This is a Technical Journal: Text plus 2 PDFs and 1 .PNG Oil Consumption test. Perform the test. Follow service procedure Description and Service sections updated to clarify that vehicle reports are not required.
full bulletin at NHTSA ↗2005 Volvo S40 engine problems
moderate 16 complaints filed with NHTSA · avg repair $3,100 · see engine across all vehicles →
Failure mileage
Complaints
16
Recalls
0
Avg fix
$3,100
When does it fail?
Of the 16 engine complaints filed for the 2005 Volvo S40, here's the actual mileage breakdown — failures cluster heaviest at 50,000-75,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
Engine accounts for 20% of all owner complaints filed against this vehicle, across 8 categories tracked.
No new NHTSA engine complaint has been filed on this vehicle in over 8 years — the issue may be aging out of the active population.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering engine on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
Engine Control Module (EMS) Software (MSW) Information â August 2022; Improvement List (Change Log) - US21+OBD22 (13L VGT, TC) And US17+OBD22 (11L) Emissions
full bulletin at NHTSA ↗This is a Technical Journal: Oil in cooling system. New cleaning method developed.
full bulletin at NHTSA ↗This is a Technical Journal: Oil in cooling system. New cleaning method developed.
full bulletin at NHTSA ↗This is a Technical Journal: Oil in cooling system. New cleaning method developed.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The 2005 Volvo S40 shows a pattern of engine and related system failures that owners and dealership staff confirm as common to this year and model. A/C compressor clutch and compressor problems are reported repeatedly—cooling works briefly at startup but fails in hot weather (90°F+), requiring constant on-off cycling. One dealership service advisor explicitly told an owner this is "a constant problem" with repeated repairs.
Drive belt and timing belt failures are critical: two owners reported complete belt failure at 63K and 85K miles, well below Volvo's stated 125K replacement interval, resulting in catastrophic engine damage with $5000–$5600 repair estimates. Neither owner received warranty coverage.
The oil trap housing (PCV system) clogs frequently, documented at 22.5K, 58K, 68.3K, and 100K+ miles, causing high-pitched noise, whistling, vibration, and oil leaks. One owner had two separate failures in 45,800 miles.
Fuel system issues are widespread: vehicles stall without warning at highway and city speeds, sometimes with check engine lights. A recall (08V033000) for fuel pumps exists, but at least one owner's stalling persisted after the recall repair.
Additional failures include engine block fractures, battery cable issues requiring replacement twice in 14 months, battery cable failures causing stalling, and one report of unintended acceleration.
Same Volvo S40 engine reports on nearby years: 2006
Failure modes owners describe
A/C compressor clutch and compressor failure
A/C blows cold initially, then warm air after a few minutes in hot weather (90°F+). Repeated cycling on/off temporarily restores cooling. Owner reports dealership service advisor confirmed this as a known, recurring issue on 2005 S40s; cited compressor clutch, compressor, or both as culprits. Estimated repair cost $1500 at dealership.
When: Began at ~9-10K miles (first occurrence), recurred at ~35K miles, became constant by 47K miles
Symptoms owners cite: A/C blows warm air after few minutes in hot weather; Repeated on/off cycling temporarily restores function; Only works for minutes before failing again
Repairs/costs cited: $1500 estimated at dealership for compressor clutch and/or compressor replacement
Fuel system stalling and check engine light
Engine stalls while driving with no prior warning lights, or stalls after check engine light illuminates. Two narratives document stalling on highway at 55 mph and lower speeds. One owner had fuel pump replaced per recall 08V033000 but continued to stall; dealer also recommended fuel pressure sensor replacement. Another narrative describes fuel pressure monitor failure at highway speeds.
When: 39K–75K miles reported across different vehicles
Symptoms owners cite: Vehicle stalls while driving; Check engine light illuminates; Stalling recurs after dealer repair; Loss of power at highway speeds
Codes mentioned: 08V033000 (fuel system, fuel pump recall)
Repairs/costs cited: Fuel pump replacement per recall did not resolve stalling in at least one case; fuel pressure sensor replacement also recommended
Recalls/TSBs owners mention: Recall 08V033000 issued for fuel pump; one owner claims fuel system repairs inadequate
Drive belt and timing belt failure
Drive belt broke, causing timing belt to break inside engine and resulting in catastrophic engine damage. Two owners reported this at relatively low mileage, with repair estimates of $5000–$5600. Factory recommendation for belt replacement is 125K miles, but failures occurred at 63K and 85K miles.
When: 63,000 and 85,000 miles
Symptoms owners cite: Engine stalls while driving on highway; No warning prior to failure
Repairs/costs cited: $5000–$5600 repair estimate including all belts, pistons, valves, top of engine; owners state 50K service did not include belt maintenance
Oil trap housing (PCV system) clogging and failure
Oil trap housing becomes clogged, releasing air pressure and causing engine noise and vibration. One T5 owner documented two separate failures at 22.5K and 68.3K miles. Another owner reports whistling noise on startup at 100K miles with oil leak from trap. Narratives also cite clogged PCV intake manifold causing howling noise at low speeds. High-screeching idle noise also documented.
When: 22,500 miles (first failure), 68,330 miles (second failure), 58,000–100,000+ miles reported across different vehicles
Symptoms owners cite: High screeching noise at idle; Howling/whistling noise; Oil leak from trap housing; Abnormal vibration on startup; Clogged lines releasing air pressure
Repairs/costs cited: First repair at 22.5K covered under warranty: check valve 30677524, oil housing 30684381, hose clamp 976561, ECM upgrade 30668282. Second failure at 68.3K: ECM 30668282, hose clamp 976561, hose 8670008, oil housing 30684381; $747.17 labor + parts out of warranty
Recalls/TSBs owners mention: Warranty covered first failure; second failure denied further replacement under warranty
Engine block fracture
Passenger side of engine block fractured along top. Owner noticed fracture upon opening hood; abnormal vibration present on startup. No formal diagnosis obtained.
