I’ve been having some serious issues with my 2009 LMM. These are the DTC’s that have been coming up and the rundown of whats been going on. I would really appreciate some knowledgeable input on where to look because I’ve spent the better part of the last 3 months tracing wires and checking voltages and I’m at a complete loss as to where to go from here.
P0117- Engine coolant temperature (ECT) sensor low voltage
P0522- Engine oil pressure sensor low voltage
P0462- Fuel level sensor circuit low voltage
P0652- Sensor reference voltage B circuit low voltage
It’s only throwing these codes once i put the truck in gear (park or reverse). It was doing it in park once the truck warmed up, but now is mainly just doing it when put in gear. When i start it up and keep it in park, it runs great with no dtc’s, but as soon as i put it in gear, the fuel, oil pressure, and temp gauges go all over the place with no consistancy to what they read. Lately, the fuel gauge has been reading accurate when i turn the truck on but shortly after falls to empty. As soon as i put it in gear, the truck sputters and knocks and the actual rail pressure at idle drops to around 1000psi, spikes to 29000psi, and goes all over the place in between while the commanded pressure is around 4200psi. The message center also displays the following messages when this happens:
-Service traction control
-Service stabilitrac
-Engine too hot, idle engine now
-Engine too hot, turn off engine now
I know the engine is not overheating, so i know it’s electrical somewhere. I’ve found a few nicked wires on the bale connectors so i stripped off the sheathing on the harnesses and have repaired everything i found and replaced with new sheathing. Ive tried moving/pulling on all the wires/connectors with the truck running, both while cold and hot, with no changes to how it runs. I initially thought it could have been bad fuel, so i ran the tank down, filled up with new fuel and changed the filters on my lift pump (filter head has been deleted). The whole time i ran it, as soon as i put the truck in gear, it would sputter and knock and did the same while driving. The weird thing is that it runs perfectly when in park (i can run it to the rev limiter and it’s smooth as butter). Ive checked the voltage to all the sensors and they all checked out good both while hot and cold. Desired vs actual FRP is good and everything else seems to be fine until i put it into gear (as soon as i do, actual FRP is all over the place). I’ve read that the CTS2 can cause a short on the can bus so i tried disconnecting it, but it did not make any difference. I need to get this thing back on the road again. I would very much appreciate any input on what could be going on.
Whats done to the truck:
-EFILive with DSP5 by Ridge Runner
-Full EGR and DPF delete
-Intake heater delete
-4” Intake with S&B turbo mouthpiece
-Air Dog 165 lift pump with filter head delete
-5” Straight pipe Exhaust
-Mishimoto hot side intercooler pipe
-Cts2 w/ egt probe
-New batteries
-New ECM
-New TCM
-New transmission wiring harness
-New FPR
-New Engine coolant sensor
P0117- Engine coolant temperature (ECT) sensor low voltage
P0522- Engine oil pressure sensor low voltage
P0462- Fuel level sensor circuit low voltage
P0652- Sensor reference voltage B circuit low voltage
It’s only throwing these codes once i put the truck in gear (park or reverse). It was doing it in park once the truck warmed up, but now is mainly just doing it when put in gear. When i start it up and keep it in park, it runs great with no dtc’s, but as soon as i put it in gear, the fuel, oil pressure, and temp gauges go all over the place with no consistancy to what they read. Lately, the fuel gauge has been reading accurate when i turn the truck on but shortly after falls to empty. As soon as i put it in gear, the truck sputters and knocks and the actual rail pressure at idle drops to around 1000psi, spikes to 29000psi, and goes all over the place in between while the commanded pressure is around 4200psi. The message center also displays the following messages when this happens:
-Service traction control
-Service stabilitrac
-Engine too hot, idle engine now
-Engine too hot, turn off engine now
I know the engine is not overheating, so i know it’s electrical somewhere. I’ve found a few nicked wires on the bale connectors so i stripped off the sheathing on the harnesses and have repaired everything i found and replaced with new sheathing. Ive tried moving/pulling on all the wires/connectors with the truck running, both while cold and hot, with no changes to how it runs. I initially thought it could have been bad fuel, so i ran the tank down, filled up with new fuel and changed the filters on my lift pump (filter head has been deleted). The whole time i ran it, as soon as i put the truck in gear, it would sputter and knock and did the same while driving. The weird thing is that it runs perfectly when in park (i can run it to the rev limiter and it’s smooth as butter). Ive checked the voltage to all the sensors and they all checked out good both while hot and cold. Desired vs actual FRP is good and everything else seems to be fine until i put it into gear (as soon as i do, actual FRP is all over the place). I’ve read that the CTS2 can cause a short on the can bus so i tried disconnecting it, but it did not make any difference. I need to get this thing back on the road again. I would very much appreciate any input on what could be going on.
Whats done to the truck:
-EFILive with DSP5 by Ridge Runner
-Full EGR and DPF delete
-Intake heater delete
-4” Intake with S&B turbo mouthpiece
-Air Dog 165 lift pump with filter head delete
-5” Straight pipe Exhaust
-Mishimoto hot side intercooler pipe
-Cts2 w/ egt probe
-New batteries
-New ECM
-New TCM
-New transmission wiring harness
-New FPR
-New Engine coolant sensor
