Ford F350 TSB: P1633 KAM Voltage Too Low From Bad Battery Terminal

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Ford F350 TSB: P1633 KAM Voltage Too Low From Bad Battery Terminal

Faulty battery terminals aren't always easy to spot with a visual inspection. Follow this Real Fix to see how a bad battery terminal causes a P1633 code.

Andrew Markel
By Andrew Markel
Andrew Markel is the director of content for Underhood Service magazine. He has been with Babcox Media for 20 years. He is a technician and former service writer and holds several automotive certifications from ASE and ­aftermarket manufacturers.
Published:

Faulty battery terminals aren’t always easy to spot with a visual inspection. Follow this Real Fix to see how a bad battery terminal causes a P1633 code.

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Model 

2000 Ford Pickup F350 Super Duty 6.8L

Complaint

The customer states the check engine light is on.

Cause

Connected a scan tool and found code P1633 – KAM Voltage Too Low. Performed a visual inspection of the battery power wiring harness and battery cable terminals and detected no obvious faults. Used a scan tool to observe the Parameter Identification Keep Alive Power (PID_KAPWR). Wiggle tested the battery cables to simulate road shock and found KAPWR varied as the positive battery cable was wiggled at the battery cable terminal. The results of these tests indicated the battery cable terminal was faulty.

Correction

Replaced the battery cable terminal, cleared codes, performed a road test and verified the vehicle operated properly. The check engine light did not illuminate and no fault codes returned.

Courtesy of Mitchell 1 SureTrack Real Fixes.

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