P2016 Code: Intake Manifold Position Sensor Circuit Low (Bank 1)
The ECU sees zero voltage from your intake sensor. Is the sensor dead, or is the wire touching the engine block? Let's trace the short.
1. What Does P2016 Mean?
P2016 stands for "Intake Manifold Runner Position Sensor/Switch Circuit Low Bank 1."
The Intake Manifold Position Sensor usually works on a 5V Reference Circuit. The ECU sends out 5 Volts and expects the sensor to return a signal between 0.5V and 4.5V depending on the flap angle.
Circuit Low means the ECU is receiving a signal near 0 Volts. It thinks the sensor wire is "grounded out" or the sensor has completely failed to conduct electricity.
⚡ Specific vs. General Codes
It helps to know how P2016 relates to other Bank 1 sensor codes:
- P2014 (Circuit): A general failure. The signal is erratic or missing. Read P2014 Guide.
- P2016 (Circuit Low): The signal is pegged at 0V (Short to Ground).
- P2017 (Circuit High): The signal is pegged at 5V (Short to Power or Open Ground).
3. Why Is the Voltage Low?
Since this is a "Low Input" code, we are looking for things that pull voltage down to zero:
- Short to Ground (Wiring): The most common cause on older vehicles. The signal wire insulation has rubbed off against a metal engine bracket, grounding the 5V signal directly to the chassis.
- Internal Sensor Short: The sensor's internal resistor track has collapsed or shorted, dropping resistance to zero.
- Corroded Connector: Green corrosion inside the plug can create a bridge between the Signal pin and the Ground pin.
4. Diagnosis: The "Unplug Test"
You can determine if the problem is the Sensor or the Wiring without using a multimeter, just by using your scanner.
Using the iCarsoft CR Ultra P:
- Live Data: Connect the scanner and view Intake Manifold Runner Position Bank 1 (Voltage). It should be reading close to 0V.
- Unplug Sensor: Turn off the engine, open the hood, and disconnect the Bank 1 Position Sensor.
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Check Scanner Again: Turn the key ON.
- Voltage jumps to 5V (or Code becomes P2017/High): This is good! The ECU pulled the voltage up when you disconnected the bad part. The Sensor is faulty. Replace it.
- Voltage stays at 0V (Code stays P2016): This is bad. Even with the sensor gone, the wire is still grounded. The Short is in the wiring harness.
See the Voltage in Real-Time
Don't guess with electrical shorts. The iCarsoft CR Ultra P displays raw sensor voltage, allowing you to perform wiggle tests and unplug tests with confidence.
View Diagnostic Tool6. Frequently Asked Questions
Q: Where is the Bank 1 Position Sensor?
A: It is usually located at the end of the intake manifold runner shaft, or integrated into the vacuum actuator motor itself. Bank 1 is the side with Cylinder #1.
Q: Can I drive with P2016?
A: Yes, but your car will likely be in "Limp Mode" for the intake system. The flaps will stay open, causing poor low-end power and potentially rough idling.
Q: Is this the same as P2015?
A: Close, but different. P2015 is a "Range/Performance" code, meaning the sensor works but gives impossible readings (implausible). P2016 means the sensor is effectively dead (0V).
