Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
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The most common cause for the P0089 to set on your CTS is in most cases a failing high pressure fuel pump. Do you have access to a scan tool that can read the fuel pressure values while the problem is occurring?
Sorry the CTS was a typo on my part but the answer remains the same. You will want to check the Fuel Rail Pressure Sensor value on the scanner. The pressure should be approximately 3.5–5.5 MPa (508–798 PSI). Attempt to command the fuel pressure high using the scanner. The high pressure pump on your 3.6 is not in the tank, it mount to the engine . See the link below.https://dl.dropboxusercontent.com/u/104923897/High%20pressure%20fuel%20pump%20Jun%2019.pdf
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