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HOMESERVICE MANUALSCHEVROLET2019EXPRESS 2500 BASE, VAN CARGO EXTENDED, 6.0L ENG VIN GREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 58 (VEHICLE DIAGNOSTIC INFORMATION - SCAN TOOL DATA (2 OF 2))SPECIFICATIONSK71 TRANSMISSION CONTROL MODULE: SCAN TOOL INFORMATION (8L90)
2019 Chevrolet Express 2500 Base, Van Cargo Extended, 6.0L Eng VIN G
K71 Transmission Control Module: Scan Tool Information (8L90)
2019 Chevrolet Express 2500 Base, Van Cargo Extended, 6.0L Eng VIN GSECTION K71 Transmission Control Module: Scan Tool Information (8L90)
WARNING: This page is about a different car, the 2018 GMC Savana 3500, 2018 GMC Savana 2500, 2018 Chevrolet Express 3500, and 2018 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
K71 Transmission Control ModuleScan Tool Parameters
| Parameter | Ignition=On - Cold | Ignition On - Engine Running - Operating temperature | 48 km/h (30 MPH) | 80 km/h (50 MPH) | Display Units |
|---|---|---|---|---|---|
| 9V Reference 1 Circuit Status | OK | OK | OK | OK | Not Run/OK/Malfunction |
| 9V Reference 2 Circuit Status | OK | OK | OK | OK | Not Run/OK/Malfunction |
| Calculated Line Pressure | 550 to 620 kPa (80 to 90 PSI) | 550 to 620 kPa (80 to 90 PSI) | 380 to 480 kPa (55 to 70 PSI) | 380 to 480 kPa (55 to 70 PSI) | kPa (PSI) |
| Calculated Throttle Position | 0% | 0% | 8% | 10% | % |
| Control Module Voltage | Greater than 11 V | 12 to 15 V | 12 to 15 V | 12 to 15 V | Voltage |
| Driver Shift Control Mode | Inactive | Inactive | Inactive | Inactive | Active/Inactive |
| Driver Shift Request | Inactive | Inactive | Inactive | Inactive | Inactive/Upshift/Downshift |
| Engine Coolant Temperature... | 21°C (70°F) | 80 to 95°C (175 to 205°F) | 80 to 95°C (175 to 205°F) | 80 to 95°C (175 to 205°F) | °C (°F) |
| Engine Speed | 0 RPM | 575 RPM | 1080 RPM | 1180 RPM | RPM |
| Engine Torque | 0 Nm (0 lb ft) | 4 Nm (2.95 lb ft) | 53 Nm (39 lb ft) | 75 Nm (55 lb ft) | Nm (lb ft) |
| Gear Command | 1 | 1 | 6 | 8 | Park/Reverse/Neutral/Drive/1-8 |
| Gear Ratio | 8.00:1 | 8.00:1 | 1.00:1 | 0.65:1 | Gear Ratio |
| High Side Driver 1 Circuit High Voltage Test Status | OK | OK | Not Run | Not Run | Not Run/OK/Malfunction |
| High Side Driver 2 Circuit High Voltage Test Status | OK | OK | Not Run | Not Run | Not Run/OK/Malfunction |
| High Side Driver 1 Circuit Low Voltage Test Status | Not Run | OK | Not Run | Not Run | Not Run/OK/Malfunction |
| High Side Driver 2 Circuit Low Voltage Test Status | Not Run | OK | Not Run | Not Run | Not Run/OK/Malfunction |
| High Side Driver 1 Circuit Open Test Status | Not Run | Not Run | Not Run | Not Run | Not Run/OK/Malfunction |
| High Side Driver 2 Circuit Open Test Status | Not Run | Not Run | Not Run | Not Run | Not Run/OK/Malfunction |
| Ignition 1 Signal | ON | ON | ON | ON | ON/OFF |
| Ignition Accessory Signal | ON | ON | ON | ON | ON/OFF |
| Ignition Voltage | Greater than 11 V | 12 to 15 V | 12 to 15 V | 12 to 15 V | Voltage |
| Internal Mode Switch A/B/C/P/S | Low High Low High High | Low High Low High High | Low High High Low Low | Low High High Low Low | High/Low |
| Internal Mode Switch A | 1.90 V | 1.90 V | 1.90 V | 1.90 V | Voltage |
| Internal Mode Switch A Status | Valid | Valid | Valid | Valid | Valid/Invalid |
| Internal Mode Switch B | 0.78 V | 0.78 V | 0.78 V | 0.78 V | Voltage |
