Code P1077 means your intake manifold runner control (IMRC) system has failed at low RPM, especially on Honda CR-V models — it pops up when those butterfly valves refuse to cooperate.
What can a bad intake manifold runner control cause?
A failing IMRC can make your engine idle roughly, lose power, hesitate when you hit the gas, and throw a check engine light — all because it’s not managing airflow properly through the intake.
You’ll probably notice the engine feels sluggish when you try to accelerate or climb hills. Ignore it long enough, and you might end up with bigger drivability headaches or even permanent engine damage. Usually, swapping the IMRC motor, its linkage, or the sensor fixes the problem.
What is intake runner control?
Intake runner control (IMRC) uses little motorized flaps and valves to switch between two intake paths in the manifold — it’s all about optimizing airflow for different engine speeds.
At low RPM, it helps with torque. At high RPM, it boosts horsepower. You’ll find this system in lots of modern four-cylinder and V6 engines, including plenty of Hondas. The ECM keeps an eye on sensors and driving conditions to tell the IMRC exactly what to do.
Can I drive my car with a bad intake manifold?
Don’t keep driving if your intake manifold is leaking — coolant or vacuum leaks can overheat the engine, stall it, or wreck it — get it fixed ASAP.
Short trips might be okay if nothing’s leaking and the engine runs fine, but the risk goes up every mile. A cracked manifold lets unmetered air sneak in, which throws off the fuel mix and can toast the catalytic converter. Spot coolant under the car or smell it inside? Park it and check the manifold and gaskets right away.
How do I know if my intake manifold is bad?
Watch for rough idling, engine misfires, coolant leaks, overheating, and milky oil from coolant mixing — these usually creep up slowly.
- Listen for odd ticking or tapping from the engine bay, especially when it’s cold
- White smoke from the exhaust means coolant’s burning in the cylinders
- Coolant disappearing without visible leaks? Could be leaking inside
- Check Engine Light plus codes like P0171, P0300, or P1077
Give the manifold and gaskets a regular once-over. A flashlight and mirror help spot cracks or warping in those hard-to-see spots under the intake.
Can I drive with P2015 code?
You can usually limp along with a P2015 for a little while, but don’t push it — if the IMRC flap’s stuck open, the engine might run poorly or overheat.
This code means the intake manifold runner position sensor in Bank 1 is out of whack. Driving with P2015 hurts fuel economy and power. If the flap’s jammed open because the linkage or motor’s broken, don’t drive it — the flap can smack the intake valves and trash the engine. Get it scanned and fixed pronto.
How much does it cost to replace an intake manifold runner control?
Replacing the IMRC motor and its linkage usually runs between $250 and $600 total, parts and labor included.
| Component | Cost Range | Notes |
|---|
| IMRC motor (actuator) | $120–$250 | Stick with OEM parts; aftermarket ones tend to die fast |
| Intake manifold runner control linkage | $40–$100 | Often sold as a kit with the motor |
| Labor | $90–$250 | Depends on the car; some need the intake removed |
Parts alone will set you back about $160–$350, with labor adding another $90–$250. Dealerships charge more than independent shops. Always swap both the motor and linkage together — mixing old and new parts rarely ends well.
How do I fix code P2004?
To clear a P2004, you’ll likely need to replace the IMRC solenoid or fix damaged wiring and connectors — sometimes just cleaning corroded connectors does the trick.
- Check that the IMRC motor and solenoid move freely and get the right voltage
- Look for frayed wires, breaks, or shorts in the harness near the intake manifold
- Test the solenoid connector for corrosion or bad pin contact; hit it with contact cleaner
- Replace the solenoid or motor if it’s dead or won’t respond
Use a scan tool to watch the IMRC in action before and after the fix. Some vehicles need a relearn procedure afterward.
How long can you drive on a bad intake manifold?
If the leak’s minor and the engine isn’t overheating or stalling, you might get a few weeks to a couple months out of it — but any coolant loss or rough running means park it immediately.
