12.7 jakes in 2012 glider kit

when my speed sensor went out same thing happened with the jake, but also my cruise and speedo where visibly acting up. your 2012 should still have a warranty on the truck?

 

You might have a bad connection.

I had a similar problem on my cat c-15. I would cut in and out on the medium and high settings. It was a broken wire on the engine.

 

i agree with lone ranger sounds like the harness under valve cover is bad if its only doing it on low setting pretty common on older engines if it wasnt replaced during rebuild . although on a glider it could be other areas i suppose depending on how good wiring to mate older engine to chassis was done

 

It will come up with a 31 code depending whether it,s a short to ground or an open - check sensor harness at ecm plug right on the bend were the conduit stops and look at the red and orange wire in the lower section ( conduit with age loses it,s clip and rubs through jake wire )

 

If any of these codes are shown, please contact the nearest Detroit Diesel service center.
[TABLE="class: presentation"]
[TR]
[TH]Flash Code[/TH]
[TH]Description[/TH]
[/TR]
[TR]
[TD]11[/TD]
[TD]VSG Sensor Input Voltage Low[/TD]
[/TR]
[TR]
[TD]12[/TD]
[TD]VSG Sensor Input Voltage High[/TD]
[/TR]
[TR]
[TD]13[/TD]
[TD]Coolant level Sensor (CLS) Voltage Low[/TD]
[/TR]
[TR]
[TD]14[/TD]
[TD]Oil or Coolant Temperature Sensor (OTS or CTS) Voltage High[/TD]
[/TR]
[TR]
[TD]15[/TD]
[TD]Oil or Coolant Temperature Sensor (OTS or CTS) Voltage Low[/TD]
[/TR]
[TR]
[TD]16[/TD]
[TD]Coolant Level Sensor (CLS) Voltage High[/TD]
[/TR]
[TR]
[TD]17[/TD]
[TD]Bypass or Throttle, Valve Position Sensor Input Voltage High[/TD]
[/TR]
[TR]
[TD]18[/TD]
[TD]Bypass or Throttle, Valve Position Sensor Input Voltage Low[/TD]
[/TR]
[TR]
[TD]21[/TD]
[TD]Throttle Position Sensor (TPS) Voltage High[/TD]
[/TR]
[TR]
[TD]22[/TD]
[TD]Throttle Position Sensor (TPS) Voltage Low[/TD]
[/TR]
[TR]
[TD]23[/TD]
[TD]Fuel Temperature Sensor (FTS) Voltage High[/TD]
[/TR]
[TR]
[TD]24[/TD]
[TD]Fuel Temperature Sensor (FTS) Voltage Low[/TD]
[/TR]
[TR]
[TD]25[/TD]
[TD]No Codes[/TD]
[/TR]
[TR]
[TD]26[/TD]
[TD]Auxiliary Engine Shutdown #1 or #2 Input Active[/TD]
[/TR]
[TR]
[TD]27[/TD]
[TD]Air Inlet or Intake Air, Temperature Sensor Input Volage High[/TD]
[/TR]
[TR]
[TD]28[/TD]
[TD]Air Inlet or Intake Air, Temperature Sensor Input Volage Low[/TD]
[/TR]
[TR]
[TD]31[/TD]
[TD]Engine Brake Output Open Circuit or Short to Ground[/TD]
[/TR]
[TR]
[TD]32[/TD]
[TD]CEL or SEL Short to Battery or Open Circuit[/TD]
[/TR]
[TR]
[TD]33[/TD]
[TD]Turbo Boost Sensor (TBS) Voltage High[/TD]
[/TR]
[TR]
[TD]34[/TD]
[TD]Turbo Boost Sensor (TBS) Voltage Low[/TD]
[/TR]
[TR]
[TD]35[/TD]
[TD]Oil Pressure Sensor (OPS) Voltage High[/TD]
[/TR]
[TR]
[TD]36[/TD]
[TD]Oil Pressure Sensor (OPS) Voltage Low[/TD]
[/TR]
[TR]
[TD]37[/TD]
[TD]Fuel Pressure Sensor (FPS) Voltage High[/TD]
[/TR]
[TR]
