HiAce Van (1KD): No acceleration / lack of power
Suspect the DPF (the filter that traps exhaust soot) first: with more cases collected, a clogged DPF accounts for over a third of the 'won't accelerate' cases. Next come the injectors and the supply pump (tied), which blunt acceleration when they can't spray fuel properly or build pressure. After that, a soot-clogged intake manifold and air leaks around the intercooler. On a diesel, 'won't accelerate' means exhaust, fuel or air is short somewhere. Whether a warning light is on, and whether an automatic regeneration has run recently, point you in the right direction.
What to suspect, in order
Repair cost estimates are shown only for parts with three or more cases that record a cost.
- How to tell (things you can check yourself)
- Check for an exhaust or DPF symbol on the dash. With mostly short urban trips, revs rise but the car doesn't go, and the exhaust smells strong. Regeneration happening very often, or not at all lately, is another clue.
- If you leave it
- Power is restricted further and the car may be limited with the light on. Poor exhaust flow also stresses the turbo and other exhaust parts.
- Typical model years and mileage
- 2007–2009 model years、9,080–162,500 km (median 43,000 km)
- How to tell (things you can check yourself)
- Listen for idle clatter louder than before. Often paired with hiccups mid-acceleration, white smoke and heavier vibration only when the engine is cold. Note any drop in fuel economy too.
- If you leave it
- Uneven injection keeps combustion unstable and loads the engine and the exhaust filter. Power can drop so far that pulling away becomes difficult.
- Typical model years and mileage
- 2008–2012 model years
- How to tell (things you can check yourself)
- More vibration at idle, black smoke comes easily, and you felt a lack of power before any DPF warning. The intake passage is narrowed by soot; it's obvious once removed for inspection.
- If you leave it
- Driving with a narrowed intake keeps producing soot and clogs the DPF sooner.
- Typical model years and mileage
- 116,720–218,000 km (median 210,000 km)
- How to tell (things you can check yourself)
- Think back: harder starting lately, sudden loss of power on the move? A typical pattern is a sharp drop when you floor it merging onto a motorway or climbing. A check engine light that comes and goes is another clue.
- If you leave it
- It supplies fuel at high pressure; if it weakens, output is unstable and the engine can stop while driving.
- How to tell (things you can check yourself)
- Listen for a hiss or 'pshh' of escaping air when you floor it. Typical pattern: no power only on hills or when loaded, and little sense of turbo boost. Look under the bonnet for a thick hose coming loose at its base or oily seepage.
- If you leave it
- Running short of air makes the mixture rich, producing black smoke and clogging the exhaust filter faster.
This is the order to suspect, nothing more. Diesel power loss often has several overlapping causes. Confirm with an inspection.
FAQ
- It has no power — can I keep driving?
- A short trip to the workshop is usually fine, but avoid motorways and heavy loads. Lacking power when merging or climbing is dangerous. If a light is on or there's smoke or noise, get it seen soon.
- How long does the repair take?
- Cleaning a blockage or fixing wiring is usually quick. Fuel-system parts depend on availability. We give an estimate once the cause is narrowed down.
- Will it pass the inspection in this state?
- Exhaust condition and warning lights affect the test. Heavy black smoke or a lit lamp should be fixed first.
- Will a good motorway run fix it?
- If soot has built up from short trips, sustained driving can help. Once the light is on it often won't recover by itself, and if fuel or wiring is involved, driving changes nothing. Get it checked before a long trip.
Cases (what it was, and how it was fixed)
Each collected case: model year, mileage, symptom combination, cause and parts replaced, cost and source. Facts only, no quoted text.
