Vehicle: 2018 Chevrolet Malibu, L4-1.5L Turbo, Automatic Transmission/Transaxle
Problem: This vehicle came to the shop because the malfunction indicator lamp (MIL) was on, the engine lacked power and there was a clacking sound from the high-pressure fuel pump area.
Case Details: When the technician connected the scan tool, he found the following diagnostic trouble codes (DTCs):
- P0089 - Fuel Pump Pressure Regulator Performance
- P00c6 - Fuel Pressure Low During Crank
- P0340 - Intake Cam Sensor Circuit
He also saw a “Reduced Power” message on the dash and noticed that the engine would eventually start after a long crank time.
The technician replaced the high pressure fuel pump and cleared the DTCs. After starting the engine, the same DTCs returned. He went through the factory DTC test procedure for DTC P0340. The test results pointed to replacing the intake cam sensor. He replaced the cam sensor but that didn’t fix the problem.
The technician decided to use a bore scope to see the trigger wheel while hand-cranking the engine over. The trigger wheel did not move. After removing the valve cover, the technician found a broken camshaft between cylinder number four cam lobes and the trigger wheel.
Confirmed Repair: A new camshaft was installed, the DTCs cleared, and the car taken on a lengthy test drive. The engine started normally, ran well and the DTCs did not return. Problem solved!
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