What it means
The control line of the IMT valve on bank 1 is open - the ECU cannot drive the valve. The intake manifold runner control (IMRC) flaps tune intake geometry for filling efficiency across the rpm range; stuck flaps cost part-load torque and can set lean codes.
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 an open in the Bank 1 valve’s control circuit, interrupting the electrical path needed to operate the valve.
Common causes
Most likely first.
- Open in valve or wiring
- Pin pushed back out of connector body
- Cracked solder joint inside the module or sensor
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 scan for related intake-valve or electrical faults, then check live data for the Bank 1 valve command and any available position feedback.
- Identify Bank 1 from the vehicle’s service information and inspect its actuator connector and harness for a loose plug, broken wire, pushed-back pin, or corrosion.
- Check the Bank 1 valve and linkage for physical damage or binding, while keeping the circuit fault in mind as the valve may not move when commanded.
- Use the wiring diagram to test continuity through the Bank 1 control circuit and check for a poor terminal fit at the connector.
- If wiring and terminals are intact, test the actuator and control-module output according to the manufacturer’s procedure.
Common fixes
- Reconnect the Bank 1 actuator plug or restore a pushed-back terminal.
- Repair an open or damaged wire in the Bank 1 valve-control circuit.
- Repair a poor connector contact or damaged terminal.
- Replace the Bank 1 actuator or repair the module output only if circuit testing confirms that component is faulty.
Can I keep driving?
A short, gentle trip may be possible if the engine runs normally, but the Bank 1 valve may remain in one position and reduce performance or efficiency. Avoid hard acceleration if power is reduced, and stop if the engine runs poorly or other serious warnings appear.
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.