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Symptoms · 6.7 Cummins 2007-2018

6.7 Cummins 2007-2018: ticking, knocking, rattle or whine

7 documented failures on this engine list this among their signs. They are ordered from the most widespread down. Each one shows the signs in its record's own words, how to tell it from the others, the usual fix and any recall or bulletin.

  1. Holset VGT turbo sticking / actuator failure Very common · 40 complaints · 1 recall/bulletin
  2. Lift pump / fuel delivery weakness Common · 32 complaints · 1 recall/bulletin
  3. Water pump failure Common · 30 complaints
  4. Exhaust manifold cracking Common · 17 complaints
  5. Grid heater 'killer bolt' ingestion Common · 17 complaints · 2 recall/bulletins
  6. Injector 'chuffing' / seal blow-by Common · 12 complaints · 4 recall/bulletins
  7. Fan clutch failure (overheat while towing) Common · 7 complaints

Not sure which engine you have, or want the recalls for your exact truck? Check your VIN: it names the engine and lists the campaigns for that model year. Whether a recall is still open on your VIN: nhtsa.gov/recalls.

1 Holset VGT turbo sticking / actuator failure
verified How widespread: Very common 40 NHTSA owner complaints match it, out of 1,355 checked

How it shows up

  • excessive idle/lope or whistle change; failed regens because the turbo cannot build regen heat
Its other signs
  • loss of exhaust-brake function (the classic first sign - the VGT is the exhaust brake)
  • low power / boost DTCs (over/underboost), smoky acceleration
  • turbo actuator DTCs; 'Service Electronic Throttle'?

How to tell it apart

  • actuator/nozzle-position DTCs and live vane-position PID vs commanded - stuck or lagging vane position is the tell
  • test the exhaust brake at cold start: no RPM dip / braking effect = nozzle not closing
  • inspect vane motion with the actuator commanded (shop tool); look for soot coke in the turbine housing

Usual fix

replace the electronic actuator alone when vanes move freely but the actuator is dead (cheaper than a turbo)

Recalls and bulletins

TSB 11-001-08

Root cause, parts and sources →

2 Lift pump / fuel delivery weakness
verified How widespread: Common 32 NHTSA owner complaints match it, out of 1,355 checked

How it shows up

  • FCA (fuel control actuator) ticking / rough idle when failing
Its other signs
  • P0087 / low-rail-pressure DTCs, worse under load or with tuning
  • long cranks, hesitation, power loss when the tank is low
  • water-in-fuel warnings if filtration is neglected

How to tell it apart

  • measure supply/return fuel pressure under load (the decisive test) - spec per service data
  • scan rail-pressure actual vs desired under a load test; P0087 points delivery-side first
  • isolate FCA vs lift pump: FCA symptoms (ticking/rough idle) vs delivery starvation under load

Usual fix

replace the worn lift pump with a stock-type in-tank unit (stock trucks)

Recalls and bulletins

TSB 08-036

Root cause, parts and sources →

3 Water pump failure
verified How widespread: Common 30 NHTSA owner complaints match it, out of 1,355 checked

How it shows up

  • bearing noise from the front of the engine; overheating if run low
Its other signs
  • coolant weep from the weep hole / front cover area
  • coolant smell, occasional low-coolant warnings

How to tell it apart

  • trace the leak to the weep hole with a UV dye / clean-and-observe
  • spin/listen for bearing play at service intervals
  • check coolant condition and service history - abrasive coolant tells you the replacement needs a flush too

Usual fix

replace the water pump; flush and refill with spec coolant while open

Root cause, parts and sources →

4 Exhaust manifold cracking
verified How widespread: Common 17 NHTSA owner complaints match it, out of 1,355 checked

How it shows up

  • exhaust tick on cold start that fades (or doesn't) with heat
Its other signs
  • soot tracks along the manifold surface; visible cracks between runners
  • boost/exhaust leak codes in advanced cases

