Code P1077 is a trouble code that pops up when the intake manifold runner control system fails at low RPM — it's most common in Honda CR-V models from 2002 to 2016, and happens when the engine control module notices the IMRC flaps aren't moving when they should.
What can a bad intake manifold runner control cause?
A failing IMRC usually brings rough idling, sluggish acceleration, power loss, engine hesitation, and a flashing check engine light — all signs the airflow through the intake manifold isn't right.
You'll probably notice the throttle feels dead when you're trying to merge onto highways or climb hills. Leave a stuck flap unchecked long enough, and it can wreck intake valves or even bend pushrods in interference engines. Most fixes involve swapping the IMRC motor, solenoid, or scrubbing corrosion off the harness connections.
What is intake runner control?
Intake runner control (IMRC) is a system that uses little motorized flaps to switch between two intake paths inside the manifold — it's all about balancing low-RPM torque against high-RPM horsepower.
At idle and low speeds, those flaps close off a bit to boost torque. When you're cruising at higher RPMs, they swing open wide to gulp in as much air as possible. You'll find this setup in plenty of modern inline-4 and V6 engines, including Honda's K-series and J-series platforms. The engine control module (ECM) constantly adjusts flap positions based on what the sensors are feeding back and what you're doing with the pedal.
Can I drive my car with a bad intake manifold?
Don't even think about driving if your intake manifold is cracked or leaking — coolant or vacuum leaks can fry your engine, stall it out, or wreck it from the inside out, so tow it if you have to.
A tiny vacuum leak might let you limp to the shop, but coolant mixing with oil or sneaking into the combustion chambers needs instant attention. Keep an eye out for milky oil on the dipstick, exhaust that smells sickly sweet, or coolant disappearing without any obvious leaks. A cracked manifold usually means full replacement, while a leaking gasket might just need a fresh seal.
How do I know if my intake manifold is bad?
Watch for rough idling, engine misfires, overheating, coolant disappearing, white exhaust smoke, and oil that looks milky from coolant mixing — these problems creep up slowly and get worse over time.
- Listen for ticking or tapping near the intake, especially when the engine is cold
- Check the dipstick and oil fill cap for milky residue that means coolant's in the oil
- Look around the manifold and intake ports for any coolant leaks
- Keep an eye on the Check Engine Light and codes like P0171, P0300, or P1077
Shine a flashlight on the manifold and gaskets to spot cracks or warping. If you find coolant under the car or smell it inside the cabin, don't wait — get it sorted before the engine takes a beating.
Can I drive with P2015 code?
You can limp along for short trips with a P2015 code, but skip the long hauls or heavy loads — the intake manifold runner position sensor issue can leave you with lousy performance and an overheating engine.
This code means the IMRC flap in Bank 1 isn't moving like it should, which throws off the airflow and fuel delivery. If the flap's stuck open, expect power loss and overheating. If it's jammed shut, you'll get brutal power loss and a rough idle. Keep driving with a stuck flap and you risk wrecking intake valves or even bending pushrods in interference engines. Get it checked and fixed within a week to avoid bigger headaches.
How much does it cost to replace an intake manifold runner control?
Swapping the IMRC motor and linkage usually runs between $250 and $600 all-in, with parts and labor included.
| Component | Cost Range | Notes |
|---|
| IMRC motor (actuator) | $120–$250 | OEM parts last longer; aftermarket actuators tend to crap out sooner |
| IMRC linkage kit | $40–$100 | Usually sold as a kit with the motor; includes pivot arms and hardware |
| Labor | $90–$250 | Depends on the car; some models need the intake out of the way to get at it |
Parts alone will set you back about $160–$350, with labor adding another $90–$250. Dealerships love to charge more than independent shops. Always replace both the motor and linkage together — mixing old and new parts usually doesn't fix the problem for good.
How do I fix code P2004?
Fixing a P2004 code usually means replacing the IMRC solenoid, cleaning up corroded connectors, or repairing damaged wiring — sometimes a shot of contact cleaner or some harness repairs do the trick.
- Check the IMRC motor and solenoid to make sure they move freely and get the right voltage
- Inspect the wiring harness near the intake manifold for frayed wires or breaks
- Hit the corroded solenoid connectors with electrical contact cleaner
- Test the solenoid's resistance; swap it if it's out of whack
Use a scan tool to watch the IMRC operation before and after you fix it. Some vehicles need a relearn procedure after you swap the solenoid — check your service manual or ask a pro.
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 away with driving for a few weeks to a couple of months — but any coolant loss, rough running, or overheating means park it ASAP.
