Chevrolet Silverado / GMC Sierra. Manual — part 2516
Conditions for Clearing the MIL/DTC
P080A is a Type B DTC.
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
Perform the clutch pedal position sensor learn procedure.
Circuit/System Testing
Perform the clutch pedal position sensor learn procedure.
Repair Procedures
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Manual Transmission - Tremec 5-Speed (M96) - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Clutch Pedal Position Sensor Learn
Control Module References for ECM replacement, setup and programming
CLUTCH PEDAL POSITION SENSOR LEARN
1. Install a scan tool.
2. Monitor the ECM for DTCs with a scan tool. If other DTCs are set, except DTC P080A,
refer to Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set.
3. With a scan tool, select Clutch Pedal Position Learn under Module Setup in Manual
Transmission, and perform the following instructions displayed on the scan tool screen.
4. The scan tool will display under CPP Learn Status: Not Learned, In Process, Complete, Fail
- Low Volt, Fail - High Volt, or Fail Moving. The scan tool will display under CPP Learn
Status Complete if the process was successful.
5. If the scan tool indicates that DTC P080A ran and passed this ignition the CPP sensor learn
procedure is complete. If the scan tool indicates DTC P080A failed or did not run this
ignition, refer to DTC P080A. If any other DTC is set, refer to Diagnostic Trouble Code
(DTC) List - Vehicle for the applicable DTC.
6. Turn OFF the ignition for 30 seconds after the learn procedure has successfully completed
in order to store the CPP sensor variation values in ECM history.
SYMPTOMS - MANUAL TRANSMISSION
Strategy Based Diagnostics
IMPORTANT: The clutch pedal position (CPP) sensor learn procedure is
required when the following service procedures have been
performed regardless of whether DTC P080A is set:
An engine control module (ECM) replacement
A CPP sensor replacement
Any repairs which affect the CPP sensor relationship
IMPORTANT: The CPP sensor learn procedure cannot be performed more
than once per ignition cycle. The clutch pedal needs to be
fully depressed and held steady throughout this procedure in
order to perform a correct learning.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Manual Transmission - Tremec 5-Speed (M96) - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
Review the system operations in order to familiarize yourself with the system functions. Refer to
Manual Transmission Description and Operation.
Visual/Physical Inspection
Inspect the manual transmission for excessive wear or damage.
Inspect the easily accessible or visible system components for obvious damage or conditions
which could cause the symptom.
Inspect the manual transmission for the correct fluid level.
Inspect the manual transmission for fluid leaks.
Inspect the manual transmission for broken or loose transmission mounts.
Intermittent
Test the vehicle under the same conditions that the customer reported in order to verify the system
is operating properly.
Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the
symptom:
Transmission Shifts Hard
Transmission Shifts Hard into Reverse
Transmission Gear Clash When Shifting Gears
Transmission Noisy
Transmission Jumps Out of Gear
Transmission Does Not Shift into One Gear
Transmission Locked in One Gear
Transmission Clunk on Acceleration or Deceleration
Diagnostic Starting Point - Vibration Diagnosis and Correction
Vibration Analysis - Driveline
Driveline Working Angles Measurement
TRANSMISSION SHIFTS HARD
Diagnostic Aids
Hard shifting can be diagnosed easily. You should perform a static and dynamic shift test also.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Manual Transmission - Tremec 5-Speed (M96) - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
Many simple factors could occur such as, excessive clutch pedal free travel, insufficient fluid,
excessive fluid, or the wrong transmission lubricant. A misaligned transmission can also cause
hard shifting, as well as a worn or defective clutch, binding of the shift control. Many internal
components can also play a factor in hard shifting such as, the front bearing retainer loose or
cracked, the synchronizer worn, damaged, or improperly assembled. Failure to fully depress the
clutch pedal while shifting causes hard shifting.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
4: This step inspects for air in the hydraulic lines, which also causes the transmission to shift
hard.
6: This step inspects for a faulty shift control.
10: This step inspects for a faulty or worn clutch pressure plate or clutch driven plate.
Step
Action
Yes
No
DEFINITION: The transmission does not shift smoothly or without difficulty from one gear
to another.
1
Did you review the Symptoms - Manual
Transmission operations and perform the
necessary inspections?
Go to Step 2
Go to Symptoms
- Manual
Transmission
2
Inspect the clutch pedal travel.
Is there sufficient clutch pedal travel?
Go to Step 3
Go to Step 4
3
Remove any clutch pedal restrictions.
Does the transmission shift hard?
Go to Step 4
System OK
4
Test for air in the clutch hydraulic system.
Is there air in the hydraulic system?
Go to Step 5
Go to Step 6
5
Bleed the air from the clutch hydraulic system.
Refer to Hydraulic Clutch Bleeding .
Did you find and repair the condition?
System OK
Go to Step 6
6
Inspect the transmission shift control for
binding.
Is the transmission shift control binding?
Go to Step 7
Go to Step 8
7
Replace the transmission shift tower.
Did you find and repair the condition?
System OK
Go to Step 8
8
Inspect the transmission for the correct type of
transmission fluid.
Is the correct type of transmission fluid being
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Manual Transmission - Tremec 5-Speed (M96) - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
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