| Internal Mode Switch B Status | Valid | Valid | Valid | Valid | Valid/Invalid |
| Internal Mode Switch C | 1.84 V | 1.84 V | 0.78 V | 0.78 V | Voltage |
| Internal Mode Switch C Status | Valid | Valid | Valid | Valid | Valid/Invalid |
| Internal Mode Switch P | 0.80 V | 0.80 V | 1.90 V | 1.90 V | Voltage |
| Internal Mode Switch P Status | Valid | Valid | Valid | Valid | Valid/Invalid |
| Internal Mode Switch S | 0.80 V | 0.80 V | 1.90 V | 1.90 V | Voltage |
| Internal Mode Switch S Status | Valid | Valid | Valid | Valid | Valid/Invalid |
| Internal Mode Switch. | Park | Park | Drive | Drive | Park/Neutral/Drive |
| ISS/OSS Supply Voltage | OK | OK | OK | OK | OK/Malfunction |
| Power Mode | Run | Run | Run | Run | OFF/Accessory/Run |
| TCC Slip Speed | 0 RPM | 20 RPM | 60 RPM | 60 RPM | RPM |
| TCC Pressure Control Solenoid Valve Pressure Command | 0 kPa (0 PSI) | 0 kPa (0 PSI) | 175 kPa (25 PSI) | 175 kPa (25 PSI) | kPa (PSI) |
| Transmission Control Solenoid Valve 1 Pressure Command | 0 kPa (0 PSI) | 160 kPa (25 PSI) | 100 kPa (15 PSI) | 80 kPa (10 PSI) | kPa (PSI) |
| Transmission Control Solenoid Valve 2 Pressure Command | 0 kPa (0 PSI) | 0 kPa (0 PSI) | 1640 kPa (240 PSI) | 0 kPa (0 PSI) | kPa (PSI) |
| Transmission Control Solenoid Valve 3 Pressure Command | 0 kPa (0 PSI) | 1530 kPa (220 PSI) | 7 kPa (1 PSI) | 0 kPa (0 PSI) | kPa (PSI) |
| Transmission Control Solenoid Valve 4 Pressure Command | 0 kPa (0 PSI) | 0 kPa (0 PSI) | 1640 kPa (240 PSI) | 1640 kPa (240 PSI) | kPa (PSI) |
| Transmission Control Solenoid Valve 5 Pressure Command | 0 kPa (0 PSI) | 760 kPa (110 PSI) | 0 kPa (0 PSI) | 760 kPa (110 PSI) | kPa (PSI) |
| Transmission Control Solenoid Valve 8 | Off | Off | On | On | On/Off |
| Transmission Control Solenoid Valve 9 | Off | Off | On | On | On/Off |
| Transmission Control Solenoid Valve 1-9 Control Circuit High Voltage Test Status | Not Run | OK | OK | OK | Not Run/OK/Malfunction |
| Transmission Control Solenoid Valve 1-9 Control Circuit Low Voltage Test Status | Not Run | OK | OK | OK | Not Run/OK/Malfunction |
| Transmission Control Solenoid Valve 1-9 Control Circuit Open Test Status | Not Run | OK | OK | OK | Not Run/OK/Malfunction |
| Transmission Fluid Temperature | 21°C (70°F) | 46 to 82°C (115 to 180°F) | 46 to 82°C (115 to 180°F) | 46 to 82°C (115 to 180°F) | °C (°F) |
| Transmission Hot Mode | No | No | Yes | Yes | No/Yes |
| Transmission Intermediate Speed Sensor | 0 RPM | 0 RPM | 1025 RPM | 1735 RPM | RPM |
| Transmission ISS | 0 RPM | 565 RPM | 1025 RPM | 1125 RPM | RPM |
| Transmission OSS | 0 RPM | 0 RPM | 1025 RPM | 1735 RPM | RPM |
| Up and Down Shift Switch 2 | Inactive | Inactive | Inactive | Inactive | Inactive/Upshift/Downshift |
| Vehicle Speed Sensor | 0 km/h (0 MPH) | 0 km/h (0 MPH) | 48 km/h (30 MPH) | 80 km/h (50 MPH) | km/h (MPH) |
K71 Transmission Control ModuleScan Tool Control Functions
| Control Function | Description |
|---|---|
| High Side Driver 1 Command | Allows command of the high side driver 1 (ON or OFF). |
| High Side Driver 2 Command | Allows command of the high side driver 2 (ON or OFF). |
| Line Pressure Command | Allows command of the Line Pressure solenoid. (Increase / Decrease). |
| Shift Transmission Gear Command | Allows upshift/downshift of the transmission between all gears - if the operating conditions allow a shift to occur (does not cause engine overspeed / underspeed). |
