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 MANUALSCHEVROLET2008HHR LT, 2.4 P, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 371 (ANTILOCK BRAKE SYSTEM WITH TRACTION CONTROL SYSTEM & STABILITY CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC C0186CIRCUIT/SYSTEM TESTING
2008 Chevrolet HHR LT, 2.4 P, Automatic
Circuit/System Testing
2008 Chevrolet HHR LT, 2.4 P, AutomaticSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2010 Chevrolet HHR. 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/lat sensor.
- Ignition OFF for 60 seconds, test for less than 5 ohms between the low reference circuit terminal 5 and ground.
- If greater than the specified range, test the low reference circuit for an open/high resistance.
- Ignition ON, test for ignition voltage between the ignition voltage circuit terminal 3 and ground.
- If not within the specified range, test the ignition voltage circuit for a short to ground or open/high resistance.
- 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.
- CAN Bus High serial data circuit terminal 18
- CAN Bus Low serial data circuit terminal 19
- 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.
- CAN Bus High serial data circuit terminal 18
- CAN Bus Low serial data circuit terminal 19
- If not the specified value, test the appropriate serial data circuit for a short to ground.
- Test for less than 2 ohms between the appropriate serial data circuit terminals listed below.
- CAN Bus High serial data circuit terminal 18 at the EBCM harness connector and terminal 2 at the yaw/lat sensor harness connector.
- CAN Bus Low serial data circuit terminal 19 at the EBCM harness connector and terminal 1 at the yaw/lat sensor harness connector.
- 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 18 and the CAN Bus Low serial data circuit terminal 19.
- If not the specified value, repair the serial data circuits for a short together.
- If all circuits test normal, replace the yaw rate/lat sensor. If the DTC resets, replace the EBCM.
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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.