Attention: TDR Forum Junkies 
CharlesHoward
TDR MEMBER
Back in 2019 BD promoted their "Iron Horn" Turbo upgrades (Turbo (no waste gate) & Exhaust Manifold)..
Installed BD Iron Horn 5.9L Cummins Turbo Kit S36SXE/76 0.9AR-03-07 Dodge Cummins 5.9L Item No: BDD1045170 (Flow 77lb Min - #2 of 5 in their hierarchy of performance - with a towing & gauge symbol) from Thoroughbred Diesel in July 2019. Mileage 167940. Also installed Mr Bob's Hoses and the BD Intake Manifold.
Around 173 K Miles (Sept 2021 – 5000 Miles & 2 years later) we were stuck in a long Interstate HWY Traffic Jam with some Engine turnoffs and lots of Starts creeps and stops which triggered a CEL PO299 Generic Low Boost Code and poor performance pulling my 14K Fifth Wheel. Diesel Shop in TN could find no issues and cleared the Code. Trip was from Cedar Rapids Iowa to home in AL.
Towed my Fiver successfully uphill from Alabama to Imperial Nebraska in early June this year (1300 miles).
In the last few months, I've encountered BAD low speed bumps twice (NOT towing) and got the PO 299 Code which my cheap Scan Tool claims it clears but the Check Engine Light stays on BUT the CEL goes away later "on its own" - Mileage 176K
Took my RAM to the local Auto Shop on July 11 to have the MAP Sensor changed thinking that was most likely the problem. MAP Sensor was replaced.
Subsequently some more low speed bumps led to a new CEL PO 236 Turbo/Supercharger Boost Sensor A Circuit Range / Performance. My Scan Tool claims to erase but doesn’t. On July 29 the Auto Shop cleared the code with the note: “MAP Sensor too high too long”.
CEL PO 236 returned the next day. Current Mileage is 177K.
My OBD Boost Gauge APP shows 7-9 PSI driving slowly/idling around town but 25 PSI accelerating to 55 mph (fastest I can go in this small town!) so the Turbo is performing fine (?)
I contacted BD Diesel and they responded:
“The turbo that you installed is considered a performance upgrade. It is larger and will flow more than the stock turbo did. Your computer expects to see a certain amount of boost at a certain speed with a certain throttle input. With the bigger turbo its going to be running less boost until it sees enough fueling to spool it up. Because of this at slow speeds from time to time it will throw that code. If you installed a performance tune into the truck giving it a little more fueling and injection timing in most cases these go away. “
My questions are:
Is there some other Turbo sensor that needs to be checked?
Maybe the NEW MAP is bad?
Is there likely a bad wire/connector/electrical problem?
Is a Tuner really needed?
Thanks for any advice!
Installed BD Iron Horn 5.9L Cummins Turbo Kit S36SXE/76 0.9AR-03-07 Dodge Cummins 5.9L Item No: BDD1045170 (Flow 77lb Min - #2 of 5 in their hierarchy of performance - with a towing & gauge symbol) from Thoroughbred Diesel in July 2019. Mileage 167940. Also installed Mr Bob's Hoses and the BD Intake Manifold.
Around 173 K Miles (Sept 2021 – 5000 Miles & 2 years later) we were stuck in a long Interstate HWY Traffic Jam with some Engine turnoffs and lots of Starts creeps and stops which triggered a CEL PO299 Generic Low Boost Code and poor performance pulling my 14K Fifth Wheel. Diesel Shop in TN could find no issues and cleared the Code. Trip was from Cedar Rapids Iowa to home in AL.
Towed my Fiver successfully uphill from Alabama to Imperial Nebraska in early June this year (1300 miles).
In the last few months, I've encountered BAD low speed bumps twice (NOT towing) and got the PO 299 Code which my cheap Scan Tool claims it clears but the Check Engine Light stays on BUT the CEL goes away later "on its own" - Mileage 176K
Took my RAM to the local Auto Shop on July 11 to have the MAP Sensor changed thinking that was most likely the problem. MAP Sensor was replaced.
Subsequently some more low speed bumps led to a new CEL PO 236 Turbo/Supercharger Boost Sensor A Circuit Range / Performance. My Scan Tool claims to erase but doesn’t. On July 29 the Auto Shop cleared the code with the note: “MAP Sensor too high too long”.
CEL PO 236 returned the next day. Current Mileage is 177K.
My OBD Boost Gauge APP shows 7-9 PSI driving slowly/idling around town but 25 PSI accelerating to 55 mph (fastest I can go in this small town!) so the Turbo is performing fine (?)
I contacted BD Diesel and they responded:
“The turbo that you installed is considered a performance upgrade. It is larger and will flow more than the stock turbo did. Your computer expects to see a certain amount of boost at a certain speed with a certain throttle input. With the bigger turbo its going to be running less boost until it sees enough fueling to spool it up. Because of this at slow speeds from time to time it will throw that code. If you installed a performance tune into the truck giving it a little more fueling and injection timing in most cases these go away. “
My questions are:
Is there some other Turbo sensor that needs to be checked?
Maybe the NEW MAP is bad?
Is there likely a bad wire/connector/electrical problem?
Is a Tuner really needed?
Thanks for any advice!
