto start/stop, stays in V6 mode as it should
J**E
Not bad
Works great, but the super chip is not much more money
B**S
Work good
Works as it should stays in V8 mode all the time only been in truck for a week looks good. For the 2009 Chevy 5.3 runs good no more 4 cylinder mode foolishness. Would recommend so far.
B**E
Range Technology AFM / 5.3L Tahoe with the heavy-duty towing package
Purchased this Range Technology AFM disabler for a Tahoe with 5.3L V8. My Tahoe would drop into the 4 Cylinder mode often, very annoying. I have never gotten used to the hesitation when the engine shifts back into the V8 mode in response to my attempt to accelerate, especially from a dead stop. When driving in normal traffic situations the 5.3L FMS constantly put the engine in and out of V8 to V4 and back distracting from the driving experience. Freeway driving was another area where the 5.3L FMS would drop the engine into V4 when my foot came off the pedal or while coasting which is especially annoying while towing a 6500 lbs. RV or when attempting to pass another vehicle. Installing the Range Technology Disabler has solved these problems and I have noticed the vehicle drives much smother. Yes, it cost more than the knockoffs, but I believe it's worth it. My first AFM disabler was a top-rated knockoff brand, cheaper for sure, but I found it didn't work as I thought it should have, it kept the Tahoe's 5.3L in V8 mode but something was missing, it wasn't smooth running like I experience with Range Technology FMS disabler also there was no way to see the lights on the disabler as they were partially covered with the wrap. Remember the old saying "You Only Get What You Pay For" applies here. I am pleasantly surprised with the build quality, ease of installation and the function of the Range Technology device. Only thing I don't like, nothing in the instructions give you a clear understanding of what ALL the light functions indicates but you can go to Range Technology's web site. Also, I have had no issues with the truck's battery SOC and I have seen a slight increase in fuel economy. I do recommend this device.
J**A
GMC Denali 2018
Works as described in listing.
M**Y
Bueno
Cumple con lo que promete, mejora el funcionamiento. El paquete llegó abierto sin embargo funciona, solo tengo dudas, no especifican si tiene garantía
F**R
Expensive, but does its Job
Works as intended, using it in a 2018 Camaro SS
P**L
Range RA003B, excellent product
I am in Australia. Ordered through Amazon. I read as many reviews I could find. Used in the Chev 1500 Silverado for a week or so and found it to be as advertised. Can't fault it at this time.
M**E
Que funcione, o al menos saber que funciona o tiene algún beneficio
Menciona que evitará que el motor del vehículo se pare en los altos, pero continúa apagándose, no sé si la verdad funciona o no, no veo ningún cambio en el ruido del motor, o no sirve, o está defectuoso o no es compatible, lo usaré un tiempo y si no veo ningún beneficio lo regresaré
Trustpilot
1 month ago
1 month ago