OBD-II Diagnostic Trouble Code
P2008 — Intake Manifold Runner Control Circuit/Open Bank 1
P2008 means the ECM detected an open or general circuit fault in the intake manifold runner control actuator circuit on bank 1. The ECM could not drive the actuator as expected.
Severity 3/5
Truck-relevant
Service this week
Severity
Service this week
Intake Manifold Runner Control Circuit/Open Bank 1
Code
P2008
Category
Powertrain
Subsystem
Air Flow
Truck-relevant
Yes
What this means for truckers
P2008 (Intake Manifold Runner Control Circuit/Open, Bank 1) — electrical fault in the IMRC actuator circuit. Wiring or actuator failure.
Before you replace parts — try this first
P2008 on the Air Flow system is most often open or damaged actuator wiring — not a dead part. On commercial diesels especially, work these in order before spending money on parts:
- Confirm the symptoms. Match what your truck is doing to the Symptoms section below. If the code is set but the symptoms are not there, clear the code and re-test after a drive cycle — it may not return.
- Clean and dry the sensor connector. Water, road salt, or oil seeping into a connector is the #1 fake sensor failure. Disconnect, look for green corrosion or moisture, spray with electrical contact cleaner, dry, reseat. Many faults clear here for $0.
- Inspect the wiring harness. Trace the wire from the sensor toward the ECM — look for chafing against the engine block, melted insulation near the turbo or exhaust, or pinch points where a clamp has rubbed through.
- Test the sensor before swapping it. Most Common Causes (below) list the expected voltage or resistance range — a $20 multimeter saves a $300 sensor swap that does not fix the problem.
- Only then, replace the part. Use the OEM or a tier-1 aftermarket. Cheap sensors throw the same code in two weeks.
Symptoms
Runner flaps stay in one position, reduced low- or high-rpm power, and a check-engine light.
Common causes
- CommonOpen or damaged actuator wiring ($100–$400)
- CommonCorroded or loose connector ($60–$250)
- OccasionalFailed actuator coil or motor ($200–$700)
- RareECM driver fault ($800–$2500)
How to fix
Check the actuator connector and wiring for opens
When to use: First step
Measure actuator resistance
When to use: When wiring is good
Replace the actuator
When to use: When it is open
Diagnose the ECM driver
When to use: When the actuator and wiring test good
Affects most
No specific vehicle pattern found in our complaint database. This code can appear on any vehicle that supports OBD-II diagnostics.
Related
- → Browse all DTC trouble codes
- → Decode a VIN to check codes for your truck
- → Owner-operator maintenance guides
- → P2002 — Diesel Particulate Filter Efficiency Below Threshold (Bank 1)
- → P2003 — Diesel Particulate Filter Efficiency Below Threshold (Bank 2)
- → P2031 — Exhaust Gas Temperature Sensor Bank 1 Sensor 2
- → P2032 — Exhaust Gas Temperature Sensor Bank 1 Sensor 2 Low
- → P2033 — Exhaust Gas Temperature Sensor Bank 1 Sensor 2 High
Frequently Asked Questions
Can I drive with code P2008?
P2008 is severity 3 — plan service within a few days. Performance is likely degraded already (you may feel reduced power, harsher shifts, or slightly worse fuel economy). Continuing to drive risks additional damage to adjacent components.
How much does it cost to fix P2008 on a commercial truck?
Total repair cost ranges $60–$2500 depending on the root cause. The cheapest fix is usually the first one listed below — Open or damaged actuator wiring — which is also the most common. On commercial trucks the cost is usually higher than passenger vehicles due to part availability and shop labor rates ($120–185/hour at most truck shops, vs $90–130 at general auto shops). DIY-capable fixes (sensors, hoses, filters) are at the low end; major component replacements (turbo actuator, high-pressure fuel pump, transmission solenoid pack) are at the high end. Always diagnose with a scan tool BEFORE replacing parts — guessing wrong on a $1,500 turbo actuator when the actual issue was a $30 boost hose is a common expensive mistake.
Will P2008 fail a DOT inspection?
P2008 is generally not a direct DOT inspection fail item by itself. Inspectors focus on safety-critical systems (brakes, steering, tires, lights, hours-of-service). However, the check engine light alone can trigger additional inspection scrutiny. Best practice: fix the code and clear it before a planned inspection.
What's the difference between P2008 and related codes?
P2008 is closely related to: P2002 (Diesel Particulate Filter Efficiency Below Threshold (Bank 1)), P2003 (Diesel Particulate Filter Efficiency Below Threshold (Bank 2)), P2031 (Exhaust Gas Temperature Sensor Bank 1 Sensor 2), P2032 (Exhaust Gas Temperature Sensor Bank 1 Sensor 2 Low). These codes share the same subsystem (air-flow) and often appear together. If you see this code, scan for the full code list — fixing the root cause usually clears multiple companion codes at once. If only P2008 is set without the companions, the issue is more isolated.
How do I prevent P2008 from coming back after a repair?
For P2008 (Intake Manifold Runner Control Circuit/Open Bank 1), prevention centers on the air flow system. Service air filter on time. Clean MAF sensor at every air filter change. Inspect intake boots/hoses for cracks — vibration kills them eventually.