When: 43,000 miles
Symptoms owners cite: Abnormal vibration from engine on startup; Visible fracture on passenger side of engine block
Battery cable failure
Vehicle stalled while driving at 55 mph with no warning lights. Battery cables were replaced twice in fourteen months. Dealer could not diagnose the underlying problem; manufacturer had no solution beyond returning to dealer.
When: At approximately 39,000–40,000 miles; two replacements within 14 months
Symptoms owners cite: Complete stall while driving; No warning lights prior to failure
Repairs/costs cited: Battery cables replaced for second time in fourteen months
Hood insulator fasteners loosening
Hood insulator fasteners come off and could contact accessory drive belt, potentially causing engine failure. Problem occurs at least every two days; dealer unable to duplicate issue when examined.
When: Unknown mileage; problem recurring every 1–2 days
Symptoms owners cite: Loud shaking and stuttering on cold start; Sounds like running on fewer cylinders or bad timing; Loose hood insulator fasteners
Recalls/TSBs owners mention: Dealer unable to duplicate problem
Unintended acceleration
Vehicle accelerates on its own after owner releases gas pedal during turns. Engine revs up and car jerks forward without pedal input.
When: Multiple incidents within one month prior to complaint; no mileage stated
Symptoms owners cite: Sudden acceleration without pedal input; Engine revs up autonomously; Vehicle jerks forward after turning
PEM (pressure emanation module) defect and warranty dispute
Owner reports PEM became faulty within 2 weeks of initial complaint. Dealership initially misdiagnosed as fuel pressure sensor and fuel pump issue. Local mechanic properly identified and relocated PEM per recall/extended warranty. Volvo refused $634 reimbursement claim, first citing non-genuine part (later verified as genuine), then claiming owner declined the fuel sensor repair (which was unrelated to PEM recall). Car failed to start after 2-week delay.
When: Car failed to start approximately 2 weeks after initial service visit
Symptoms owners cite: Pumping noise from rear of vehicle; Check engine light illuminated; Car failed to start
Repairs/costs cited: $634 out-of-pocket repair; PEM relocated to new location per recall specifications
Recalls/TSBs owners mention: Recall/extended warranty available for PEM relocation; Volvo refused reimbursement claim citing unrelated fuel sensor issue and non-genuine part (later disputed)
Synthesized from 16 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 8 most recent
Car loosing power and engine missing at highway speeds. Engine light went on. Failure of fuel pressure monitor.
Engine failure. Car stalled while driving on highway. Car was towed to wynn Volvo. Was told that the belts broke, leading to the breakage of the timing belt, located inside the engine, resulting in major damage to the engine. Was given a quote of $5600 to repair. The car has 63000 miles and the manual does say that the belts need to be replace at 125 thousand miles. The services suggested…
Tl*the contact owns a 2005 Volvo s40. The contact stated that the check engine light illuminated and the vehicle stalled while she was driving. The vehicle was taken to an authorized dealer where it was repaired according to recall 08v033000 (fuel system, gasoline: delivery:fuel pump) but the contact still experienced the same failure after the repair. The dealer also informed her that she needed…
Engine failure. Car stalled while on highway. Upon arrival at Volvo service dealer, I was told that a drive belt broke, leading to the breakage of the timing belt and subsequent extreme damage to the engine. All belts, pistons, valves and top part of engine needed replacing. Approximate damage was $5000. Car has only 85k on it, drive belt and timing belt have a recommended replacement in…
Car is all of a sudden accelerating on its own. It has happened a handful of times within the last month. I will make a turn, let off the gas peddle and then the car will just jerk forward revving up the rpms and accelerating on its own.
Tl*the contact owns a 2005 Volvo s40. The contact stated that while driving approximately 55 MPH when the vehicle completely stalled. There were no warning lights prior to the failure. The contact was able to coast to the side of the road. She restarted the vehicle and was able to drive to her destination where the vehicle stalled again. The vehicle was taken to an authorized dealer where the…
In august of 08 my 2004.5(new body style) Volvo s40 t5's engine began to make a high screeching noise at idle and the check engine light came on. It had 61,000miles and I brought it to the dealership where they diagnosed that it needed a new oil trap. The problem has not recurred. My wife's 05 s40 t5 has 58,000miles and the same problem has occurred in her's. There must be an issue with this…
I have a 2005 Volvo s40 2.4i with about 47k miles and I am having problems with the a/c. I live in houston (tx) where it gets very hot so I have to have the a/c on constantly. When I first turn the car on and drive off, the a/c starts cooling and working just fine. However, when it is 90f or above, the a/c begins to blow warm air after a few minutes. When that happens I have to turn it off and…
Had engine trouble with your 2005 Volvo S40?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the engine problem on the 2005 Volvo S40?
It's a documented issue but not catastrophic. 16 complaints have been filed. Repairs average $3,100 and most owners catch it before it causes a breakdown.
At what mileage does the engine typically fail?
Across the 13 complaints that reported odometer mileage, most engine failures cluster between 60,000 and 86,000 miles, with the median around 68,000. A quarter of owners report trouble before 60,000; a quarter make it past 86,000. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $3,100 for engine repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to engine?
No active recalls currently cover engine issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2005/Volvo/S40.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.