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P2DA7

Coolant Heater A Control Module System Voltage

The system voltage feedback of the coolant heater A control module is outside the expected window.

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

Common causes

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

  • System voltage driftedCommon
  • Feedback wire faultPossible

Parts involved

  • Coolant Heater A
  • Coolant Heater A Control Module

P2DA7 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.