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 MANUALSCHEVROLET2019TAHOE LS, 4WD, GAS/ETHANOLREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 141 (ENGINE CONTROLS AND FUEL - 6.0L (L96) - DIAGNOSTIC INFORMATION AND PROCEDURES (DTC P0010 TO DTC P0341))DIAGNOSTIC INFORMATION AND PROCEDURESDTC P025A (CHASSIS CONTROL MODULE)CIRCUIT/SYSTEM TESTING
2019 Chevrolet Tahoe LS, 4WD, Gas/Ethanol
Circuit/System Testing
2019 Chevrolet Tahoe LS, 4WD, Gas/EthanolSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2019 Chevrolet Suburban 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition/Vehicle & All vehicle systems - Off
- Disconnect the electrical connector: K38 Chassis Control Module
- Connect a test lamp between the test points: Control circuit terminal 20 & Ground
- Perform the scan tool control function: Fuel Pump Enable Command@Engine Control Module - On and Off
Verify the test lamp turns On and Off.
- If the test lamp is always Off
- Ignition/Vehicle - Off & Remove - Test lamp
- Disconnect the electrical connector: K20 Engine Control Module
- Ignition - On / Vehicle - In Service Mode
- Test for less than 1 V between the test points: Control circuit terminal 20@K38 Chassis Control Module & 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 less than 2 ohms between the test points: Control circuit terminal 20@K38 Chassis Control Module & The other end of the circuit
- If 2 ohms or greater - Repair the open/high resistance in the circuit.
- If less than 2 ohms - Replace the component: K20 Engine Control Module
- If the test lamp is always On
- Ignition/Vehicle - Off & Remove - Test lamp
- Disconnect the electrical connector: K20 Engine Control Module
- Test for infinite resistance between the test points: Control circuit terminal 20@K38 Chassis Control Module & Ground
- If less than infinite resistance - Repair the short to ground on the circuit.
- If infinite resistance - Replace the component: K20 Engine Control Module
- Go to next step: If the test lamp turns On and Off
- Test or replace the component: K38 Chassis Control Module
NOTE:
It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.
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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.