Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2019EXPRESS 2500 BASE, VAN CARGO EXTENDED, 6.0L ENG VIN GREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 38 (CRUISE CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESCRUISE CONTROL MALFUNCTIONCIRCUIT/SYSTEM TESTING
2019 Chevrolet Express 2500 Base, Van Cargo Extended, 6.0L Eng VIN G
Circuit/System Testing
2019 Chevrolet Express 2500 Base, Van Cargo Extended, 6.0L Eng VIN GSECTION Circuit/System Testing
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.
Cruise Control Switch Signal
- Ignition/Vehicle & All vehicle systems - Off
- Disconnect the component: K9 Body Control Module
- Disconnect the component: Cruise Control Switch Assembly
- Ignition - On/Vehicle - In Service Mode
- Test for less than 1 V between the test points:
- 12 V Reference circuit & Ground
- Cruise Control Switch Signal & Ground
- If 1 V or greater - Repair the short to voltage on the circuit.
- Go to next step: If less than 1 V
- Ignition/Vehicle - Off
- Test for infinite resistance between the test points:
- 12 V Reference circuit & Ground
- Cruise Control Switch Signal & Ground
- If less than infinite resistance - Repair the short to ground on the circuit.
- Go to next step: If infinite resistance
- Test for less than 2 ohms between the test points:
- 12 V Reference circuit @ Component harness & The other end of the circuit @ Control module harness
- Cruise Control Switch Signal @ Component harness & The other end of the circuit @ Control module harness
- If 2 ohms or greater - Repair the open/high resistance in the circuit.
- Go to next step: If less than 2 ohms
- Test or replace the component: Cruise Control Switch Assembly
- Operate the vehicle within the Conditions for Running the DTC. Verify the DTC does not set.
- If the DTC sets
Replace the component: K9 Body Control Module
- Go to next step: If the DTC is not set
- If the DTC sets
- All OK.
Adaptive Cruise Control Gap Up/Down Switch Signal
- Ignition/Vehicle & All vehicle systems - Off
- Disconnect the component: K9 Body Control Module
- Disconnect the component: Cruise Control Switch Assembly
- Ignition - On/Vehicle - In Service Mode
- Test for less than 1 V between the test points:
- 12 V Reference circuit & Ground
- Adaptive Cruise Control Gap Up/Down Switch Signal & Ground
- If 1 V or greater - Repair the short to voltage on the circuit.
- Go to next step: If less than 1 V
- Ignition/Vehicle - Off
- Test for infinite resistance between the test points:
- 12 V Reference circuit & Ground
- Adaptive Cruise Control Gap Up/Down Switch Signal & Ground
- If less than infinite resistance - Repair the short to ground on the circuit.
- Go to next step: If infinite resistance
- Test for less than 2 ohms between the test points:
- 12 V Reference circuit @ Component harness & The other end of the circuit @ Control module harness
- Adaptive Cruise Control Gap Up/Down Switch Signal @ Component harness & The other end of the circuit @ Control module harness
- If 2 ohms or greater - Repair the open/high resistance in the circuit.
- Go to next step: If less than 2 ohms
- Test or replace the component: Cruise Control Switch Assembly
- Operate the vehicle within the Conditions for Running the DTC. Verify the DTC does not set.
- If the DTC sets
Replace the component: K9 Body Control Module
- Go to next step: If the DTC is not set
- If the DTC sets
- All OK.
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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.