Technical Description of OBD-II Trouble Code
The circuit for the Intake Manifold Runner Position Sensor / Switch on Bank 1 is experiencing low voltage.
What does that mean?
This generic diagnostic trouble code is applicable to fuel injected engines from various manufacturers since 2003, including Ford, Dodge, Toyota, Mercedes, Volkswagen, Nissan, and Infiniti.
This code specifically relates to the intake manifold flow control valve/position sensor, also known as the IMRC valve/sensor. It is responsible for regulating the amount of air entering the engine at different RPMs. The code is set for Bank 1, which includes cylinder number 1. Regardless of the vehicle manufacturer and fuel system, this code indicates an electrical circuit fault.
The troubleshooting steps may vary depending on the manufacturer, fuel system type, and the specific IMRC sensor and wire colors used.
Symptoms
The symptoms of a P2016 engine code may include:
Causes
The common causes for this code to be set are:
Diagnostic Steps and Repair Information
It is recommended to check for technical service bulletins (TSB) specific to your vehicle as a starting point. This can provide information on known issues and their fixes, potentially saving time and money during diagnosis.
The next step is to locate the IMRC valve/sensor on your vehicle and visually inspect the connectors and wiring. Look for any signs of damage such as rubbing, scraping, bare wires, worn spots, or melted plastic connectors. Disconnect the connectors and examine the terminals inside for any signs of burning or corrosion. If necessary, clean the terminals using electrical contact cleaner or rubbing alcohol and a small plastic bristle brush. Once cleaned, let them air dry and apply dielectric silicone compound to the connector cavity before reassembling.
If you have a scan tool, clear the diagnostic trouble codes from memory and check if the code returns. If it doesn’t, the issue was likely with the connections. If the code does return, further testing of the IMRC valve voltage signals to and from the PCM is necessary. Monitor the IMRC valve voltage using a scan tool or test the signal with a digital volt ohm meter (DVOM). If voltage abnormalities are detected, the corresponding circuit is likely the source of the problem. If the voltage is normal, reconnect the wires to the valve and check the voltage on the ground wire (PCM control wire). If the voltage is abnormal, it indicates a potential open or short in the IMRC valve/solenoid.
If all testing has been passed and the code persists, check if your scan tool can operate the IMRC valve. This can be done through an “Actuator Test”, “Bi-Directional Test”, or “Functional Test” depending on the scan tool and vehicle manufacturer. If the scan tool can operate the valves and the problem is resolved, clearing the code is sufficient. Otherwise, a defective ground circuit or PCM may be the cause.
If the diagnosis process becomes complex or requires the removal of the intake manifold, it is advisable to consult with an automotive professional for assistance.
