2004.5-2005 CHEVROLET SILVERADO 2500HD. 2004.5-2005 GMC SIERRA 2500HD. 2006 HUMMER H1 ALPHA. Potential Related Diagnostic Trouble Codes (DTC’s). DTC P0087 Fuel Rail Pressure (FRP) Too Low. DTC P0088 Fuel Rail Pressure (FRP) Too High. DTC P0089 Fuel Pressure Regulator Performance. DTC P0090 Fuel Pressure Regulator Control Circuit. 1 x OEM BOSCH Duramax Diesel LLY Fuel […]