P2018 OBD-II Trouble Code: Intake Manifold Runner Position Sensor/Switch Circuit Intermittent Bank 1

check engine light logo

P2018 trouble code definition

Intake Manifold Runner Position Sensor/Switch Circuit Intermittent Bank 1

What the P2018 code means

P2018 is an OBD-II generic code for the engine control module (ECM) detecting a an intermittent failure in the intake manifold runner position sensor/switch circuit causing the ECM to turn on the Check Engine Light and set the P2018 code.

What causes the P2018 code?

  • The engine control module (ECM) tests the intake manifold runner position on startup to test its operation and monitors the position during vehicle operation and will set a fault code P2018 if the signal return is erratic or intermittent from the sensor.

  • The signal from the intake manifold runner is erratic but still within specification when it works.

What are the symptoms of the P2018 code?

  • The Check Engine Light will be illuminated and the code is set in ECM memory as a fault.
  • The engine may have low power conditions or acceleration issues.
  • The engine miles per gallon may suffer over time.

How does a mechanic diagnose the P2018 code?

  • Scans codes and documents the code in the ECM and look at the freeze frame data for failure

  • Checks the wire connections to the sensor for loose or corroded connections

  • Performs the manufacture pinpoint test on the sensor to verify the failed sensor

Common mistakes when diagnosing the P2018 code

  • Clearing ECM memory codes before checking the freeze frame data, so the failure may be duplicated and repaired

  • Failing to clear the ECM codes after the codes are fixed

  • Replacing parts when the wiring has been rubbing through from a loose harness tie down

How serious is the P2018 code?

Code P2018 is a code for the intake manifold runner sensor not working correctly and the problem may not cause major issues with everyday driving except on acceleration.

What repairs can fix the P2018 code?

  • Replacing the intake manifold runner sensor for bank 1
  • Repairing the wiring harness or connector to sensor
  • Replacing the ECM for an internal faulty circuit

Additional comments for consideration regarding the P2018 code

Code P2018 is to alert you that bank 1 signal is erratic and may not affect the component from working except when the signal is not working. The problem may be very intermittent or may be very often depending on failure.

Need help with a P2018 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

More related articles

How to Buy Fuel Treatments
Adding a fuel additive to your gas tank when you fill up is one way to clean vital engine parts of deposits, improve the performance of your engine,...
How to Transfer a Car Title in Idaho
In order to prove ownership of a car, you must have the title. However, when a car is sold, given away or inherited, the title needs...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...

Related questions

Q: wont go faster 35mph

If the Check Engine Light is on this would be helpful as the codes that would be triggered by this would generate useful information relating to the problem. Without the benefit of hooking the car up to a scanner and...

Q: Trouble running when the engine warms up, dash lights on - 2007 Subaru B9 Tribeca

The P0137/P0157 codes indicate the "rear" (behind the catalytic converters) oxygen sensors are not functioning properly. In turn, they are signaling (incorrectly) for more fuel, which is causing the P0172/P0175 over-rich codes. This is clogging your converters, as well as...

Q: P0446 trouble code

Hi there, thanks for writing in. This P0446 trouble code relates to the evaporation control system circuit, which is a restricted vent path for the EVAP (Emergency Vehicle Accident Prevention) system. There is a solenoid in this circuit that sometimes...