← All symptoms
Symptoms
Hard start, long crank or no-start
What causes it depends on the engine. 60 documented failures on 26 engines list this among their signs. Pick your engine for the causes ranked, how to tell them apart and the usual fix.
7.3 Power Stroke (1994.5-2003)
7 known causes, most widespread: CPS (camshaft position sensor) failure
6.0 Power Stroke (2003-2007)
5 known causes, most widespread: FICM (Fuel Injection Control Module) failure
6.4 Power Stroke (2008-2010)
2 known causes, most widespread: High-pressure pump (Siemens K16) destruction
6.7 Power Stroke (2011-present)
4 known causes, most widespread: CP4.2 high-pressure fuel pump contamination cascade
3.0 Power Stroke (2018-2021)
1 known cause: CP4.2 high-pressure pump failure (contamination cascade)
5.9 Cummins (1994-2007)
4 known causes, most widespread: 12v overflow valve weak (hard start / low power)
6.7 Cummins 2007-2018
2 known causes, most widespread: Lift pump / fuel delivery weakness
6.7 Cummins 2019+
3 known causes, most widespread: CP4 high-pressure fuel pump failure and fuel system contamination (2019-2020 6.7)
Ram 1500 EcoDiesel (2014-2019)
2 known causes, most widespread: Bosch CP4.2 high-pressure pump failure (recall 22V-406)
Duramax LB7-LMM (2001-2010)
1 known cause: LB7 injector failures (the defining repair of the generation)
Duramax LML (2011-2016)
3 known causes, most widespread: Bosch CP4.2 high-pressure pump failure and fuel-system contamination
Duramax L5P (2017-present)
2 known causes, most widespread: Glow plug failures - fragile ceramic tips (R&R hazard)
Duramax 3.0 (LM2/LZ0)
1 known cause: Extended crank / long-crank no-start (air intrusion, check valve, cam wheel)
3.2 Power Stroke (Transit)
2 known causes, most widespread: Common-rail injectors / injection pump faults
Sprinter 3.0 V6 (OM642)
2 known causes, most widespread: Glow plug module and cold-start roughness
Sprinter 2.1 (OM651)
1 known cause: Fuel system: high-pressure pump and piezo injectors
Triton (gas)
1 known cause: FPDM (fuel pump driver module) corrosion / failure
6.2 Boss (gas)
1 known cause: Fuel delivery service (in-tank pump / PFI injectors)
7.3 Godzilla (gas)
2 known causes, most widespread: Fuel delivery service (in-tank pump / filter / PFI injectors)
3.5 EcoBoost (gas)
5 known causes, most widespread: Cam phaser / VCT rattle and cam-timing DTCs
Transit V6 (gas)
2 known causes, most widespread: Ignition service: plugs and COP coils
6.4 HEMI (gas)
1 known cause: Fuel delivery service (in-tank pump / PFI injectors)
ProMaster 3.6 (gas)
2 known causes, most widespread: Fuel delivery: pump module, hard start and stall cluster
GM 6.0 / 8.1 Vortec (gas)
1 known cause: Hard cold start / fuel delivery wear
GM 6.0 L96 (gas)
1 known cause: Fuel delivery: pump, injectors, pressure (L96/LY6)
GM 6.6 L8T (gas)
2 known causes, most widespread: Direct-injection high-pressure fuel pump / injector failures
Built from the failure-mode records on this site: a failure is listed when its own symptom list describes this sign. Engines not shown have no documented failure with it in our records. How we tier and source facts.