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 MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1843 (DATA COMMUNICATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC U1826CIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Circuit/System Testing
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2009 GMC Savana Special, 2009 GMC Savana Camper Special, 2009 GMC Savana, 2009 Chevrolet RV Cutaway, and 2009 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the yaw/lat sensor.
- Ignition OFF for 60 seconds, test for less than 5 ohm between the low reference circuit terminal 6 and ground.
- If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the EBCM.
- Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.
- If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM.
- Ignition OFF, disconnect the harness connector at the EBCM.
- Ignition ON, test for less than 1 volt between the following terminal listed below and ground at the EBCM harness connector.
- CAN bus high serial data circuit terminal 33
- CAN bus low serial data circuit terminal 21
- If greater than the specified value, test the appropriate serial data circuit for a short to voltage.
- Ignition OFF, test for infinite resistance between the following terminal listed below and ground at the EBCM harness connector.
- CAN bus high serial data circuit terminal 33
- CAN bus low serial data circuit terminal 21
- If not the specified value, test the appropriate serial data circuit for a short to ground.
- Test for less than 2 ohms between the following terminals listed below.
- CAN bus high serial data circuit terminal 33 at the EBCM harness connector and terminal 2 at the yaw/rate sensor.
- CAN bus low serial data circuit terminal 21 at the EBCM harness connector and terminal 3 at the yaw/rate sensor.
- If greater than the specified range, test the appropriate serial data circuit for an open/high resistance.
- Test for infinite resistance between the CAN bus high serial data circuit terminal 33 and the CAN bus low serial data circuit terminal 21 at the EBCM harness connector.
- If not the specified value, test the serial data circuits for a short to each other.
- If all circuits test normal, replace the vehicle yaw sensor with vehicle lateral accelerometer.
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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.