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2018 GMC Acadia SLT 3.6L MIL Lamp on, Reduced power mode
Posted to GM Driveability on 10/14/2025 2 Replies

Car came in with broken timing chain 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 t...

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car Vehicle Data

2018 GMC Acadia SLT

VIN 1GKKNSLS3J
Engine3.6 L / 6 cyl / GAS
Trans6-speed Automatic (Electronic)
DeliveryFuel Injection / DIRECT INJECTION
EmissionsOBD-II Compliant
SymptomsMIL Lamp on, Reduced Power Mode
OccursUnder Load, on Accel

Trouble Codes

P0091Fuel Pressure Regulator 1 Control Circuit Low
P163AFuel pressure regulator circuit performance
Open Help Request

car Vehicle Data

2018 GMC Acadia SLT

VIN 1GKKNSLS3J
Engine3.6 L / 6 cyl / GAS
Trans6-speed Automatic (Electronic)
DeliveryFuel Injection / DIRECT INJECTION
EmissionsOBD-II Compliant
SymptomsMIL Lamp on, Reduced Power Mode
OccursUnder Load, on Accel

Trouble Codes

P0091Fuel Pressure Regulator 1 Control Circuit Low
P163AFuel pressure regulator circuit performance