What it means
The intake manifold tuning valve (IMT) on bank 1 - which switches the intake runners between long and short paths for torque optimisation - is electrically intact yet does not move as commanded. Carbon build-up, broken linkage, or seized actuator.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
The intake manifold tuning valve on Bank 1 changes the intake runner path to suit engine speed and load. This code sets when the control module detects that the Bank 1 valve does not reach the commanded position, even if its electrical circuit appears intact.
Common causes
Most likely first.
- Intake manifold tuning valve stuck or binding
- Damaged valve linkage
- Faulty actuator
- Carbon or debris restricting valve movement
- Wiring or connector problem
Symptoms
- Check engine light on
- Possible limp mode or no-start
- Multiple follow-up faults across modules
- Reset/relearn may be needed after repair
How to diagnose it
- Record freeze-frame data and check live data for the commanded and reported Bank 1 tuning-valve position, along with related intake or actuator faults.
- Identify Bank 1 from the vehicle’s service information, then inspect its valve actuator, linkage, connectors, and nearby wiring for damage or looseness.
- Command the Bank 1 valve through its range with a scan tool, if supported, and observe whether the actuator and linkage move smoothly and reach the reported positions.
- With the engine off, check the Bank 1 valve and linkage for binding, breakage, carbon, or debris that prevents full travel.
- If the valve moves freely, test actuator operation and position feedback against the manufacturer’s procedure before replacing parts.
Common fixes
- Reconnect or repair damaged wiring or a loose connector at the Bank 1 actuator.
- Remove carbon or debris restricting the Bank 1 tuning valve, where the service procedure allows cleaning.
- Repair or replace a broken or binding Bank 1 valve linkage.
- Replace the Bank 1 actuator or tuning-valve assembly if testing confirms it cannot move or report position correctly.
Can I keep driving?
If the engine runs smoothly and no severe warning appears, a short trip for diagnosis is usually reasonable, but reduced torque or fuel economy may occur. Avoid hard acceleration if power is limited, and stop if the engine runs roughly or develops additional serious warnings.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.