The engine control module (ECM) uses the ignition 1 voltage circuit to monitor system voltage. Voltage that is out of range will cause damage to components and incorrect input readings.

The ECM detects an open or a short to ground on the Ignition 1 Voltage Circuit.

DTC P2533 is a Type B DTC.

DTC P2533 is a Type B DTC.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, observe the scan tool ignition 1 data parameter. The reading should indicate the circuit is active.
2. Observe the DTC information with a scan tool. DTC P2533 should not set.
3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

1. Ignition OFF, disconnect the ECM harness connector X1.
2. Ignition ON, test for battery voltage on the ignition 1 voltage circuit terminal X1-28.

⇒	If less than the specified range, test the ignition 1 voltage circuit for an open or a short to ground.

3. Verify a test lamp illuminates between the ignition 1 voltage circuit terminal X1-28 and ground.

⇒	If the test lamp does not illuminate, repair the ignition 1 voltage circuit for a high resistance.

4. If the circuit test normal, test or replace the ECM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM replacement, setup, and programming