Meaning
The PCM (Powertrain Control Module) detects an abnormal signal from the ignition switch position circuit, outside of manufacturer specifications. This circuit informs the PCM of the contact status (“ON,” “START,” “ACC,” etc.).
Possible Causes
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Ignition switch failure:
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Internal mechanical wear or electronic malfunction.
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Wiring issues:
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Cut or shorted wiring harness (to ground or another source).
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Corroded, loose, or oxidized electrical connections.
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Connection fault:
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Bent, broken, or improperly engaged connector pins.
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Symptoms
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⚠️ Malfunction Indicator Lamp (MIL) illuminated.
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Possible observations:
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Intermittent starting problems.
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Abnormal behavior of accessories (headlights, radio).
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Repair Procedures
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Visual inspection (priority):
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Check the cable harness between the ignition switch and the PCM.
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Examine the connectors:
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Look for corroded, bent, or broken pins.
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Check for absence of moisture/oxidation.
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Electrical tests:
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Continuity: Test for absence of breaks in the relevant circuits.
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Short circuits: Verify wire insulation (no contact with ground/other circuits).
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Power supply: Measure the input/output voltage of the switch.
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Switch inspection:
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Test its internal resistance according to manufacturer specifications.
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Replace if defective (common solution).
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Reset:
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Clear the code after repair with an OBD-II tool.
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Verify it does not reappear after 1-2 driving cycles.
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Key Points
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90% of cases: Connectivity or wiring issues (corrosion/damaged wire).
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Quick solution: Clean connectors or replace the switch.
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Warning: Do not ignore this code – it can cause random starting issues or vehicle immobilization.