Symptoms
Symptoms of a P2005 code may include:
- Reduced engine performance, especially at low RPM
- Decreased fuel efficiency
- Engine surging
Causes
Possible causes of this engine code include:
- Faulty Bank 2 IMRC actuator solenoid
- Loose or binding intake manifold runners on Bank 2
- Faulty Bank 2 intake manifold runner position sensor
- Open or shorted wiring in the Bank 2 IMRC actuator solenoid control circuit
- Defective MAP sensor
- Corroded IMRC actuator solenoid connector face
Diagnostic and Repair Procedures
When attempting to diagnose a P2005 code, a diagnostic scanner, digital volt/ohmmeter (DVOM), and a reliable vehicle information source such as All Data DIY will be required.
Before beginning your diagnosis, check Technical Service Bulletins (TSBs) for the specific symptoms, stored codes, and vehicle make and model. If a relevant TSB is found, the information it contains may help you diagnose P2005 in your vehicle.
I like to start my diagnosis with a visual inspection of the system wiring and connector faces. It appears that IMRC actuator connectors are prone to corrosion that could cause an open circuit, so pay special attention to these.
Next, I normally connect the scanner to the vehicle’s diagnostic connector and retrieve all stored codes and freeze frame data. I prefer to note this information in case it’s an intermittent code; then I would clear the codes and perform a road test to see if the code resets.
If the code resets, proceed to the IMRC actuator solenoid and IMRC runner position sensor. Consult your vehicle information source for testing recommendations for these components. Using the DVOM, perform a resistance test on both components. If the actuator or position sensor does not meet manufacturer recommendations, replace the faulty part and retest the system.
If both the actuator resistance and sensor resistance are within manufacturer specifications, use the DVOM to test resistance and continuity on all system circuits. To avoid damaging the controller, disconnect all associated controllers before testing. Repair or replace shorted or open circuits as needed.
Additional Diagnostic Notes:
Test IMRC flap binding with actuator disconnected from shaft
The screws (or rivets) that secure the flaps to the shaft may loosen or fall out, causing the flaps to bind
Carbon coking inside the intake manifold walls can cause binding