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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 22 (Hybrid/EV System Heating And Cooling) >> Diagnostic Information and Procedures >> DTC P0CEF-P0CF2 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
  1. Vehicle OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Disconnect the harness connector at the B202 Hybrid/EV Electronics Coolant Temperature Sensor.
  2. Test for less than 10 Ω between the low reference circuit terminal 2 and ground.
    • If 10 Ω or greater 
    1. Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K114B Hybrid/EV Powertrain Control Module 2.
    • Go to next step: If less than 10 Ω 
  3. Vehicle in Service Mode.
  4. Verify the scan tool Hybrid/EV Electronics Coolant Temperature is less than -35°C (-38.2°F).
    • If -35°C (-38.2°F) or greater 
    1. Vehicle OFF, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2.
    2. Test for infinite resistance between the signal circuit and the circuits listed below:
      • Low reference circuit
      • Chassis ground
      • If less than infinite resistance, repair the appropriate short to ground on the circuit.
      • If infinite resistance, replace the K114B Hybrid/EV Powertrain Control Module 2.
    • Go to next step: If less than -35°C (-38.2°F) 
  5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2.
  6. Verify the scan tool Hybrid/EV Electronics Coolant Temperature is greater than 99°C (210°F).
    • If less than 99°C (210°F) 
    1. Vehicle OFF, remove the jumper wire, disconnect the X2 harness connector at the K114B Hybrid/EV Powertrain Control Module 2, Vehicle ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    3. Vehicle OFF, test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K114B Hybrid/EV Powertrain Control Module 2.
    • Go to next step: If 99°C (210°F) or greater 
  7. Replace the B202 Hybrid/EV Electronics Coolant Temperature Sensor.
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