So I've recently installed a SCT 1705 programmer on my truck and a week or two after installing it my battery gauge started reading high up around the top of the range but not out of operating range. So I figured it was the alternator so I got a multimeter and tested it. It read from the alternator 14.47 volts DC, from the passenger side battery 12.29, and from the driver side battery around 14.45. So I figured all of this is okay. I wound up running a diagnostic on it and got 2 codes.
P1670- EF Feedback Signal Not Detected
P0603- Internal Control Moduloe KAM error
I have no idea what any of this means or whether it would cause this problem. Anybody had this happen before or know what it is?

 

Oh, and after the engine sits it is real hard to start, almost like a dead battery.

 

I say to disconnect the batteries and load test them. I imagine that the one reading 12.29 is bad and causing the high voltage reading. If they test ok, then it could be voltage regulator in alternator. It could be that anyway and it has overcharged the batteries and killed them at this point.

 

Load test as Carlton said. Then, I would check the connections between the passenger side (PS) battery and the drivers side (DS) battery. You have good voltage on the DS and poor on the PS.

The P0603 error comes up as:

1) open PCM pin
2) disconnect B+
3) faulty PCM

This says to me, unplug the programmer you installed.

Got the P1670 info...

P1670 indicates that a communication error has occurred between PCM and IDM. Possible causes:

open fuse
IDM relay
Open or shorted IDM enable circuit
Open/short in EF circuit
Open/short in FDCS circuit
IDM powering circuits
PCM

This says to me, unplug the programmer you installed. The pinpoint test (w/o a DTC P1668) present sends to a testing routine which would have you disconnect the PCM and the IDM and start measuring resistance on a couple or circuits. Take the programmer out and make sure the PCM is tightly connected.

What are you pulling codes with?

 

You don't think I should run this programmer? I'll check the batteries soon. How do I load test them?

 

It isn't the tuner itself, necessarily. I know nothing about the programmer/tuner you are using. It is the fact that you plugged it into the PCM (via OBD-II) and now problems associated with the PCM are showing up. It is just too suspicious to me that everything points back to the PCM. Load testing will require that you take them to an auto parts shop which can do a load test (or you can buy a load tester and do yourself). What are you using to pull codes?

 

The tuner I have also has a diagnostic code reader. I checked the battery with a multimeter on startup using the min max feature. The passenger side battery dropped to 8.4 volts on startup while the drivers side dropped to 9.46. I read that under 9.4 indicates a bad battery.

 

Get the batteries charged and load tested...my guess is you are going to be buying batteries. Remember, even if one proves good...buy BOTH batteries at the same time. Get 850cca batteries too.

 

Clean your battery cables, especially the passenger side.

The readings you got with the passenger side low indicates that that battery isn't even in the circuit, and isn't being charged or discharged. It may actually be dead by now.

You may have a bad battery cable or just a corroded one, but only a close inspection and cleaning will tell for sure.

Get a cheap battery brush to help with the job.


Pop

 

Yeah Pop, that is why I pointed him towards the connection between the batteries. Glad you pointed specifically to the cables and connections being clean.

 

Thanks guys. I'll check it all out. I would give y'all reps but I guess I need to "spread some reputation around"

 

So, how did this resolve?

Pop

 

Uhuhuhuh, yeah like both of us want to know!

 

(Ahem)

We're still waiting........

Pop

 

Sorry guys, its been a stressful few months and I haven't been able to get on the site in a long time. One of the batteries was bad so I went ahead and purchased both. Everything is perfect now. Thanks guys.