GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2000 🢒 Chevy K Silverado - 4WD 🢒 DTC 🢒 DTC C0362 4LO Discrete Output Circuit High

Circuit Description

The 4WD LO Circuit is used to notify the vehicle control module (VCM)/powertrain control module (PCM) that the vehicle is in 4WD low range. VCM/PCM supplies 12 V to this circuit. The transfer case shift control module grounds this circuit when the vehicle is in 4WD low range.

This DTC detects an transfer case shift control module problem, a short to voltage on the 4WD LO Circuit.

Conditions for Setting the DTC
    • After the transfer case shift control module grounds the 4WD LO Circuit and reads back a high voltage, the DTC is set. The system will not attempt it again during that ignition cycle.
    • The transfer case shift control module reads back a high voltage when a low voltage is expected on the 4 LO Circuit.

Action Taken When the DTC Sets
    • May affect the transmission shift points.
    • The SERVICE indicator (AWD/4WD) lamp will be latched on for the remainder of the current ignition cycle.

Conditions for Clearing the DTC
    • The transfer case shift control module will clear the DTC if the condition for setting the DTC no longer exits.
    • A history DTC will clear after 100 consecutive ignition cycles without a fault present.
    • History DTCs can be cleared using a scan tool.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. Tests the 4WD LO circuit for voltage.

    2.

  2. Tests the 4WD LO circuit for a short to voltage.

    3.

  3. Tests the 4WD LO circuit for an open or high resistance.

    4.

  4. Repairs the 4WD LO circuit for a short to voltage.

DTC C0362 4LO Discrete Output Circuit High

Step

Action

Value(s)

Yes

No

Schematic Reference: Transfer Case Control Schematics

Connector End View Reference: Transfer Case Control Connector End Views

1

Was the Transfer Case Diagnostic System Check performed?

--

Go to Step 2

Go to Diagnostic System Check

2

  1. Turn the ignition OFF.
  2. Disconnect the transfer case shift control module.
  3. Connect a DMM between the 4WD LO circuit and ground.
  4. Turn the ignition ON with the engine OFF.

Does the DMM indicate battery voltage?

--

Go to Step 3

Go to Step 4

3

  1. Turn the ignition OFF.
  2. Disconnect the powertrain control module.
  3. Turn the ignition ON with the engine OFF.

Does the DMM continue to display battery voltage?

--

Go to Step 5

Go to Step 7

4

Test the 4WD LO circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Was the condition found and corrected?

--

Go to Step 8

Go to Step 6

5

Repair the 4WD LO circuit for a short to voltage. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 8

--

6

Replace the powertrain control module. Refer to VCM Replacement/Programming for the 4.3L engine, or Powertrain Control Module Replacement for the 4.8L, 5.3L, and 6.0L engine.

Is the replacement complete?

--

Go to Step 8

--

7

Replace the transfer shift case control module. Refer to Transfer Case Shift Control Module Replacement .

Is the replacement complete?

--

Go to Step 8

--

8
  1. Use the scan tool in order to clear the DTCs.
  2. 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