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 MANUALSCHEVROLET2019TRAX PREMIER, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 6 (ENGINE COOLING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P00B3 OR P00B4CIRCUIT/SYSTEM TESTING
2019 Chevrolet Trax Premier, AWD
Circuit/System Testing
2019 Chevrolet Trax Premier, AWDSECTION Circuit/System Testing
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.
- Ignition/Vehicle & All vehicle systems - Off
- Disconnect the electrical connector: B203 Radiator Coolant Temperature Sensor
- Test for less than 10 ohms between the test points: Low Reference circuit terminal 2 & Ground
- If 10 ohms or greater
- Disconnect the appropriate electrical connector: K20 Engine Control Module
- Test for less than 2 ohms between the test points: Low Reference circuit terminal 2@Component harness & The other end of the circuit@Control module harness
- If 2 ohms or greater - Repair the open/high resistance in the circuit.
- If less than 2 ohms - Replace the component: K20 Engine Control Module
- Go to next step: If less than 10 ohms
- Ignition - On / Vehicle - In Service Mode
- Verify the scan tool parameter: Radiator Coolant Temperature Sensor = Colder than -39°C (-38°F)
- If -39°C (-38°F) or warmer
- Ignition/Vehicle - Off
- Disconnect the appropriate electrical connector: K20 Engine Control Module
- Test for infinite resistance between the test points: Signal circuit terminal 1@Component harness & Ground
- If less than infinite resistance - Repair the short to ground on the circuit.
- If infinite resistance - Replace the component: K20 Engine Control Module
- Go to next step: If colder than -39°C (-38°F)
- Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 1 & Low Reference circuit terminal 2
- Verify the scan tool parameter: Radiator Coolant Temperature Sensor = Warmer than 149°C (300°F)
- If 149°C (300°F) or colder
- Ignition/Vehicle - Off & Remove - Jumper wire(s)
- Disconnect the appropriate electrical connector: K20 Engine Control Module
- Ignition - On / Vehicle - In Service Mode
- Test for less than 1 V between the test points: Signal circuit terminal 1@Component harness & Ground
- If 1 V or greater - Repair the short to voltage on the circuit.
- Go to next step: If less than 1 V
- Ignition/Vehicle - Off
- Test for less than 2 ohms between the test points: Signal circuit terminal 1@Component harness & The other end of the circuit@Control module harness
- If 2 ohms or greater - Repair the open/high resistance in the circuit.
- If less than 2 ohms - Replace the component: K20 Engine Control Module
- Go to next step: If warmer than 149°C (300°F)
- Test or replace the component: B203 Radiator Coolant Temperature Sensor
NOTE:
It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.
RENDER: 1.0x
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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.