P2019: Intake Manifold Runner Position Sensor / Switch Circuit (Bank 2)

This is the general-purpose entry in the bank 2 position sensor set. The module has judged the circuit faulty without committing to a direction — not too low, not too high, not out of range, just wrong. It is stored when the failure does not fit any of the specific descriptions, and it is also the code some manufacturers use in preference to the specific ones regardless of what the signal was doing.

The part of this code worth getting right before anything else is which side of the engine bank 2 actually is. Bank 2 is the cylinder head that does not contain cylinder 1. There is no convention that puts it on the driver's side or the passenger's side; it depends entirely on where the manufacturer decided cylinder 1 lives, and that varies between makes and sometimes between engines from the same make. Confirm it in the service data for the specific engine. Choosing wrong here does not lead to a small error — it leads to disassembling the wrong half of the engine.

On a transverse V engine, bank 2 is very often the rear head, tucked against the firewall under the cowl. That single geometric fact drives everything else about this code. The sensor is harder to see, harder to reach, and harder to backprobe. The harness that serves it is buried where you cannot inspect it visually without removing something. And the labour figure for an identical repair on this bank can be double what the same job costs on the front head. When you price this code, price it as a bank 2 job, not as a runner position sensor job.

The access problem also changes the diagnostic order. On an easy-to-reach sensor you can afford to test, guess, and test again. Here every attempt costs real time, so it pays to extract everything you can from data before you reach for a tool.

The strongest tool you have is one that only exists on a two-bank engine: both banks' position sensors are commanded to the same place at the same instant. Put the two position parameters side by side in live data and sweep the actuators. Two readings that track each other means both sensors are reporting sensibly and the fault is likely intermittent or resolved. One reading that sits still while the other moves localises the fault to that bank definitively, from the driver's seat, with nothing removed.

That comparison tells you something the runner control codes cannot. Control codes report on the drive side of the system. Position sensors report on the result, so watching both at once also reveals whether the two banks' flaps are mechanically in step with each other — a linkage or cross-shaft that has slipped shows up as two readings that move together but no longer agree, which no control-circuit code will ever tell you.

One caveat before you go looking for hardware. Some V engines drive both banks' flaps from a single actuator and cross-shaft, and carry fewer position sensors than the code list implies. If a bank 2 position code appears on a vehicle you cannot find a bank 2 position sensor on, the question is not where the sensor is hiding — it is whether the module is running a calibration that expects hardware this vehicle was never built with, which happens after a module swap or a mistaken software load.