P0091 Diagnostic Trouble Code Discussion for October 2025
Fuel Pressure Regulator 1 Control Circuit Low Voltage
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| Help Request | Posted | |
| 2018 GMC Acadia SLT 3.6L MIL Lamp on, Reduced power mode VIN: 1GKKNSLS3J P0091: Fuel pressure regulator low / short to ground. ... from previous repair attempt from DIYer. We replaced engine with used. Car runs great until hard accel. It will go into reduced engine power mode and sets a p0091. It has set a P163A a couple times, but usually sets the P0091. The code says the FP... |
October 14, 2025 |