| Transmission Control Solenoid Valve 1-7 Current Command | Allows command of the transmission solenoids 1-7 (electrical current range 0-1.2 amps). |
| Transmission Control Solenoid Valve 1-7 | Allows command of the solenoid valve 1-7 (OFF or ON). |
| Transmission Control Solenoid Valve 8-9 | Allows command of the solenoid valve 8-9 (OFF or ON). |
K71 Transmission Control ModuleScan Tool Parameters
| Parameter | Ignition=On - Cold | Ignition On - Engine Running - Operating temperature | 48 km/h (30 MPH) | 80 km/h (50 MPH) | Display Units |
|---|---|---|---|---|---|
| 9V Reference 1 Circuit Status | OK | OK | OK | OK | Not Run/OK/Malfunction |
| 9V Reference 2 Circuit Status | OK | OK | OK | OK | Not Run/OK/Malfunction |
| Calculated Line Pressure | 550 to 620 kPa (80 to 90 PSI) | 550 to 620 kPa (80 to 90 PSI) | 380 to 480 kPa (55 to 70 PSI) | 380 to 480 kPa (55 to 70 PSI) | kPa (PSI) |
| Calculated Throttle Position | 0% | 0% | 8% | 10% | % |
| Control Module Voltage | Greater than 11 V | 12 to 15 V | 12 to 15 V | 12 to 15 V | Voltage |
| Driver Shift Control Mode | Inactive | Inactive | Inactive | Inactive | Active/Inactive |
| Driver Shift Request | Inactive | Inactive | Inactive | Inactive | Inactive/Upshift/Downshift |
| Engine Coolant Temperature... | 21°C (70°F) | 80 to 95°C (175 to 205°F) | 80 to 95°C (175 to 205°F) | 80 to 95°C (175 to 205°F) | °C (°F) |
| Engine Speed | 0 RPM | 575 RPM | 1080 RPM | 1180 RPM | RPM |
| Engine Torque | 0 Nm (0 lb ft) | 4 Nm (2.95 lb ft) | 53 Nm (39 lb ft) | 75 Nm (55 lb ft) | Nm (lb ft) |
| Gear Command | 1 | 1 | 6 | 8 | Park/Reverse/Neutral/Drive/1-8 |
| Gear Ratio | 8.00:1 | 8.00:1 | 1.00:1 | 0.65:1 | Gear Ratio |
| High Side Driver 1 Circuit High Voltage Test Status | OK | OK | Not Run | Not Run | Not Run/OK/Malfunction |
| High Side Driver 2 Circuit High Voltage Test Status | OK | OK | Not Run | Not Run | Not Run/OK/Malfunction |
| High Side Driver 1 Circuit Low Voltage Test Status | Not Run | OK | Not Run | Not Run | Not Run/OK/Malfunction |
| High Side Driver 2 Circuit Low Voltage Test Status | Not Run | OK | Not Run | Not Run | Not Run/OK/Malfunction |
| High Side Driver 1 Circuit Open Test Status | Not Run | Not Run | Not Run | Not Run | Not Run/OK/Malfunction |
| High Side Driver 2 Circuit Open Test Status | Not Run | Not Run | Not Run | Not Run | Not Run/OK/Malfunction |
| Ignition 1 Signal | ON | ON | ON | ON | ON/OFF |
| Ignition Accessory Signal | ON | ON | ON | ON | ON/OFF |
| Ignition Voltage | Greater than 11 V | 12 to 15 V | 12 to 15 V | 12 to 15 V | Voltage |
| Internal Mode Switch A/B/C/P/S | Low High Low High High | Low High Low High High | Low High High Low Low | Low High High Low Low | High/Low |
| Internal Mode Switch A | 1.90 V | 1.90 V | 1.90 V | 1.90 V | Voltage |
| Internal Mode Switch A Status | Valid | Valid | Valid | Valid | Valid/Invalid |
| Internal Mode Switch B | 0.78 V | 0.78 V | 0.78 V | 0.78 V | Voltage |
| Internal Mode Switch B Status | Valid | Valid | Valid | Valid | Valid/Invalid |
| Internal Mode Switch C | 1.84 V | 1.84 V | 0.78 V | 0.78 V | Voltage |
| Internal Mode Switch C Status | Valid | Valid | Valid | Valid | Valid/Invalid |
| Internal Mode Switch P | 0.80 V | 0.80 V | 1.90 V | 1.90 V | Voltage |
| Internal Mode Switch P Status | Valid | Valid | Valid | Valid | Valid/Invalid |
| Internal Mode Switch S | 0.80 V | 0.80 V | 1.90 V | 1.90 V | Voltage |
