Chevrolet Silverado / GMC Sierra. Manual - part 732
Whine/Growl Noise That Changes with Vehicle Speed
Noise in First or Reverse Gear
Noise in First, Second, Third, Fourth, Fifth, or Reverse Gear
Noise in First, Second, Sixth, or Reverse Gear
Noise in Second or Sixth Gear
Noise During 3-4 or 4-3 Shifts
Noise in Fourth, Fifth, or Sixth Gear
Vibration
Vibration in Second, Third, Fourth, Fifth, or Sixth Gear
Flexplate/Torque Converter Vibration Test
Noise and Vibration Analysis
Range Performance Diagnosis
No Park or Drive
No Drive in All Ranges
No Reverse Gear
No Drive or Reverse Gear
Shift Quality Feel Diagnosis
Harsh Garage Shift
Harsh, Soft, Delayed or Slipping First or Reverse Gear
Harsh, Soft, Delayed or Slipping 1-2-3-4 Shift
Harsh, Soft, Delayed or Slipping 4-5-6 Shift
Harsh, Soft, Delayed or Slipping Third, Fifth, or Reverse Gear
Harsh, Soft, Delayed or Slipping Second or Sixth Gear
Shift Pattern
No First Gear
No First and Reverse Gears
No First, Second, Third, and Fourth Gear
No First, Second, Third, Fourth, Fifth, or Reverse Gear
No Second and Sixth Gear
No First, Second, Sixth, or Reverse Gear
No Fourth, Fifth, and Sixth Gear
No Third, Fifth, and Reverse Gear
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
Stuck in Second or Sixth Gear
Stuck in First or Reverse Gear
Torque Converter Diagnosis
Torque Converter Diagnosis
No Torque Converter Clutch Apply
No Torque Converter Clutch Release
Symptom Not Found or No Symptom Detected
Transmission Fluid Check
Road Test
Line Pressure Check
CONTROL SOLENOID VALVE AND TRANSMISSION CONTROL MODULE
ASSEMBLY INSPECTION
Fig. 1: Identifying Control Solenoid Valve & Transmission Control Module Assembly
Courtesy of GENERAL MOTORS CORP.
1. Inspect the control solenoid (w/body and TCM) valve assembly connectors and pins (2, 3,
4) for the following conditions:
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
Damage
Bent pins
Debris
Broken retaining tab
Contamination
2. Ensure no metallic debris is inside the connectors near the terminal pins.
3. Inspect the control solenoid (w/body and TCM) valve assembly solenoid leads (1) for
contamination or metallic debris.
4. Inspect the 4 control solenoid (w/body and TCM) valve assembly filter plate retaining tabs
(5) for cracks and ensure proper tension when filter plate is attached.
CONTROL SOLENOID VALVE AND TRANSMISSION CONTROL MODULE
ASSEMBLY INPUT SHAFT SPEED/OUTPUT SHAFT SPEED INPUT TEST
Tools Required
J 35616 GM-Approved Terminal Test Kit
J 38522 Variable Signal Generator
TEST
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
Fig. 2: Identifying J 35616 And J 38522
Courtesy of GENERAL MOTORS CORP.
The purpose of this test is to provide a simulated input/output speed sensor (ISS/OSS) signal to
the control solenoid (w/body and TCM) valve assembly ISS/OSS input circuits.
1. Disconnect the ISS/OSS wiring harness connector from the control solenoid (w/body and
TCM) valve assembly.
2. Using the J 35616 , connect the J 38522 to the affected ISS or OSS signal circuit on the
control solenoid (w/body and TCM) valve assembly.
1. Set the J 38522 Signal to 8 volts, the Frequency to 120 and the Percent Duty Cycle to
50.
2. Ignition On, observe either the scan tool parameter ISS Signal or OSS Signal.
3. The signal parameter should display between 100-400 RPM.
If the signal display is not in this range, the control solenoid (w/body and TCM) valve
assembly is not reading the input signal correctly and is faulty.
CONTROL SOLENOID VALVE AND TRANSMISSION CONTROL MODULE
ASSEMBLY CLEANING
The control solenoid (w/body and TCM) valve assembly cleaning procedure is a specific
software based routine, which resides in the TCM. This procedure is activated by the scan tool
and is used to cycle the solenoids and valves in the control solenoid valve assembly in an attempt
to dislodge debris and free up the valves after a performance diagnostic trouble code (DTC) has
set. When the cleaning procedure is completed, the DTC enable criteria should be run again, to
see if the DTC concern has been corrected.
1. Operate the transmission to achieve 70°-90°C (158°-194°F).
2. With a scan tool, select the Service Cleaning Procedure. Initiate the cleaning procedure.
3. When the cleaning procedure is completed, shut OFF the ignition for 30 seconds.
4. Restart the engine and operate the vehicle based on the criteria specified in Conditions for
Running the DTC.
5. Observe if the applicable DTC or DTCs have run and passed to verify if the cleaning
procedure was effective.
CONTROL SOLENOID VALVE AND TRANSMISSION CONTROL MODULE
ASSEMBLY SOLENOID PERFORMANCE TEST
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado