The Bosch CP4, engine by engine
The Bosch CP4 is one high-pressure pump design shared by several diesel pickups - and one documented failure pattern shared with them: the pump's internals wear or its casing fails, metal travels down the fuel line, and the repair becomes the pump, the injectors and the cleaning in between. Which engines actually have it is a used-buyer's question, and the internet answers it with forum lore.
This page answers it from our records, engine by engine: the documented failure mode with its provenance tier, the pump part on record with its own fitment years and number, what the parts budget looks like, and the NHTSA safety recalls that name the pump. Engines our records show without a CP4 are listed at the bottom, with what they use instead.
Every row is a published record - see /disclosure/
Engines with the Bosch CP4 (5)
Prices are Dave's Auto Center retail, the same as in his store (the only seller this site links); a part without a price is not listed there - its page has a link to ask Dave's for it by number. The parts budget column opens the repair-cost row for that engine: parts only, no labor. The pump years come from each part's own fitment record - the generation changed mid-run on some engines, and the fitment says which truck gets which pump.
Engines our records show without a CP4 (4)
| Engine | What it uses instead |
|---|---|
| Duramax L5P | Denso HP4 - the record states plainly: no CP4 on the L5P - the record |
| Duramax LB7-LMM | Bosch CP3 - the record |
| 6.7 Cummins 2007.5-2018 | Bosch CP3; the CP4 arrives with the 2019 redesign - the record |
| 5.9 Cummins | P7100 (12v), VP44 (24v to 2002), Bosch CP3 (common rail from 2003) - no CP4 - the record |
What the failure looks like, engine by engine
hard starting or a sudden stall, sometimes with no prior warning - full root cause, diagnosis steps and fixes on the failure page; all campaigns on the recalls page.
sudden loss of power / rough running, then a no-start as rail pressure collapses - full root cause, diagnosis steps and fixes on the failure page; all campaigns on the recalls page.
sudden loss of power and stall, often with no warning or after a 'Service Exhaust System' type message; may not restart - full root cause, diagnosis steps and fixes on the failure page; all campaigns on the recalls page.
hard start / crank-no-start, rough running, low fuel rail pressure (P0087 family), power loss under load - full root cause, diagnosis steps and fixes on the failure page; all campaigns on the recalls page.
hard start / crank-no-start, rough running, low fuel rail pressure (P0087 family), power loss under load - full root cause, diagnosis steps and fixes on the failure page; all campaigns on the recalls page.
One pump design, one failure pattern, five engines - but the fix and the price differ by engine and by year. This page is an index: open the failure page before buying anything, and mind the tier on every fact. A recall covers only the trucks its own text names - read it on the recalls page. Whether a recall is still open on a specific VIN is not known here - nhtsa.gov/recalls.