The code 1230 doesn't appear in the codes listed for the engine but code 123 does
if refers to p102 fault --intake manifold pressure sensor no 1 circuit --shorted low
it is listed as a 4 fault severity non information only
I sourced this from a site alliedsystems.com that has , diagnostic fault codes for cummins engines modesl --qsb t2, qsc t2, qsl t2 qsm11 qsx15 qsk19, qsk23, qst30, qsk45/60/78
I went google and typed in-- fault code 1230 for cummins qsb 5.9 engine which bought a lot of pages concerning the engine designation
if you still cannot get the right information contact your nearest cummins service dealer for help
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