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 1428 (ANTI-LOCK BRAKE SYSTEM, TRACTION CONTROL SYSTEM & STABILITY CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC C0186CIRCUIT/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 is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the Yaw Rate/Lateral Accelerometer sensor.
- Test for less than 1 ohm of resistance between the ground circuit terminal 6 and ground.
- If greater than the specified range, test for an open/high resistance in the ground circuit. If the circuit tests normal, replace the yaw rate/lateral accelerometer sensor.
- Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 1 and ground.
- If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the yaw rate/lateral accelerometer sensor.
- Ignition OFF, disconnect the harness connector at the EBCM.
- Ignition ON, test for 0 volts between the communication circuit terminal 21 and ground.
- If greater than the specified value, test the communication circuit for a short to voltage.
- Test for 0 volts between the communication circuit terminal 33 and ground.
- If greater than the specified value, test the communication circuit for a short to voltage.
- Ignition OFF, test for infinite resistance between the communication circuit terminal 21 and ground.
- If not the specified value, test the communication circuit for a short to ground.
- Test for infinite resistance between the communication circuit terminal 33 and ground.
- If not the specified value, test the communication circuit for a short to ground.
- Test for less than 1 ohm between the communication circuit terminals 21 and terminal 3.
- If greater than the specified range, test the communication circuit for an open/high resistance.
- Test for less than 1 ohm between the communication circuit terminals 33 and terminal 2.
- If greater than the specified range, test the communication circuit for an open/high resistance.
- Test for infinite resistance between the communication circuit 21 and the communication circuit 33.
- If not the specified value, test the communication circuits for a short together.
- If all circuits test normal, replace the Yaw Rate/Lateral sensor.
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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.