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This technical bulletin is part of Diesel Help’s member-only diagnostic library.
When fault codes stop making sense, the issue is often understanding how the system you’re working on is designed to operate.
Start here:
Know the diesel fuel system you are diagnosing
Tagged engine light on, fuel pump test, ​Loss​ ​of​ ​rail​ ​pressure, no codes, no smoke, P0087 fuel rail pressure too low, P0088 fuel rail pressure too high, P0088-00-2E rail pressure too high, P0089 fuel pressure regulator performance, P0191 Fuel rail pressure sensor circuit range/performance, slow to build minimum rail pressure, startability fault codes