Any other symptoms? Tap the ones that apply to filter the cases and see which parts were common for that combination.
| Code / year | Mileage | Other symptoms | Cause / parts replaced | Cost | Source |
|---|---|---|---|---|---|
| KDH201 2007 model year | — | White smoke、DPF warning light / regeneration won't finish | Injectors、DPF (diesel particulate filter) | — | Shop blog (JP) |
| KDH206 | — | Check engine light on | Injectors、Supply pump (high-pressure fuel pump)、Common rail | ¥385,800 | Shop blog (JP) |
| KDH206 2008 model year | 200,000 km | — | DPF (diesel particulate filter) | — | MLIT (JP) |
| KDH201 2015 model year | 44,000 km | Check engine light on、Rough idle / vibration | Supply pump (high-pressure fuel pump) | — | MLIT (JP) |
| KDH201 | 210,000 km | — | EGR valve、Intake manifold | — | Shop blog (JP) |
| KDH201 2009 model year | 17,000 km | — | A/C compressor、Intercooler、Wiring / connector | — | MLIT (JP) |
| KDH206 2013 model year | 50,000 km | Rough idle / vibration、Check engine light on | Catalytic converter | — | MLIT (JP) |
| KDH201 2007 model year | 232,759 km | Check engine light on | Alternator、Wiring / connector | — | MLIT (JP) |
| KDH201 2014 model year | — | DPF warning light / regeneration won't finish、Check engine light on | DPF (diesel particulate filter) | — | MLIT (JP) |
| KDH201 2012 model year | 90,000 km | Check engine light on | Injectors | — | MLIT (JP) |
| KDH206 2012 model year | 65,900 km | Check engine light on | エンジン制御コンピューター | — | MLIT (JP) |
| KDH206 | 220,000 km | Black smoke | Intake manifold、Turbocharger、Intercooler | — | MLIT (JP) |
| KDH206 2012 model year | 120,000 km | Check engine light on | Injectors、Supply pump (high-pressure fuel pump) | — | MLIT (JP) |
| KDH206 2007 model year | 137,500 km | Check engine light on、DPF warning light / regeneration won't finish | DPF (diesel particulate filter) | — | MLIT (JP) |
| KDH206 2008 model year | 93,400 km | — | Intake manifold | — | MLIT (JP) |
| KDH221 2008 model year | 43,000 km | Check engine light on | DPF (diesel particulate filter) | — | MLIT (JP) |
| KDH206 | 25,000 km | DPF warning light / regeneration won't finish、Check engine light on | Catalytic converter、DPF (diesel particulate filter) | — | MLIT (JP) |
| KDH206 2008 model year | 50,000 km | Check engine light on | DPF (diesel particulate filter) | — | MLIT (JP) |
| KDH201 2008 model year | — | DPF warning light / regeneration won't finish | DPF (diesel particulate filter) | — | MLIT (JP) |
| KDH201 2008 model year | 13,600 km | — | DPF (diesel particulate filter) | — | MLIT (JP) |
| KDH206 2008 model year | 7,000 km | — | Turbocharger | — | MLIT (JP) |
| KDH206 2007 model year | 2,300 km | — | DPF (diesel particulate filter) | — | MLIT (JP) |
Costs are as recorded in each case and vary by vehicle condition, region and shop. "—" means not recorded.
For DIY repairers: find the part
Searches by the No.1 part name. Always confirm fitment by model code.
Sources
- MLIT Vehicle Defect Information Hotline (Japan)（19 cases）
- Repair shop blogs (Japan)（3 cases）
Created by processing the Vehicle Defect Information Hotline data (Ministry of Land, Infrastructure, Transport and Tourism, Japan) (https://renrakuda.mlit.go.jp/renrakuda/opn.html)
No text is quoted from these sources. Only the facts of each case (model, symptom, cause, cost) are aggregated.
Reviewed by Tama Inc. (workshop certified by the Kanto District Transport Bureau) Reviewed on 2026-09-11 Updated 2026-09-13
This page shows what to suspect first, based on aggregated nationwide repair cases and our own experience. Always confirm the cause with an inspection. Repair costs are medians and ranges from the cases; they vary by vehicle condition, region and workshop.
For lack of power, look at soot on the intake side (EGR and intake manifold) before replacing parts. Many come back to life after a clean. Check fuel pressure and injector correction values on the scan tool at the same time.