| Internal Mode Switch S Status | Valid | Valid | Valid | Valid | Valid/Invalid |
| Internal Mode Switch. | Park | Park | Drive | Drive | Park/Neutral/Drive |
| ISS/OSS Supply Voltage | OK | OK | OK | OK | OK/Malfunction |
| Power Mode | Run | Run | Run | Run | OFF/Accessory/Run |
| TCC Slip Speed | 0 RPM | 20 RPM | 60 RPM | 60 RPM | RPM |
| TCC Pressure Control Solenoid Valve Pressure Command | 0 kPa (0 PSI) | 0 kPa (0 PSI) | 175 kPa (25 PSI) | 175 kPa (25 PSI) | kPa (PSI) |
| Transmission Control Solenoid Valve 1 Pressure Command | 0 kPa (0 PSI) | 160 kPa (25 PSI) | 100 kPa (15 PSI) | 80 kPa (10 PSI) | kPa (PSI) |
| Transmission Control Solenoid Valve 2 Pressure Command | 0 kPa (0 PSI) | 0 kPa (0 PSI) | 1640 kPa (240 PSI) | 0 kPa (0 PSI) | kPa (PSI) |
| Transmission Control Solenoid Valve 3 Pressure Command | 0 kPa (0 PSI) | 1530 kPa (220 PSI) | 7 kPa (1 PSI) | 0 kPa (0 PSI) | kPa (PSI) |
| Transmission Control Solenoid Valve 4 Pressure Command | 0 kPa (0 PSI) | 0 kPa (0 PSI) | 1640 kPa (240 PSI) | 1640 kPa (240 PSI) | kPa (PSI) |
| Transmission Control Solenoid Valve 5 Pressure Command | 0 kPa (0 PSI) | 760 kPa (110 PSI) | 0 kPa (0 PSI) | 760 kPa (110 PSI) | kPa (PSI) |
| Transmission Control Solenoid Valve 8 | Off | Off | On | On | On/Off |
| Transmission Control Solenoid Valve 9 | Off | Off | On | On | On/Off |
| Transmission Control Solenoid Valve 1-9 Control Circuit High Voltage Test Status | Not Run | OK | OK | OK | Not Run/OK/Malfunction |
| Transmission Control Solenoid Valve 1-9 Control Circuit Low Voltage Test Status | Not Run | OK | OK | OK | Not Run/OK/Malfunction |
| Transmission Control Solenoid Valve 1-9 Control Circuit Open Test Status | Not Run | OK | OK | OK | Not Run/OK/Malfunction |
| Transmission Fluid Temperature | 21°C (70°F) | 46 to 82°C (115 to 180°F) | 46 to 82°C (115 to 180°F) | 46 to 82°C (115 to 180°F) | °C (°F) |
| Transmission Hot Mode | No | No | Yes | Yes | No/Yes |
| Transmission Intermediate Speed Sensor | 0 RPM | 0 RPM | 1025 RPM | 1735 RPM | RPM |
| Transmission ISS | 0 RPM | 565 RPM | 1025 RPM | 1125 RPM | RPM |
| Transmission OSS | 0 RPM | 0 RPM | 1025 RPM | 1735 RPM | RPM |
| Up and Down Shift Switch 2 | Inactive | Inactive | Inactive | Inactive | Inactive/Upshift/Downshift |
| Vehicle Speed Sensor | 0 km/h (0 MPH) | 0 km/h (0 MPH) | 48 km/h (30 MPH) | 80 km/h (50 MPH) | km/h (MPH) |
K71 Transmission Control ModuleScan Tool Control Functions
| Control Function | Description |
|---|---|
| High Side Driver 1 Command | Allows command of the high side driver 1 (ON or OFF). |
| High Side Driver 2 Command | Allows command of the high side driver 2 (ON or OFF). |
| Line Pressure Command | Allows command of the Line Pressure solenoid. (Increase / Decrease). |
| Shift Transmission Gear Command | Allows upshift/downshift of the transmission between all gears - if the operating conditions allow a shift to occur (does not cause engine overspeed / underspeed). |
| Transmission Control Solenoid Valve 1-7 Current Command | Allows command of the transmission solenoids 1-7 (electrical current range 0-1.2 amps). |
| Transmission Control Solenoid Valve 1-7 | Allows command of the solenoid valve 1-7 (OFF or ON). |
| Transmission Control Solenoid Valve 8-9 | Allows command of the solenoid valve 8-9 (OFF or ON). |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.