[TD]38[/TD]
[TD]Fuel Pressure Sensor (FPS) Voltage Low[/TD]
[/TR]
[TR]
[TD]41[/TD]
[TD]Timing Reference Sensor (TRS)[/TD]
[/TR]
[TR]
[TD]42[/TD]
[TD]Synchronous Reference Sensor (SRS)[/TD]
[/TR]
[TR]
[TD]43[/TD]
[TD]Low Coolant[/TD]
[/TR]
[TR]
[TD]44[/TD]
[TD]Oil or Coolant High Temperature[/TD]
[/TR]
[TR]
[TD]45[/TD]
[TD]Low Oil Pressure[/TD]
[/TR]
[TR]
[TD]46[/TD]
[TD]Low Battery Voltage[/TD]
[/TR]
[TR]
[TD]47[/TD]
[TD]Fuel, Air Inlet, or Turbo Boost Pressure High[/TD]
[/TR]
[TR]
[TD]48[/TD]
[TD]Fuel or Air Inlet Pressure Low[/TD]
[/TR]
[TR]
[TD]51[/TD]
[TD]EEPROM Error[/TD]
[/TR]
[TR]
[TD]52[/TD]
[TD]ECM - Analog to Digital Failure[/TD]
[/TR]
[TR]
[TD]53[/TD]
[TD]EEPROM Non-Volatile Memory Failure[/TD]
[/TR]
[TR]
[TD]54[/TD]
[TD]Vehicle Speed Sensor Fault[/TD]
[/TR]
[TR]
[TD]55[/TD]
[TD]J1939 Data Link Failure[/TD]
[/TR]
[TR]
[TD]56[/TD]
[TD]J1587 Data Link Failure[/TD]
[/TR]
[TR]
[TD]57[/TD]
[TD]J1922 Data Link Failure[/TD]
[/TR]
[TR]
[TD]61[/TD]
[TD]Injector Response Time Too Long[/TD]
[/TR]
[TR]
[TD]62[/TD]
[TD]Auxiliary Output Short ot Battery or Open Circuit or Mech Fault[/TD]
[/TR]
[TR]
[TD]63[/TD]
[TD]PWM Drive Short to Battery or Open Circuit[/TD]
[/TR]
[TR]
[TD]64[/TD]
[TD]Turbo Speed Sensor Input Fault[/TD]
[/TR]
[TR]
[TD]65[/TD]
[TD]Throttle Valve Position Input Fault[/TD]
[/TR]
[TR]
[TD]66[/TD]
[TD]Engine Knock Sensor Input Fault[/TD]
[/TR]
[TR]
[TD]67[/TD]
[TD]Coolant or Air Inlet Pressure Sensor Input Voltage High[/TD]
[/TR]
[TR]
[TD]68[/TD]
[TD]Idle Validation Switch Open Circuit or Short to Ground[/TD]
[/TR]
[TR]
[TD]71[/TD]
[TD]Injector Response Time Too Short[/TD]
[/TR]
[TR]
[TD]72[/TD]
[TD]Vehicle Overspeed[/TD]
[/TR]
[TR]
[TD]73[/TD]
[TD]Gas Valve Position Input Fault or ESS Fault[/TD]
[/TR]
[TR]
[TD]74[/TD]
[TD]Optimized Idle Safety Look Short to Ground[/TD]
[/TR]
[TR]
[TD]75[/TD]
[TD]ECM Battery Voltage High[/TD]
[/TR]
[TR]
[TD]76[/TD]
[TD]Engine Overspeed with Engine Brake[/TD]
[/TR]
[TR]
[TD]77[/TD]
[TD]Fuel Temperature High[/TD]
[/TR]
[TR]
[TD]81[/TD]
[TD]Dual Fuel BOI or Exhaust Temperature Voltage High[/TD]
[/TR]
[TR]
[TD]82[/TD]
[TD]Dual Fuel BOI or Exhaust Temperature Voltage Low[/TD]
[/TR]
[TR]
[TD]83[/TD]
[TD]Exhaust Temperature or External Pump Pressure High[/TD]
[/TR]
[TR]
[TD]85[/TD]
[TD]Engine Overspeed[/TD]
[/TR]
[TR]
[TD]86[/TD]
[TD]External Pump Pressure Sensor Input Voltage High[/TD]
[/TR]
[TR]
[TD]87[/TD]
[TD]External Pump Pressure Sensor Input Voltage Low[/TD]
[/TR]
[/TABLE]

 

there is the code list now the jakes have to plugs on IV one plug at the ecm and one just under the intake manifold. either could be bad. also s60 12.7 are known for bad head harnesses. good news is they are simple to change bad news you have to pull vavle cover and jakes. the harness runs both jakes and injectors. it could also be you have a broken jake wire under the pan and it is grounding out to the motor. just had to fix that on mine......