P1516 Code: Intake Manifold Runner Control (IMRC) Input Error (Bank 1)
🟠 Moderate severity · drivable
You can usually keep driving, but you may notice less power at higher RPM, so have it diagnosed soon.
What P1516 means
The intake manifold runner control (IMRC) system on bank 1 reported a position that doesn't match what the engine computer expected. The IMRC adjusts flaps inside the intake to improve power and efficiency, and the computer stored P1516 when the input signal didn't line up with the commanded position.
Symptoms
- Check engine light is on
- Loss of power at higher RPM
- Poor acceleration
- Reduced fuel economy
Common causes
- most common: Sticking or faulty IMRC actuator
- common: Carbon buildup on the intake runner flaps
- common: Damaged wiring or connector
- less common: Broken linkage between actuator and flaps
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Replace the IMRC actuator | Mechanic | $150–450 |
| Clean carbon from the intake runners | Mechanic | $100–300 |
| Inspect and repair wiring and connector | Yes | $20–100 |
Frequently asked questions
Can I drive with a P1516 code?
Yes, usually. The car will drive, but you may feel a loss of power at higher RPM, so get it checked before it gets worse.
What does the IMRC system do?
It opens and closes flaps inside the intake manifold to tune airflow, which helps the engine make better power at high RPM and stay efficient at low RPM.
How much does it cost to fix a P1516?
Most repairs run $100–$450. Cleaning carbon buildup is cheaper; replacing the actuator costs more.
Related guide: The 10 Most Common Check Engine Codes →
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.