Intake Manifold Runner Control Stuck Open (Bank 1)
Intake manifold runner is not responding properly.
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 intake manifold has adjustable runners that optimize airflow into the engine. If it stays open all the time, the engine won't get enough air at lower speeds, affecting performance.
What the computer is actually seeing
The Engine Control Module (ECM) monitors the position of the intake manifold runner control (IMRC) using position sensors and expects a specific range of inputs while the engine operates.
What a healthy reading looks like
Runner position voltage should vary between 0.5V (closed) and 4.5V (fully open); if it does not change, the system has an issue.
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.
- 11. Check all related wiring and connectors for damage or corrosion. Fix any issues found.
- 22. With the engine off, manually check the intake runner's movement. It should move freely without sticking.
- 33. Start the engine and use a scan tool to monitor the IMRC position data. Move the throttle to check for voltage response.
- 44. If the intake runner does not respond as expected, swap the actuator with a known good one and retest.
- 55. If the issue persists, test the ECM for fault codes related to the IMRC circuit. If no signal changes, replace the ECM.
Common causes
- Faulty intake manifold runner control actuator
- Bad wiring or connectors to actuator
- Stuck intake manifold runners due to carbon buildup
- Faulty ECM not sending proper signals
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's safe to drive but may lead to reduced engine performance, especially at lower speeds.
Will the code come back after clearing?
Yes, if the underlying issue isn’t fixed, the code will likely reappear.
Why does this code often pair with P2001?
Both involve the intake manifold runner control system, often indicating similar issues or related parts failure.
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