OBD-II Code P2564 — What It Means & How to Fix It

What it means

P2564 means the turbo vane position sensor is reporting a voltage that is too low — typically caused by a short to ground or a failing sensor.
The ECM loses accurate feedback on where the turbo vanes are positioned.
This can result in limp mode, reduced power, or poor fuel economy.

Affected Models

All turbocharged vehicles 1996+
Common in Ford Power Stroke diesel trucks
Common in GM Duramax diesel trucks
Common in VW/Audi TDI diesel vehicles
Common in Dodge/Ram Cummins diesel trucks

Common Causes

Short to ground in the vane position sensor signal wire
Failed sensor with an internal short causing low output
Corroded sensor connector reducing signal voltage
Poor ground connection at the turbocharger assembly
Carbon-jammed vanes causing the sensor to read a minimum position

How to Fix It

Inspect the sensor wiring harness for chafing or shorts against the engine or chassis.

The harness runs close to the turbo and hot exhaust components — heat damage causing a short to ground is a common failure mode.
Clean the sensor connector pins and apply dielectric grease.

Corrosion on the connector pins can cause a low or unstable voltage signal — cleaning and protecting them is a quick first step.
Measure sensor output voltage with a multimeter — compare to published specification.

The sensor should output a voltage within a specific range (typically 0.5–4.5V).
A reading near zero with the engine running confirms a fault.
Check if turbo vanes are mechanically stuck and clean if needed.

Mechanically jammed vanes will force the sensor to read a minimum position — cleaning the vanes can resolve the code without replacing the sensor.
Replace the position sensor if voltage remains low after wiring and vane checks.

If wiring and vanes check out fine, the sensor itself has an internal failure and needs replacement.

When to Call a Professional

If the vehicle is in limp mode or producing excessive smoke, stop driving and get a diagnosis.
A technician will use a scan tool to compare commanded vs. actual vane position and test circuit resistance.
Sensor or actuator replacement typically costs $200–$600 depending on the vehicle.

Frequently Asked Questions

Will P2564 put my car in limp mode?

Very possibly.
Many vehicles with turbo sensor faults enter limp mode to protect the engine from uncontrolled boost.
Power will be significantly reduced until the fault is repaired.
Some vehicles allow normal operation with reduced performance.

How do I check for a short to ground?

Disconnect the sensor and check resistance between the signal wire and a known chassis ground.
A reading near zero ohms confirms a short to ground.
Then trace the wire visually to find where the insulation is damaged.

Is P2564 worse than P2563?

P2563 is a general circuit fault that could be high or low.
P2564 is more specific — it tells you the circuit is reading low, which points to a short or a failed sensor.
This actually makes diagnosis easier and faster.