Fixed | P306d Peugeot

Do not rely on a generic OBD-II scanner. Use a capable diagnostic tool (like Diagbox, Autel, or similar) to read all ECU fault codes. Note every stored and pending code. The presence of P0171, P0172, or P00BC provides crucial clues about the nature of the underlying problem.

The most frequent "hidden" culprit is a failing EVAP canister purge valve .

than the computer expects, you likely have a sensor or valve issue. The Component Swap : If cleaning the throttle doesn't work, many owners on the French Car Forum recommend checking the purge valve of the EVAP system. Recalibration p306d peugeot fixed

: Inspect the electronic throttle housing for contamination or sensor failure. Some community guides suggest cleaning the internal pins of the Throttle Position Sensor (TPS) to remove corrosion, which can restore a good connection. Inspect the EVAP Canister

Result: connectors were corroded; cleaning improved communication but didn’t fully fix it. Do not rely on a generic OBD-II scanner

Clean the throttle housing and perform a using a scanner. P306D-22 coherence problem - French Car Forum

Over time (often between 50,000 and 75,000 km), carbon deposits and oil residue from the engine's crankcase ventilation system build up inside the throttle body housing. This sticky residue interferes with the movement of the throttle plate, leading to a discrepancy between the commanded position and the actual position. The presence of P0171, P0172, or P00BC provides

The exact manufacturer definition for this code is

Connect an advanced diagnostic scanner (such as a factory Peugeot Diagbox system or a high-end OBD2 tool running Car Scanner). Monitor the live data streams for the and the Inlet Manifold Pressure (MAP) while idling and under load. Check if the MAP values react dynamically to throttle movements or if they stay frozen. Step 2: Inspect and Replace the EVAP Purge Solenoid Valve