A tiny vacuum leak might not bother the car much for a while. Trouble is, internal coolant leaks can turn your oil into a frothy mess and trash the engine fast. Overheating, white smoke, or coolant in the oil? Pull over and figure out what’s wrong. Don’t bet on short-term fixes — small leaks love to turn into big ones.
How much does it cost to fix intake manifold?
Fixing or replacing an intake manifold usually costs between $400 and $800 total — labor’s the biggest chunk of that bill.
| Service | Cost Range | Details |
|---|
| Intake manifold gasket replacement | $250–$500 | Common fix; you’ll need to pull the intake and reseal everything |
| Full intake manifold replacement | $500–$900 | Only if the manifold’s cracked or warped beyond saving |
| Labor | $300–$500 | Includes pulling the intake, cleaning surfaces, and torquing bolts to spec |
| Parts | $80–$300 | Gasket set, manifold, bolts, and seals |
Prices swing wildly depending on the car and shop. Always grab high-quality gaskets like Fel-Pro or OEM to dodge repeat leaks. Some cars make you remove half the engine bay to get at the manifold — block off a full day if you’re doing this at home.
What does a bad manifold sound like?
A failing intake manifold often hisses, ticks, or taps when you start it cold — that’s usually the vacuum or air sneaking past the gasket or runner control.
The noise often fades as the engine warms up and the gasket expands. A cracked manifold can also whistle under acceleration. Don’t assume it’s just valvetrain noise — a stethoscope or long screwdriver helps pinpoint where it’s coming from. A pro leak-down test can confirm if the manifold’s the culprit.
What are signs of a bad head gasket?
Look for white exhaust smoke, coolant mixing with oil, overheating, bubbly radiator, and mystery coolant loss — these scream that the head gasket’s toast.
- Milky brown or foamy oil on the dipstick (coolant’s in the oil)
- Coolant in the oil or oil in the coolant tank
- Engine overheats even when the coolant’s full
- Exhaust bubbles in the radiator or overflow tank
Head gasket failure isn’t something to mess with — it can destroy the engine in a hurry. See these signs? Park it and get it checked ASAP. A compression test or leak-down test usually nails the diagnosis.
How long does it take to replace an intake manifold?
In a shop, expect 3 to 6 hours for a manifold replacement — at home, plan on 5 to 8 hours depending on how cramped the engine bay is.
A simple gasket swap on a V6 might take 4–5 hours, but a full manifold replacement on a tight transverse engine can mean dropping the intake, throttle body, and accessories. Crowded engine bays add hours to the job. If you’re tackling this at home, block off a full day and leave extra time for cleaning mating surfaces and torquing bolts correctly.
How do I fix code P2015?
Clearing P2015 usually means replacing the intake manifold runner position sensor on Bank 1 and checking the wiring for damage or corrosion — the sensor’s feedback is critical for IMRC operation.
- Find the sensor on top of the intake manifold, near the IMRC motor
- Unplug the connector and remove the sensor (usually one bolt holds it)
- Drop in the new OEM sensor and reconnect the harness
- Clear the code and do a system relearn if the manual says to
Test the sensor’s voltage and ground with a multimeter before swapping it in. After repairs, watch the IMRC system with a scan tool to make sure it’s behaving.
Where is the intake manifold runner position sensor Bank 1?
The Bank 1 intake manifold runner position sensor sits on top of the intake manifold, between the cylinder heads — it tracks where the IMRC flaps are.
Bank 1 is the side with cylinder 1 — double-check your manual to be sure. The sensor bolts to the manifold near the IMRC motor and plugs in with a 2- or 3-pin connector. On some cars, you’ll need to remove the engine cover or air intake to reach it.
How much does it cost to replace an intake manifold runner control?
Replacing the intake manifold runner control typically costs between $427 and $558 total — labor runs $334 to $423 while parts cost $93 to $135.
Edited and fact-checked by the FixAnswer editorial team.
