GM Service Manual Online
For 1990-2009 cars only

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 C0895: Device Voltage

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

B+

C0895

C0895

--

--

Ground

--

C0895

--

--

Circuit/System Description

Voltage is supplied to the electronic suspension control (ESC) module through the battery positive voltage circuit. The ESC module monitors the supplied voltage to determine if it is within a valid operating range.

Conditions for Running the DTC

Ignition is ON.

Conditions for Setting the DTC

The DTC is set when the battery voltage is outside the normal range of 9-15.5 V.

Action Taken When the DTC Sets

    • The electronic suspension control system (ECS) is disabled for the duration of the ignition cycle.
    • The TCS indicator illuminates on the IPC.
    • The DIC displays the Service Stability System message, if equipped.
    • Disable All Functionality

Conditions for Clearing the DTC

The DTC is saved as history when the ESC module no longer sees battery voltage outside the normal range of 9-15.5 V. The DTC will clear if the fault does not return after 50 consecutive ignition cycles.

Diagnostic Aids

    • A high or low voltage DTC set in multiple modules indicates a concern in the charging system.
    • A possible cause of this DTC could be overcharging with a battery charger or jump starting.
    • A high or low voltage value in multiple modules indicates a concern in the charging system.

Reference Information

Schematic Reference

Electronic Suspension Control Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Electronic Suspension Control Description and Operation

Electrical Information Reference

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

Scan Tool Reference

Control Module References for scan tool information.

Circuit/System Verification

  1. Engine running measure and record the voltage at the battery terminals.
  2. Verify that the battery voltage is 12.6-15.5 V.
  3. If the battery voltage is not within the specified range, refer to Charging System Test
  4. Engine running, observe the scan tool ESC Battery Positive Voltage parameter.
  5. Verify that the scan tool displays a value that is within 2 V of the battery terminal voltage.

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the ESC module.
  2. Ignition OFF, test for less than 5 Ω between the ground circuit terminal 47 and ground.
  3. If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 32 and ground.
  5. If the test lamp did not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  6. If all circuits test normal, replace the ESC module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ESC module replacement, setup and programming