Ford Super Duty (1999-2016) :: Code P1633 - No Power To Keep Alive Memory


Jan 6, 2014

2000 F250 4x4 V10... I am getting code P1633, no power to Keep Alive Memory

Here are the symptoms...

First, the voltmeter shows under 10 volts. When this happens, the check engine light comes on and throws code P1633.

Also, I can't shift out of park for some reason when the voltmeter shows under 10 volts.

Also, when I apply the brake, the voltmeter drops completely, no other functions seem to affect it other than applying the brake. I know this is related to the shift interlock which could have something to do with not sensing the brake is applied and won't come out of park.

What I've checked so far:

Battery has good voltage
Alternator is charging
Fuse to PCM shows good voltage
Fuses to voltmeter and shift interlock show good voltage
All grounds I've found are good

The one problem I have found is there is no power to pin 55 to PCM, Keep alive power circuit.

So, I am trying to figure out where the voltmeter gets it's signal from after the fuse box under the dash or where it is grounded, I found the shift interlock ground and it is good.

Would the fact that there is no power to pin 55 cause the voltmeter problem and shift interlock problem? I am tempted to jump power to that pin, but this will not be easy and I don't want to do it if it will just mask the real problem.

Also, when I was first experiencing this problem, the voltmeter would jump around when going over bumps while driving, then it would finally settle under 10 volts. At one time I couldn't drive the truck and kept turning it off then on in hopes it would go back to normal, I applied the parking brake then released it and let it slam up, after that it went back to normal, not sure if the jolt make a connection or what, but I would lean towards a loose connection because of the jumping around of the gauge. Now it's constant though, I messed with a ton of wiring and can't get it to go back to normal. Is there another module that has to do with any of these functions or anything that ties them all together that I am missing?

I am at a loss. I am hoping there are no drive ability issues with this problem, I'll be going on a camping trip in a couple weeks and doubt I'll have it fixed by then. I figured out how to get it out of park bypassing the shift interlock, so that's not a problem.

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