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Chevrolet Silverado / GMC Sierra. Manual - part 2515
CPP Sensor Percentage
Circuit/System Description
The clutch pedal position (CPP) is a three wire sensor, connected to a 5-volt reference circuit, a
low reference circuit, and a signal circuit. The engine control module (ECM) supplies 5-volts to
the CPP sensor, and also provides a sensor ground path on the low reference circuit. The CPP
sensor sends a voltage signal to the ECM on the signal circuit. The voltage on the signal circuit
will vary from a voltage less than or equal to 5-volts when the clutch pedal is released to a
voltage less than or equal to 1.5-volts when the clutch pedal is applied.
Conditions for Running the DTC
DTCs P0641 or P0651 are not set.
The system voltage is more than 9 volts.
The ignition is in the RUN position.
Conditions for Setting the DTC
P0807
The CPP sensor voltage is less than 0.1 volt for more than 1 second.
P0808
Circuit
Ground
Open
Voltage
Operating Conditions: Ignition ON.
CPP Sensor Voltage Parameter Normal Range: 0-volts with clutch pedal applied to 5-volts
when clutch pedal is released.
CPP Sensor 5-Volt Reference
0 volts
0 volts
5 volts
CPP Sensor Signal
0 volts
0 volts
5 volts
CPP Sensor Low Reference
-
5 volts
-
Circuit
Short to
Ground
Open
Short to
Voltage
Operating Conditions: Ignition ON.
CPP Sensor Percentage Parameter Normal Range: 0% with clutch pedal released to 100%
when clutch pedal is applied.
CPP Sensor 5-Volt Reference
100%
100%
0-100%
CPP Sensor Signal
100%
100%
100%
CPP Sensor Low Reference
-
0%
-
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Manual Transmission - Tremec 5-Speed (M96) - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
The CPP sensor voltage is more than 5.2 volts for more than 1 second.
Action Taken When the DTC Sets
P0807 and P0808 are Type A DTCs.
Conditions for Clearing the MIL/DTC
P0807 and P0808 are Type A DTCs.
Reference Information
Schematic Reference
PSD SIE TITLE Error: SIE linked to empty Cell ID 168122
Connector End View Reference
Component Connector End Views
Description and Operation
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. If DTC P0641 or P0651 is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Manual Transmission - Tremec 5-Speed (M96) - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
2. Ignition ON, observe the scan tool CPP sensor percent parameter. The percentage should
vary from 0 percent when the clutch pedal is released, to 100 percent when the clutch pedal
is in the apply position.
3. Perform the CPP learn procedure. Refer to Clutch Pedal Position Sensor Learn.
4. 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 OFF, test for less than 1 ohm between the low reference circuit terminal A and the
negative post of the battery.
If greater than the specified value, test the low reference circuit for an open/high
resistance. If the circuit tests normal, replace the ECM.
3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal C and
ground.
If less than the specified range, test the 5-volt reference circuit for a short to ground or
an open/high resistance. If the circuit tests normal, replace the ECM.
If greater than the specified range, test the 5-volt reference circuit for a short to
voltage. If the circuit tests normal, replace the ECM.
4. Ignition ON, verify that the scan tool CPP sensor parameter is less than 0.1 volts.
If greater than the specified value, test the signal circuit for a short to voltage. If the
circuit tests normal, replace the ECM.
5. Install a 3-amp fused jumper wire between the signal circuit terminal B and the 5-volt
reference circuit terminal C. Verify that the scan tool CPP sensor parameter is between 4.8-
5.2 volts.
If less than the specified range, test the signal circuit for a short to ground or an
open/high resistance. If the circuit tests normal, replace the ECM.
6. If all circuits test normal, test or replace the CPP sensor.
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
low to high and high to low without any spikes or dropouts.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Manual Transmission - Tremec 5-Speed (M96) - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
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 P080A
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 P080A
Clutch Pedal Position (CPP) Not Learned
Circuit/System Description
The clutch pedal position (CPP) is a three wire sensor, connected to a 5-volt reference circuit, a
low reference circuit, and a signal circuit. The engine control module (ECM) supplies 5-volts to
the CPP sensor, and also provides a sensor ground path on the low reference circuit. The CPP
sensor sends a voltage signal to the ECM on the signal circuit. The voltage on the signal circuit
will vary from a voltage less than or equal to 5-volts when the clutch pedal is released to a
voltage less than or equal to 1.5-volts when the clutch pedal is applied.
Conditions for Running the DTC
Clutch pedal fully applied.
Conditions for Setting the DTC
Clutch pedal position not learned.
Action Taken When the DTC Sets
P080A is a Type B DTC.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Manual Transmission - Tremec 5-Speed (M96) - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
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