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P2008

Powertrain
Low

Intake Manifold Runner Control Circuit/Open (Bank 1)

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P2008

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The P2008 code indicates that the powertrain control module (PCM) has detected an open circuit in the intake manifold runner control (IMRC) electrical circuit for bank 1. Unlike codes P2004 or P2006 which indicate the physical runner valves are stuck, P2008 specifically points to an electrical problem — the PCM is unable to communicate with or control the IMRC solenoid due to a break in the circuit.

The IMRC solenoid is typically mounted in a harsh environment on the engine, exposed to high temperatures and road debris. Over time, the solenoid's internal components can fail, its wiring can corrode, or its connector can develop a poor connection. The solenoid also has a small filter screen that can become clogged with dirt.

This code is generally low severity and most drivers will only notice a slight reduction in low-speed engine performance. You can usually continue driving normally while you schedule a repair. Start by inspecting the IMRC solenoid connector for corrosion or damage — a simple connector cleaning or wiring repair may solve the problem without needing to replace any parts.

Severity

Low — MonitorThis Month

Symptoms

  • Check engine light on
  • Slight loss of engine power at low RPMs
  • Minor decrease in fuel economy
  • Engine may hesitate during light acceleration
  • Possible rough idle in some vehicles

Likely Causes

Faulty IMRC solenoid35%

The intake manifold runner control solenoid is positioned in a hot area of the engine bay and is exposed to dirt and heat, which commonly leads to solenoid failure and an open circuit condition.

Damaged or corroded wiring to the IMRC solenoid30%

The electrical wiring or connector leading to the IMRC solenoid can develop corrosion, breaks, or loose connections due to engine heat and vibration, creating an open circuit.

Carbon-clogged swirl flaps or runner valves20%

When the intake runner flaps become covered with soot and carbon deposits, they can seize in position. The actuator may then draw excessive current or the position feedback may indicate a fault, triggering the circuit code.

PCM or ground connection issue15%

A poor ground connection for the IMRC circuit or, in rare cases, a PCM driver failure can prevent the control signal from reaching the solenoid, appearing as an open circuit.

Estimated Cost

DIY Repair

$20$120
Difficulty

DIY Friendly

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Professional Repair

$100$450

Includes parts + labor

Common Fixes

  1. Replace the IMRC solenoid/actuator
  2. Repair or replace damaged wiring and connectors
  3. Clean the IMRC solenoid filter screen
  4. Clean carbon deposits from intake runner valves

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Videos

P2008:Intake Manifold Runner Control Circuit/Open (Bank 1) | Trouble Code: Diagnose Symptom Fix

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