A small vacuum leak might not cause trouble right away, but internal coolant leaks can turn your oil into a frothy mess and trash internal parts fast. Overheating, white smoke from the exhaust, or coolant mixing with oil are red flags to stop driving. Even small leaks tend to get worse over time — don't count on stop-leak products to fix internal coolant leaks.
How much does it cost to fix intake manifold?
Repairing or replacing an intake manifold usually costs between $400 and $800 total — labor's the big expense because getting it in and out is a pain.
| Service | Cost Range | Details |
|---|
| Intake manifold gasket replacement | $150–$350 | New gaskets and seals; you don't have to remove the manifold |
| Intake manifold replacement | $400–$800 | New manifold, gaskets, and labor; might need to pull the intake out of the way |
| Labor (per hour) | $100–$150 | Varies by shop; dealerships charge more than independents |
Labor alone can take 3–6 hours, depending on how your engine's put together and how easy it is to get at. Gasket replacement is cheaper but might not fix deeper issues. If the manifold's cracked or warped, you'll need a new one. Always use top-notch gaskets and seals to keep leaks from coming back.
What does a bad manifold sound like?
A failing intake manifold usually sounds like ticking, tapping, or whirring coming from the engine bay — these noises typically come from near the intake ports or the IMRC motor.
The racket often stands out at idle or when the engine is cold. A stuck IMRC flap can make a rhythmic buzzing or whirring as the motor tries to move but can't. If you hear loud ticking that changes with RPM, it might mean a vacuum leak or a cracked manifold. Ignore these sounds and you're asking for more damage, so get it looked at if the noise won't quit.
What are signs of a bad head gasket?
Common symptoms include overheating, white exhaust smoke, milky oil, coolant disappearing without leaks, and a rough-running engine — these usually show up together.
- Coolant in the oil (milky residue on dipstick or under oil fill cap)
- White smoke from the exhaust (coolant burning in the cylinders)
- Overheating with no visible coolant leaks
- Exhaust gases in the coolant reservoir (bubbles or overflow)
- Check Engine Light with codes like P0300 or P0420
If you think the head gasket's toast, stop driving immediately to avoid total engine failure. A compression test or leak-down test can confirm it. Replacing a head gasket usually costs $1,200–$2,500, depending on the car and labor rates.
How long does it take to replace an intake manifold?
Replacing an intake manifold usually takes 3 to 6 hours of labor — the exact time depends on how the engine's laid out, how easy it is to get at, and whether you need to move other parts out of the way.
Swapping just the gasket might take 1–2 hours, while a full manifold replacement on a V6 or V8 can run 4–6 hours. Dealerships often quote longer times because of diagnostics and warranty stuff. Independent shops might finish faster, especially if they know your engine well. Always build in extra time for letting the engine cool and draining fluids before you start.
How do I fix code P2015?
To fix a P2015 code, check and replace the IMRC motor, linkage, or position sensor in Bank 1 — sometimes cleaning up corroded electrical connections does the trick.
- Use a scan tool to watch the IMRC operation and confirm the code
- Check the IMRC motor and linkage for binding or damage
- Inspect the position sensor wiring for corrosion or breaks
- Replace the motor, linkage, or sensor as needed; do a relearn if the manual says so
If the motor's seized, the linkage might be broken or disconnected. Always replace both the motor and linkage together to make sure everything works right. Some vehicles need a relearn after replacement — check your service manual or ask a pro.
Where is the intake manifold runner position sensor Bank 1?
The intake manifold runner position sensor for Bank 1 is usually mounted on or near the intake manifold — exactly where it sits depends on how your engine's put together.
- Inline-4 engines: Sensor is often on the side or top of the intake manifold, near the IMRC motor
- V6 engines: Sensor is usually in the intake manifold's valley (between the cylinder heads) or on the side of the manifold
- You might need to remove the engine cover, air intake, or other parts to get at it
Your vehicle's service manual has the exact location. The sensor is usually a small, rectangular box with a wiring harness connector. If you're not sure, a pro can find it fast with a scan tool and wiring diagram.
How much does it cost to replace an intake manifold runner control?
Replacing the intake manifold runner control (motor and linkage) usually costs between $250 and $600 total — parts and labor included.
The IMRC motor alone runs about $120–$250, while the linkage kit adds another $40–$100. Labor varies from $90–$250, depending on how easy it is to get at the parts. Dealerships charge more than independents. Always replace both the motor and linkage together to make sure it works right. If the problem sticks around after replacement, check the wiring harness and connectors for corrosion or damage.
