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.
Circuit/System Verification
2019 Chevrolet Trax Premier, AWDSECTION Circuit/System Verification
WARNING: This page is about a different car, the 2018 Chevrolet Trax and 2018 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
- Refer to SIR Service Precautions .
- Inspect all terminals for damage or corrosion when disconnecting connectors. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
- Front impact sensor
- Side impact sensor
- Inflatable restraint sensing and diagnostic module
- Front impact sensor wiring harness connector
- Side impact sensor wiring harness connector
- Inflatable restraint sensing and diagnostic module wiring harness connector
- The connector and connector position assurance (CPA) may seat independent of each other. Both the connector and CPA should seat with an audible and/or tactile click. The CPA isolates the shorting-bars within the connector allowing the deployment circuit to operate properly. Replace any CPA that is damaged or missing.
- If the condition is intermittent or cannot be duplicated, disconnect the connectors and add dielectric grease/lubricant (Nyogel 760G or equivalent, meeting GM specification 9986087). This procedure will correct the high resistance condition due to terminal fretting corrosion.
- Verify that DTC B0091 symptom byte 39 or 71 is not set as current.
- If DTC B0091 symptom byte 39 or 71 is set as current
Replace the B59 Front Impact Sensor.
- Go to next step: If DTC B0091 symptom byte 39 or 71 is not set as current
- If DTC B0091 symptom byte 39 or 71 is set as current
- Verify that DTC B0091 symptom byte 3 A is not set as current.
- If DTC B0091 symptom byte 3 A is set as current
Replace the incorrect B59 Front Impact Sensor
- Go to next step: If DTC B0091 symptom byte 3 A is not set as current
- If DTC B0091 symptom byte 3 A is set as current
- Verify that DTC B0091 symptom byte 01, 02, 04, or 05 is not set as current.
- If DTC B0091 symptom byte 01, 02, 04, or 05 is set as current
Refer to Circuit/System Testing.
- Go to next step: If DTC B0091 symptom byte 01, 02, 04, 05 is not set as current
- If DTC B0091 symptom byte 01, 02, 04, or 05 is set as current
- All OK.
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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.