What Does P2018 Mean?
DTC P2018 indicates the intake manifold runner position sensor signal on bank 1 is exhibiting intermittent behavior. The ECM has detected momentary dropouts, spikes, or erratic fluctuations in the sensor signal that do not correspond to actual runner movement. This code often indicates a developing wiring or connector issue that has not yet become a constant fault.
Common Causes
35%
Loose or worn connector at the IMRC position sensor on bank 1
25%
Intermittent break in the sensor signal wire due to flexing or vibration
20%
Corroded connector pins creating intermittent contact
15%
Failing IMRC position sensor with internal intermittent fault
5%
Loose ECM connector pin on the sensor input channel
Diagnostic Steps
1
Monitor the IMRC position sensor PID on a live scan tool graph; look for sudden spikes or dropouts that do not correlate with runner movement.
2
Wiggle the IMRC position sensor connector and harness while watching the PID for signal interruption.
3
Inspect connector pins for signs of corrosion, green oxidation, or pin spread that could cause intermittent contact.
4
Flex the wiring harness along its length while monitoring the signal for breaks induced by movement.
5
If the fault cannot be reproduced but the code recurs, replace the sensor connector or the sensor itself as a preemptive repair.
Estimated Repair Cost
$60 - $350
Parts + labor, varies by vehicle and location
DTC P2018 indicates the intake manifold runner position sensor signal on bank 1 is exhibiting intermittent behavior. The ECM has detected momentary dropouts, spikes, or erratic fluctuations in the sensor signal that do not correspond to actual runner movement. This code often indicates a developing ...
The most common cause of P2018 (Intake Manifold Runner Position Sensor/Switch Circuit Intermittent Bank 1) is: Loose or worn connector at the IMRC position sensor on bank 1
Typical repair costs for P2018 range from $60 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Minimal safety concern. Intermittent position feedback may cause momentary IMRC control lapses but does not affect vehicle safety. Address when convenient to prevent progression.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2018 to identify the root cause.
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Quick Info
Category
Powertrain
System
Intake / Fuel Management
Difficulty
Type
Generic (SAE)
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