Intake Manifold Runner Control Stuck Open (Bank 1)
The intake manifold runner control valve is stuck in the open position on bank 1.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The car's computer sees that the valve controlling airflow in the engine's intake is stuck open, which can mess with engine performance.
What the computer is actually seeing
The PCM monitors the position of the intake manifold runner control valve using a voltage signal. It expects to see a change in the voltage when the valve adjusts. If the voltage remains constant at a range suggesting the valve is always open (usually above 4 volts), it triggers this code.
What a healthy reading looks like
The expected voltage from the control valve should vary from 0 to 5 volts, typically around 1.5 volts when closed and increasing as it opens.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Check the intake manifold runner control valve connector for damage or corrosion. Repair if necessary.
- 2Inspect the wiring leading to the intake manifold runner control valve for shorts or breaks. Repair any issues found.
- 3Measure the voltage at the intake manifold runner control valve connector with the key on and engine off; you should see between 0-5 volts. If voltage is constant above 4 volts, the valve is likely stuck open.
- 4With the engine running, use a multimeter to monitor the voltage while activating the manifold runner control; it should respond accordingly. If it doesn't, replace the valve.
- 5If the valve operates normally, check for any vacuum leaks in the intake manifold that may be causing erratic pressure readings.
Common causes
- Faulty intake manifold runner control valve
- Wiring issues or short circuits in the control circuit
- Faulty PCM or software glitch
- Vacuum leaks affecting manifold pressure
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate; you're safe to drive but performance may be affected. Fix soon.
Will this issue come back after clearing the code?
If the root cause isn't fixed, the code will likely return.
Why does this code appear with poor acceleration?
A stuck open runner can cause poor air-fuel mixing, leading to reduced power.
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