CEL P1633 - Ford Powerstroke Diesel Forum
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Old 04-01-2014, 09:19 PM
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CEL P1633

I have a CEL that has been on in my truck, everything seems to run fine, no noticable issue. The code is P1633, keep alive voltage too low. I have no idea where to start, asked at autozone, they had no idea, my mech had no idea and I asked a Ford mech he was even unsure. anyone have this happen to them?

It started after my mini maxx was put in my truck, no sure if that changes anything, the light on my dash drives me crazy though. Thank You for any help
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Old 04-03-2014, 02:25 AM
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Quote:
Originally Posted by mtfd49 View Post
I have a CEL that has been on in my truck, everything seems to run fine, no noticable issue. The code is P1633, keep alive voltage too low. I have no idea where to start, asked at autozone, they had no idea, my mech had no idea and I asked a Ford mech he was even unsure. anyone have this happen to them?

It started after my mini maxx was put in my truck, no sure if that changes anything, the light on my dash drives me crazy though. Thank You for any help
Had you been driving right before you installed the MM? Did you clear the code and see if it would come back?
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Old 04-03-2014, 05:40 PM
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I'll share something I looked up on my shop computer:
Tests/Procedures:
1. This code suggests power to the TCM has been interrupted. Since this started with a reprogram, a fuse likely blew during the programming process.

2. Check fuse 37 in the battery junction box under the hood. It is a 10 amp fuse. If it is blown, replace the fuse and retest.

3. If the fuse is not blown, the modules should be programmed again using a factory or equivalent scan tool.

That's what it says to do when the problem occurs following a reflash.

Last edited by highup0; 04-03-2014 at 05:46 PM.
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