GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2007 🢒 Captiva 🢒 Safety and Security 🢒 Supplemental Inflatable Restraints 🢒 DTC P2533

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    •  Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC P2533: Ignition 1 Switch Circuit

DTC P2533 06: Ignition 1 Switch Circuit Short to Ground or Open

Circuit/System Description

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.

Conditions for Running the DTC
    • The ignition is ON.
    • The DTC runs once per ignition cycle once the above condition is met.

Conditions for Setting the DTC

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

Action Taken When the DTC Sets

DTC P2533 is a Type B DTC.

Conditions for Clearing the DTC

DTC P2533 is a Type B DTC.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

    •  Engine Control Module Connector End Views
    •  Engine Controls Connector End Views

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

    •  Scan Tool Data List
    •  Scan Tool Data Definitions
    •  Scan Tool Output Controls

Circuit/System Verification
  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.

Circuit/System Testing
  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.
    3. ⇒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.
    4. ⇒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.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM replacement, setup, and programming