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Jeremy, Certified Diesel Technician/Electrician
Category: Ford
Satisfied Customers: 3362
Experience:  ASE, NATEF Engines and Electrical certified, EPA 608/609
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Engine won't start, not getting fuel to start. Scanner

Customer Question

Customer: ***** *****, Engine won't start, not getting fuel to start. Scanner returned Code P1633. 2006 6lt Diesel Ford F350.
JA: Thanks. Can you give me any more details about your issue?
Customer: Engine has lots of fuel, battery has 13.2 V but still won't start. P1633 cannot be erased with the scanner.
JA: OK got it. Last thing — JustAnswer charges a fee (generally around $28) to post your type of question to Ford Experts (you only pay if satisfied). There are a couple customers ahead of you. Are you willing to wait a bit?
Customer: Okay
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Submitted: 1 year ago.
Category: Ford
Expert:  Jeremy replied 1 year ago.

My nae is Jeremy and I will assist you.

That code means the Keep Alive Memory Voltage is Too Low.

The part of the PCM that gets the power to the KAM is below 10.5 volts. There could be a harness issue, battery cable issue, or the PCM itself. Look on the batteries on the passenger side. You will have a small red wire that comes off of it. Check that wire and follow to the fuse link. See if it is tripped. It powers the PCM. With good battery voltage, the harness might be at fault.

Good thing is your PCM is right on top of the engine and pretty easy to access. I would unplug the 3 plugs and check for corrosion and the wires going those plugs. Plug back in and see if the issue remains. If it does, then test the PCM for internal failure.

I wish it was an easy fix for you, but this one doesn't look like it will be.

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Expert:  Jeremy replied 1 year ago.

I see you viewed this and this is still showing as a open question due to no positive (3 stars or more) rating.

Did you still need assistance with this?