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 MANUALSGMC2016SAVANA 3500 BASE, VAN CARGO EXTENDED, 6.6L ENG VIN LREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMDATA COMMUNICATION SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC U1826: LOST COMMUNICATION WITH MULTI-AXIS ACCELERATION SENSOR MODULE ON BUS "B"CIRCUIT/SYSTEM TESTING
2016 GMC Savana 3500 Base, Van Cargo Extended, 6.6L Eng VIN L
Circuit/System Testing
2016 GMC Savana 3500 Base, Van Cargo Extended, 6.6L Eng VIN LSECTION Circuit/System Testing
- 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.