P2009

Intake Manifold Runner Control Circuit Low Bank 1

Fuel & air metering (intake) Generic OBD-II Low

What it means

P2009 means the engine control module has detected low voltage (a likely short-to-ground) in the intake manifold runner control circuit on bank 1. These runners adjust airflow to boost torque at different engine speeds, so a fault usually shows up as slightly reduced low-end power or throttle response. It does not cause a stall or no-start.

Low

Can I keep driving? Safe to drive in most cases; you may notice slightly reduced low-end torque or throttle response, but it isn't a stall or no-start code.

Real-world scan data

Seen in

347

scans in the past year

Found in

0.1%

of scans

0.1%

of scans that found faults

Appears alongside · share of P2009 scans

P0037in 15.3% of scans

P0031in 14.4% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Mild loss of low-end power or sluggish throttle response
Occasional rough idle
Slightly reduced fuel economy

Common causes

Most likely first

Short-to-ground or low voltage in the intake manifold runner control (IMRC) circuit wiringLikely
Failed IMRC actuator or solenoidCommon
Corroded or loose connector at the actuatorCommon
Sticking runner flaps or seized linkageLess often
Faulty engine control module (ECM/PCM)Less often

How to diagnose & fix

Work through it in order

Inspect the IMRC actuator connector and wiring for a short-to-ground, corrosion, or damage; repair as needed.
Check the runner control linkage and flaps for sticking or carbon buildup, and free or clean as required.
Test the actuator/solenoid and its supply; replace if it doesn't respond correctly.
Verify vacuum-operated systems have intact hoses (some designs use vacuum actuation).
If wiring and actuator test good, have the ECM/PCM evaluated. Clear and re-test.

FAQ

Quick answers

Is it safe to drive with P2009?+

Generally yes. You may feel slightly weaker low-end response, but it won't leave you stranded. Fix it to restore full performance and emissions.

Can I just clear P2009?+

It will come back if the circuit fault or actuator problem remains, since the ECM checks the runner control circuit regularly.

Read & clear P2009 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX