P2070 on 2004-2007 Mazda RX-8 — Intake Manifold Tuning (IMT) Valve Stuck Open
1 vehicles · 1 makes · $150-$500 repair
How to diagnose and fix P2070: most-reported vehicles
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Mazda RX-8 · 2004–2007
Carbon accumulates on the Secondary Shutter Valve (SSV) shaft and swirl/auxiliary port valves in the intake manifold, causing the SSV to stick (typically open) since it only actuates at higher RPM. This is a documented TSB-level complaint (Mazda TSB 01-019/08) producing hesitation and lack of power, often eventually setting code P2070; some cars also develop an idle rattle/chatter from the intake manifold. It is aggravated by low-RPM driving that never fully exercises the valves.
Common Symptoms
- Hesitation under acceleration
- Lack of power, especially at higher RPM
- Rough or inconsistent throttle response
- Rattle/chatter from intake manifold at idle
- Reduced top-end performance
How to Fix
Remove the upper intake manifold and clean the SSV shaft and swirl valves of carbon; per the TSB, install the revised SSV (stronger actuator force) and gaskets. Preventively, run the engine to higher RPM regularly to keep the valves free.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Mazda N3H5-20-160F updated secondary shutter valveOEMMazda N3H5-20-160F
Updated SSV assembly after TSB applicability and mechanical failure are confirmed Fitment/availability: The direct product page identifies genuine Mazda N3H5-20-160F, showed In Stock, $188.99 and a 5-7-business-day ship estimate.
- Genuine Mazda N3H4-20-155A SSV gasketOEMMazda N3H4-20-155A
Required replacement gasket when the SSV is removed Fitment/availability: The direct specialist page identifies N3H4-20-155A for 2004-2011 RX-8 13B-MSP, showed $12.50 and Add to Cart. Follow the TSB/workshop-manual removal and cleaning p…
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Sources for this issue (3)
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P2070 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P2070 mean?
P2070 stands for "Intake Manifold Tuning (IMT) Valve Stuck Open." This code means the engine computer detected that the intake manifold tuning (IMT) valve is stuck in the open position. The IMT valve adjusts the intake manifold's tuning to optimize airflow and torque at different engine speeds. When it is stuck open, the engine loses the intended airflow tuning, which can reduce low-end torque or overall performance and trigger a check engine light. It is not an immediate breakdown concern but should be repaired to restore drivability and emissions compliance.
What are the most common causes of P2070?
The most common causes of P2070 are: Carbon buildup jamming the IMT valve open, Stuck or seized IMT valve actuator, Failed vacuum actuator or leaking vacuum line, Broken valve linkage, Faulty IMT valve position sensor, Wiring or connector fault to the IMT solenoid. The specific cause varies by vehicle.
How much does it cost to fix P2070?
Repair costs for P2070 range from $150 to $500, depending on the vehicle and root cause.
Which vehicles are affected by P2070?
Au7o has documented P2070 across 1 vehicle models from 1 manufacturers: Mazda.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.