How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Juan Crespo Your Own Question
Juan Crespo
Juan Crespo, ASE Certified Technician
Category: GM
Satisfied Customers: 1495
Experience:  A.S.E. Master Technician, Advanced Level, Emissions - Asian, Domestic, & European
Type Your GM Question Here...
Juan Crespo is online now
A new question is answered every 9 seconds

U0109, 09 buick enclave, I'm a owner of a shop. checked fuel

Customer Question

JA: What is the model/year of your GM?
Customer: 09 buick enclave
JA: Are you fixing your Enclave yourself? What have you tried so far?
Customer: I'm a owner of a shop. checked fuel pressure. bypassed the modual and made fuel pump work , scan tool says no commumication to modual
JA: How many miles are on the vehicle? And when was it last serviced?
Customer: 133214
JA: Anything else you want the mechanic to know before I connect you?
Customer: that's all I know
Submitted: 14 days ago.
Category: GM
Expert:  Juan Crespo replied 14 days ago.

Hi there.

Most likely, the fuel pressure control module (FPCM) has failed; however, there is also the possibility of a bad connection. Disconnect the module and make sure both sides of the connection are clean with no corrosion or bent pins. Spray WD-40 liberally on both sides and re-connect. Erase the codes and try to start the engine. If engine still won't start and code U0109 returns, the FCPM will need to be replaced and the new unit programmed to the VIN.

Best Regards.