RigMedic blog
Diesel diagnostics, maintenance guides, and shop-floor tips.
Reading diesel fault codes: OBD-II vs SAE J1939
Light-duty diesels speak OBD-II P-codes; heavy trucks speak J1939 SPN/FMI. Here is how to read both and what the numbers actually mean.
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P0087: Fuel Rail Pressure Too Low — causes and fixes
P0087 means measured rail pressure fell below what the ECM commanded. Here are the usual culprits, in the order most shops find them.
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DPF regeneration explained: what the light is telling you
The diesel particulate filter cleans itself by burning off soot. Here is what passive, active, and forced regen mean, and when a light is a real problem.
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