2015 2500 6.7 No start/incomplete crank

[rcmedic]

I have a 2015 2500 6.7 turbo with No Start.. Starter is good, batteries are good. Engine tries to crank but doesn't. If I jump directly to solenoid to activate starter it cranks fine. What am I missing? Solenoid activation circuit seems to be the suspect.

 

[Timd32]

Obvious things like clutch safety switch?

Key dead? Do you have a spare to try.

It is fully looks like to be in Park? Not sure if it's mechanical or electronic on that year?

 

[SnoKing]

I have a 2015 2500 6.7 turbo with No Start.. Starter is good, batteries are good. Engine tries to crank but doesn't. If I jump directly to solenoid to activate starter it cranks fine. What am I missing? Solenoid activation circuit seems to be the suspect.

Weak batteries. Computer detects to much voltage drop and aborts start. Pretty common problem. My 2015 3500 HO did it around the 4 year mark.

 

[rcmedic]

Obvious things like clutch safety switch?

Key dead? Do you have a spare to try.

It is fully looks like to be in Park? Not sure if it's mechanical or electronic on that year?

No, none of those suggestions work.

 

[rcmedic]

Weak batteries. Computer detects to much voltage drop and aborts start. Pretty common problem. My 2015 3500 HO did it around the 4 year mark.

No sir. Batteries are good. I can start the vehicle is I jump from battery positive to the solenoid lead.

 

[AH64ID]

No sir. Batteries are good. I can start the vehicle is I jump from battery positive to the solenoid lead.

That doesn’t mean the batteries are good, as you’re bypassing the ECM.

Trying other batteries is cheap.

 

[Timd32]

Most everything starts with the following note.

Makes sense to start with the batteries at some level.

NOTE: The following list of items must be checked before continuing with any no start tests.

1. The Battery must be fully charged and in good condition. A low charged Battery may produce invalid test results. If the Battery is low, charge the Battery and then attempt to start the vehicle by cranking the engine for 15.0 seconds, three consecutive times. This will allow any DTCs to set that may have been erased due to a dead Battery

Then it's a bunch of rabbit holes from there.

Here are some rabbit holes..... I don't really like too many of these as it's not quite what you describe is going on.

One simple thing is to swap that run relay possibly if there are spares, not really liking that either because that's like a no-go-no deal I would think.

 

[rcmedic]

Most everything starts with the following note.

Makes sense to start with the batteries at some level.

NOTE: The following list of items must be checked before continuing with any no start tests.

1. The Battery must be fully charged and in good condition. A low charged Battery may produce invalid test results. If the Battery is low, charge the Battery and then attempt to start the vehicle by cranking the engine for 15.0 seconds, three consecutive times. This will allow any DTCs to set that may have been erased due to a dead Battery

Then it's a bunch of rabbit holes from there.

Here are some rabbit holes..... I don't really like too many of these as it's not quite what you describe is going on.

One simple thing is to swap that run relay possibly if there are spares, not really liking that either because that's like a no-go-no deal I would think.

Thank you. I will give those suggestions a try.

 

[sag2]

Check for high resistance (voltage drop) in all B+ connections, especially crossover cable, PDC connection, and transmission connector.