2016 Volkswagen Golf 2.0 TDI P2564 Fault: Position Sensor Circuit Low - Wiring Diagnosis & Repair Guide
I am experiencing fault code P2564 (Position Sensor Circuit Low) on my 2016 Volkswagen Golf 2.0 TDI. The control sensor wires are labeled 1-2-3 and colored brown, green, and white respectively. I would like to know which of these wires are live under normal operating conditions, and whether the position sensor can be tested using a multimeter. The car originally came with this fault after being declared a 'CAT D' total loss. I have already cleared several other faults caused by damaged wiring in the main engine front loom — specifically where the radiator was crushed during the accident. The front end has since been rebuilt, and now I'm wondering if I may have missed any additional damaged wires. Does the position sensor wiring run through the front engine loom? If so, identifying this path would help me decide whether to strip the front end again for a thorough inspection. Any advice or technical details on how to diagnose or test this fault would be greatly appreciated. Thank you, Graham
A reliable starting point is always to check for Technical Service Bulletins (TSBs) specific to your vehicle. The P25604 fault may be a known issue with an official manufacturer fix — this can save significant time and cost during diagnosis. Locate the TBCPS (Turbo Boost Control Position Sensor) on your 2016 Golf 2.0 TDI, which is typically mounted directly onto the turbocharger housing. Once located, visually inspect the connector and wiring for signs of damage such as rubbing, bare wires, burn spots, or melted plastic. Carefully disconnect the sensor connector and examine the internal terminals (metal contacts) for corrosion — a green tint or burning indicates oxidation. If needed, clean the terminals using electrical contact cleaner and a plastic-bristle brush. Allow them to dry completely before reapplying electrical grease at the terminal connections. For reference diagrams and wiring schematics, visit trusted automotive resources such as Bbbind.com.