P2011 – Open circuit of intake manifold, row 2

Symptoms

Symptoms of a DTC P2011 may include:

1. The engine may have a rougher idle than normal
2. Sometimes, the engine may tend to surge
3. There may be a slight reduction in low-end torque
4. The fault code P2011 will be displayed
5. This is a “software” code, meaning the check engine light may only flash when the ECM detects the fault. If the fault corrects itself, the light turns off. Hard codes will remain once observed until they are cleared.

Potential Causes

Causes

of this DTC may include:

Over the years, I have found that the intake manifold runner control solenoid is largely the issue. They are almost always located where they are exposed to heat and dirt that clogs the filter and causes them to fail. Secondly, the swirl flaps themselves become coated with soot from the EGR valve and lock in their current position.
The MAF sensor or the EGR have the potential to set this code if they fail, however, they will set their own code to coincide with the P2011 code. In that case, they would be diagnosed and repaired first and the codes cleared

• The intake manifold runner control solenoid
• The swirl flaps are contaminated
• Cracked vacuum lines
• Poor electrical connection
• Open or short circuit in the wiring harness

Diagnosis and Repair

A vehicle service manual and a scan tool will be needed to diagnose and perform a conclusive repair. The ECM uses pulse width modulation to vary the position of the swirl flaps with the intake runner solenoid.

• Check the vacuum hoses and ensure there are no cracks and that they are properly seated.
• Inspect the electrical connector of the solenoid. Look for corrosion or a loose connection.
• Disconnect the solenoid connector and plug the scan tool into the solenoid connector.
• Access the VSV operational check. Turn the key. Operate the solenoid with the scanner by making it open and close. If it does not respond, replace the valve.
• If the valve operates but struggles to move the actuator rod, replace the intake manifold.
• If the solenoid does not operate, disconnect the electrical connector. Look in the main fuse box and pull the EFI relay. Using an ohmmeter, check for continuity between the EFI terminals and the solenoid terminals on the harness side.
• Consult the service manual and locate the ground terminal on the solenoid harness connector and test it for ground.