P1518 Possible Causes
- Faulty Intake Manifold Runner Control (IMRC) actuator
- Intake Manifold Runner Control actuator harness is open or shorted
- Intake Manifold Runner Control actuator circuit poor electrical connection
- Faulty Powertrain Control Module (PCM)
How is the P1518 code repair?
Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.What is the cost to diagnose the P1518 code
Labor: 1.0
The cost to diagnose the P1518 code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
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Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1518 Meaning
The Intake Manifold Runner Control (IMRC) is an electrically actuated system consisting of a motorized actuator with an attaching linkage for each housing on each bank. The linkage attaches to the housing butterfly plate levers. Each IMRC housing is an aluminum casting with two intake air passages for each cylinder. One passage is always open, and the other is opened and closed with a butterfly valve plate. The housing uses a return spring to hold the plates closed. The motorized actuator houses internal switches to provide feedback to the Powertrain Control Module (PCM), indicating linkage and plate position. Under about 3000 rpm, the vacuum solenoid will be energized. This will allow the manifold vacuum to be applied and the butterfly valve plates to stay closed. Above approximately 3000 rpm, the vacuum solenoid will be de-energized. This will allow a vacuum to vent from the actuator and the butterfly valve plates to open. The Diagnostic Trouble Code (DTC) sets when the IMRC is commanded close, but the IMRC monitor indicates open.More Information
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Information for specific makes
- P1518 AUDI Main Relay Circuit Short to B+
- P1518 BUICK Throttle Actuator Control Module Performance
- P1518 CADILLAC Throttle Actuator Control Module Performance
- P1518 CHEVROLET Throttle Actuator Control Module Performance
- P1518 FORD Intake Manifold Runner Control Stuck Open
- P1518 GMC Throttle Actuator Control Module Performance
- P1518 ISUZU Commanded Versus Actual Throttle Position Correlation Large Step Open
- P1518 LINCOLN Intake Manifold Runner Control Stuck Open
- P1518 MAZDA Intake Manifold Runner Control Stuck Open
- P1518 MERCURY Intake Manifold Runner Control Stuck Open
- P1518 SUBARU Starter Switch Circuit Low Input
- P1518 VOLKSWAGEN Main Relay Circuit Short to B+