GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2008 🢒 Tahoe - 4WD 🢒 Steering 🢒 Power Steering 🢒 DTC C0460

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 provide overview of each diagnostic category.

DTC Descriptor

DTC C0460 00: Steering Position Sensor

Diagnostic Fault Information

Circuit

Short to Ground

Open or High Resistance

Short to Voltage

Signal Performance

motor position sensor

C0460 00*

C0460 00*

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*After verifying a circuit fault exists in the power steering wiring harness extension harness for two mode hybrid. The wiring harness is to be replaced and not repaired

Circuit/System Description

The power steering control module (PSCM) continuously monitors the position sensor sine wave frequency signals. The sine wave voltage signals of the position sensor and the angle difference between the steering column output and input shafts detected by the torque sensor are both processed by the PSCM to detect and calculate the steering wheel angle.

Conditions for Running the DTC

Ignition ON.

Conditions for Setting the DTC
    • The PSCM detects open, short to ground or short between any of the motor rotational sensor circuits.
    • The PSCM detects the steering wheel angle is outside the valid range of -720 to +720 degrees.

Actions Taken When DTC Sets
    • DTC C0460 00 is stored in memory.
    • The driver information center (DIC) displays the SERVICE POWER STEERING message.
    • No steering assist.

Conditions for Clearing the DTC
    • A current DTC will clear on the next malfunction free ignition cycle.
    • A history DTC will clear after 100 consecutive malfunction-free ignition cycles.

Reference Information

Schematic Reference

Power Steering Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Power Steering System 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, then center the steering wheel, observe the scan tool Steering Wheel Position parameter, the reading should be 0 +/- 10 degrees.
    2. ⇒If not within the specified range, perform the steering position torque sensor calibration, and verify DTC C0460 is not set as current.

Circuit/System Testing

Danger: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.

The High Voltage Disabling procedure will perform the following tasks:

   • Identify how to disable high voltage.
   • Identify how to test for the presence of high voltage.
   • Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.
Failure to follow the procedures exactly as written may result in serious injury or death.

Important: After verifying a circuit fault exists in the Power Steering Wiring Harness Extension Harness for Two Mode Hybrid. The wiring harness is to be replaced and not repaired.

  1. Perform the High Voltage Disabling procedure.
  2. Ignition OFF, connect the 12-volt battery.
  3. Ignition OFF, disconnect the X3 harness connector at the PSCM.
  4. Test for 3K-10K Ω between the low reference circuit terminal 1 and the signal circuit terminal 7.
    5. ⇒If not within the specified range, test the signal circuit and the low reference circuit for an open/high resistance or a short together. If the circuits test normal, replace the power steering assist motor.
  5. Test for 6K-20K Ω between the low reference circuit terminal 1 and the signal circuit terminal 8.
    6. ⇒If not within the specified range, test the signal circuit and the low reference circuit for an open/high resistance or a short together. If the circuits test normal, replace the power steering assist motor.
  6. Test for greater than infinite resistance between the ground circuit terminal 3 and the EPS motor housing.
    7. ⇒If less than the specified range, test the circuits for a short to ground. If the circuits test normal, replace the power steering assist motor.
  7. If all circuits test normal, test or replace the PSCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Power Steering Wiring Harness Extension Harness Replacement
    •  Power Steering Assist Motor Replacement
    •  Control Module References for PSCM replacement, setup, and programming