P2536: Ignition Switch Accessory Position Circuit — what it means, the affected system and what to check before replacing parts.
Meaning, symptoms, causes and checks
The definition identifies an electrical condition in the ignition-switch Accessory position circuit. It establishes the monitored circuit, but it does not by itself identify whether the component, connector, wiring, power supply, ground, control command or module input is responsible; circuit layout and diagnostic thresholds are vehicle-specific.
Affected system: Ignition-switch position sensing
Symptoms
- Warning light may illuminate
- Related system function may be impaired
- Vehicle-specific symptoms vary
Possible causes
- Implausible sensor or switch signal, poor ground, connector corrosion, or wiring damage
- Related wiring, connector, power or ground fault
- Vehicle-specific mechanical or control issue
What to check
- Record stored and pending codes and freeze-frame data
- Compare the named sensor or switch signal with actual operating conditions; inspect the connector, reference supply, ground and harness.
- Confirm measured values against the vehicle service information
- Retest under the conditions that set the code
- Compare the named sensor or switch signal with actual operating conditions; inspect the connector, reference supply, ground and harness.
- Repair the verified cause and confirm the code does not return
Also written as: P2536-00, P253600 (some scan tools add the fault-type byte, e.g. -00).