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

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

1. Ignition ON, observe the scan tool ignition 1 data parameter. The parameter should indicate the circuit is active.
2. Observe the DTC information with a scan tool. DTC P2533 should not set.
3. If the vehicle passes the Circuit/System Verification test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records List.

1. Ignition OFF, disconnect the ECM harness connector X1.
2. Ignition ON, measure the voltage on the ignition 1 voltage circuit terminal X1-28. The DMM should display battery voltage.

⇒	If less than the specified range, test the 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 circuit for a high resistance.

4. If the circuit/connections test normal replace the ECM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM replacement, setup, and programming