Chevrolet Silverado / GMC Sierra. Manual — part 2514

Manual Transmission Description and Operation

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

Control Module References for scan tool information.

Circuit/System Verification

1. Ignition ON, observe the scan tool CPP sensor percent parameter. The percentage should

vary from 0% when the clutch pedal is released, to 100% when the clutch pedal is in the
apply position.

2. Perform the CPP learn procedure. Refer to Clutch Pedal Position Sensor Learn.

3. Operate the vehicle within the conditions for running the DTC to verify the DTC does not

reset. You may also operate the vehicle within the conditions that you observed from the
Freeze Frame/Failure Records data.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector of the CPP sensor.

2. Ignition ON, observe the scan tool CPP sensor voltage parameter for 0.1-volt.

If the voltage is below the specified value, replace the CPP sensor.

If the voltage is above the specified value, replace the ECM.

Component Testing

1. Ignition OFF, disconnect the harness connector of the CPP sensor.

2. Measure the resistance between the signal terminal B and the low reference terminal A of

the CPP sensor. Sweep the CPP sensor through the entire range. The resistance should vary

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Manual Transmission - Tremec 5-Speed (M96) - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado

low to high and high to low without any spikes or dropouts.

If the resistance is erratic with spikes or dropouts, replace the CPP sensor.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Clutch Pedal Replacement

Control Module References for ECM replacement, setup and programming

DTC P0807 OR P0808

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 Descriptors

DTC P0807

Clutch Pedal Position (CPP) Sensor Circuit Low Voltage

DTC P0808

Clutch Pedal Position (CPP) Sensor Circuit High Voltage

Diagnostic Fault Information

Typical Scan Tool Information

CPP Sensor Voltage

Circuit

Short to

Ground

Open/High

Resistance

Short to

Voltage

Signal

Performance

CPP Sensor Signal

P0807

P0807

P0808

P0806

CPP Sensor 5-Volt Reference

P0651,

P0807

P0807

P0651,

P0808

-

CPP Sensor Low Reference

-

P0808

P0808

-

Short to

Short to

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Manual Transmission - Tremec 5-Speed (M96) - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado