Code 09D1 specifically points to a . The ECU monitors voltage on the pump control line. If it sees voltage outside the expected range (e.g., 0V when it expects 12V, or 12V when it expects 0V), it logs 09D1.
Let’s break it down.
The 09D1 was effectively shelved, deemed too risky for a fragile market. The mantle of flagship was eventually passed to the DS 5LS and later, the ill-fated second-generation Citroën C6 (which was largely a re-bodied Peugeot 408 for the Chinese market). citroen 09d1