Cummins Fault Code
Free · no signupP0252
Engine Surges under Load / Cuts Out
System
Fuel System
Symptom
Engine Surges under Load / Cuts Out
Diagnosis & fix steps
LOGIC: Injection Pump Fuel Metering Control "A" Range/Performance.
ACTION: Test Electronic Fuel Control (EFC/IMV) valve resistance (~3.2Ω). Perform a fuel pressure relief valve (PRV) return flow check to identify mechanical leakage.
Red Seal field insights
Metering Physics: Actual rail pressure fails to track commanded fuel delivery curves due to physical plunger scoring or internal varnish build-up on the fuel metering spool.
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