GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2006 🢒 Equinox 🢒 Vehicle Control Systems 🢒 Computer/Integrating Systems 🢒 DTC P2535

Circuit Description

The powertrain control module (PCM) monitors its ignition 1 voltage circuit. The PCM compares the ignition 1 voltage with the body control module (BCM) Class 2 serial data power mode message. If the ignition 1 voltage signal is detected high while in Off Awake or RAP power modes the PCM will set DTC P2535. The DTC P2535 is a type C DTC. Refer to Diagnostic Trouble Code (DTC) Type Definitions in Engine Controls - 3.4L for more information about DTC types.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P2535 Ignition 1 Switch Circuit High Voltage

Conditions for Running the DTC
    • The vehicle is in PARK or NEUTRAL
    • The ignition switch is OFF

Conditions for Setting the DTC

The ignition 1 voltage signal is higher than normal for more than 7 seconds.

Action Taken When the DTC Sets

The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.

Conditions for Clearing the DTC

A current DTC clears when the malfunction is no longer present.

Step

Action

Yes

No

Schematic Reference: Power Distribution Schematics in Wiring Systems.

Connector End View Reference: Master Electrical Component List in Wiring Systems.

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

  1. Turn OFF the ignition.
  2. Disconnect the powertrain control module (PCM).
  3. Connect a test lamp between the ignition 1 voltage circuit at the PCM connector and a good ground.

Does the test lamp illuminate?

Go to Step 3

Go to Step 5

3
  1. Disconnect the ignition switch.
  2. Connect a test lamp between the ignition 1 voltage circuit at the PCM connector and a good ground.

Does the test lamp illuminate?

Go to Step 4

Go to Step 7

4

Repair the short to voltage on the ignition 1 circuit voltage. Refer to Wiring Repairs and Connector Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 9

--

5

Inspect for a poor connection at the harness connectors of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 9

Go to Step 6

6

Replace the PCM. Refer to Control Module References for replacement, setup and programming.

Did you complete the replacement?

Go to Step 9

--

7

Inspect for poor connections at the ignition switch harness connectors. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 9

Go to Step 8

8

Replace the ignition switch. Refer to Ignition and Start Switch Replacement in Steering Wheel and Column.

Did you complete the replacement?

Go to Step 9

--

9
  1. Reconnect all components.
  2. Use the scan tool in order to clear DTCs.
  3. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK