Skip to content
Book on WhatsApp

P23CD

Fuel Heater Control Module Feedback Signal Open

The feedback line from the fuel heater control module to the ECM - reporting heater status - is open.

  • Check engine light: Yes
  • Emissions related: No
  • Repair difficulty: medium

Common causes

Ordered by how often each turns out to be the cause.

  • Open in feedback wiringCommon

Parts involved

  • Fuel Heater Control Module

P23CD is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.