Why does my 2019 Isuzu NRR keep entering limp mode?

[TwoMenVA]

I run a small business in the Mid Atlantic and have a few 2019 Isuzu NRR's that keep going derate/falling into crawl mode. It's led to some really expensive towing costs especially when these trucks are on long hauls far away from our shop/trusted mechanics.

Does anyone know if there are preventative methods than can stop our trucks from going derate? My understanding is keeping DEF at proper levels can help and keeping the engine hot when running can too. I'm a total beginner when it comes to knowledge of these trucks and I want to better understand how I can keep them on the road without this happening.

Our current mechanic said an option is to purchase an Isuzu software license and use a USB connector to the OBD-2 port to check the codes and if they aren't anything severe, close the codes to take the truck off limp mode until it's able to drive back home. Is this really my best bet to spend $800 on the connector set up and keep taking it off limp mode as long as it's nothing crazy (like if it's due to a faulty sensor)? Or do I have any other options to lower our maintenance costs with this issue? I have considered preemptively replacing sensors for the DEF system, but that's both expensive, and I'm not entirely convinced there's not a way to detect an issue before I go on a long haul.

 

[BrelanWindmere]

I run a small business in the Mid Atlantic and have a few 2019 Isuzu NRR's that keep going derate/falling into crawl mode. It's led to some really expensive towing costs especially when these trucks are on long hauls far away from our shop/trusted mechanics.

Does anyone know if there are preventative methods than can stop our trucks from going derate? My understanding is keeping DEF at proper levels can help and keeping the engine hot when running can too. I'm a total beginner when it comes to knowledge of these trucks and I want to better understand how I can keep them on the road without this happening.

Our current mechanic said an option is to purchase an Isuzu software license and use a USB connector to the OBD-2 port to check the codes and if they aren't anything severe, close the codes to take the truck off limp mode until it's able to drive back home. Is this really my best bet to spend $800 on the connector set up and keep taking it off limp mode as long as it's nothing crazy (like if it's due to a faulty sensor)? Or do I have any other options to lower our maintenance costs with this issue? I have considered preemptively replacing sensors for the DEF system, but that's both expensive, and I'm not entirely convinced there's not a way to detect an issue before I go on a long haul.

Anyone?

 

[greasytshirt]

I run a small business in the Mid Atlantic and have a few 2019 Isuzu NRR's that keep going derate/falling into crawl mode. It's led to some really expensive towing costs especially when these trucks are on long hauls far away from our shop/trusted mechanics.

Does anyone know if there are preventative methods than can stop our trucks from going derate? My understanding is keeping DEF at proper levels can help and keeping the engine hot when running can too. I'm a total beginner when it comes to knowledge of these trucks and I want to better understand how I can keep them on the road without this happening.

Our current mechanic said an option is to purchase an Isuzu software license and use a USB connector to the OBD-2 port to check the codes and if they aren't anything severe, close the codes to take the truck off limp mode until it's able to drive back home. Is this really my best bet to spend $800 on the connector set up and keep taking it off limp mode as long as it's nothing crazy (like if it's due to a faulty sensor)? Or do I have any other options to lower our maintenance costs with this issue? I have considered preemptively replacing sensors for the DEF system, but that's both expensive, and I'm not entirely convinced there's not a way to detect an issue before I go on a long haul.

Where in VA? My shop is a half hour east of Richmond. We work on Hino and Isuzu trucks.

Having a scan tool is very useful, but deleting codes doesn't help whoever is trying to fix it. At least record them all. And depending on what caused limp mode, the codes may not be clearable, with factory software needed.