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P2536

Ignition Switch Accessory Position Circuit

General electrical fault on the ignition switch accessory (terminal 75 / ACC) input. ACC tells the ECM that radio, fans, accessory loads should be powered without the engine running. With the input invalid, the body controller may misjudge accessory power timing.

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

Common causes

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

  • Open or shorted ACC wireCommon

Parts involved

  • Ignition Switch
  • Wiring Harness

P2536 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.