02 workhose 8.1 gas allison 1000 code op0748

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rebuilder67
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02 workhose 8.1 gas allison 1000 code op0748

Post by rebuilder67 » Wed Dec 06, 2017 1:16 pm

hey all, we have an Allison in a motorhome here that's setting code po748 pc solenoid on the 1-2 shift. we replaced the internal harness along with pc solenoid. still having the same problem now. any help is appreciated. thanks

carod
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Re: 02 workhose 8.1 gas allison 1000 code op0748

Post by carod » Wed Dec 06, 2017 7:17 pm

Here are a few things to check, I fond this in an article. Being a motorhome look at the 3rd one (high electrical system demands).
Is the alternator and battery in good condition?
Inspect the connectors at the PCM, the PC solenoid and all other circuit connecting points for an intermittent condition.
Inspect the circuit wiring for an intermittent condition.
DTC P0748 may set under low voltage conditions caused by high electrical system demands.
Regards
Rod Roy

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