How to tell it apart

  • cold-start listen at the manifold; soot-trace inspection under good light
  • crack-dye or remove-and-inspect when ambiguous
  • check turbo up-pipe flanges for the same leaks while there

Usual fix

replace with a new/reinforced manifold and gaskets (upgrade designs exist)

Root cause, parts and sources →

5 Grid heater 'killer bolt' ingestion
verified How widespread: Common 17 NHTSA owner complaints match it, out of 1,355 checked

How it shows up

  • sudden loss of power, knocking or clicking, then catastrophic engine damage once a broken nut or bolt reaches a cylinder (owners most often name cylinder #6)
Its other signs
  • P2609 (intake air heater circuit) or a check-engine light can come first: owners report the code when the hardware has started to burn or break
  • hard cold starts / no grid-heater cycling when the heater itself has failed separately
  • the grid-heater terminal nut or bolt visibly burned, loose or broken on inspection (found before it lets go)

How to tell it apart

  • treat a P2609 / intake heater code as a reason to inspect the grid heater hardware before driving further
  • remove the intake horn and inspect the grid heater terminal nut and bolt for burning, looseness or breakage (shop check at any service visit)
  • after a failure: borescope the cylinders (owners most often report #6) and inspect the intake manifold for missing hardware before restarting

Usual fix

prophylactic: replace the factory grid heater with a retention/upgrade kit or an intake design without the internal fastener - cheap insurance against engine damage

Recalls and bulletins

TSB 9003585TSB 18-005-13

Root cause, parts and sources →

6 Injector 'chuffing' / seal blow-by
verified How widespread: Common 12 NHTSA owner complaints match it, out of 1,355 checked

How it shows up

  • audible 'chuff chuff' exhaust beat (compressed gas past an injector's copper seal)
Its other signs
  • fuel in the oil / rising oil level (pairs with the oil-dilution mode)
  • fuel smell, smoke, rough cylinder balance; balance-rate DTCs

How to tell it apart

  • cylinder-balance / contribution test to locate the weak hole
  • listen at the exhaust for the chuff beat; check oil level trend for dilution
  • return-flow / leak-back test per injector where equipped

Usual fix

replace copper sealing washers (cheap) if the injector itself tests healthy

Recalls and bulletins

TSB 05175565A$TSB 18-002-14 REV. BTSB 18-002-14 REV. ATSB 18-002-14

Root cause, parts and sources →

7 Fan clutch failure (overheat while towing)
verified How widespread: Common 7 NHTSA owner complaints match it, out of 1,355 checked

How it shows up

  • fan-clutch DTCs; belt noise from a wobbling clutch
Its other signs
  • temperature climbs only under load/towing/AC-high but stays normal unloaded
  • fan roars constantly (stuck engaged) or never engages

How to tell it apart

  • command the fan on with a scan tool and watch RPM response
  • watch coolant temp vs fan-speed PID on a loaded drive
  • inspect for wobble/free-play mechanically

Usual fix

replace the fan clutch (electric-controlled unit); verify the cooling stack isn't debris-plugged at the same time

Root cause, parts and sources →

Other symptoms on the 6.7 Cummins 2007-2018

Hard start, long crank or no-startLoss of power, limp mode or derateWhite smoke from the exhaustLosing coolantOverheating or temperature creeping upOil leak, oil consumption or rising oil levelMisfire, rough idle, hesitation or surgingDEF, DPF and regeneration warnings

Everything on the 6.7 Cummins 2007-2018Its recalls and bulletins

Order: how widespread each failure is in its record (near-universal, very common, common, occasional, rare), then the number of NHTSA owner complaints that match its keywords. Complaint counts are keyword matches, not a manual review of each complaint. A symptom listed here means the failure is documented with that sign; it is not a diagnosis of your truck. Tiers: verified, aggregated, contested, data-gap. How we tier and source facts.