Chevrolet P128E: Fuel Rail Pressure Performance

What Does The Chevrolet P128E Code Mean?

During certain engine operating conditions the Engine Control Module (ECM) checks the actual fuel rail pressure reported from the fuel rail pressure sensor and compares the value to a set programed value. If the values are out of the calibrated range for a set amount of time DTC P128E will be set.

What Are The Potential Causes Of The Chevrolet P128E Code?

• Actual fuel rail pressure is below 15 MPa (2175 psi) for greater than 6 s.
• Actual fuel rail pressure exceeds 215 MPa (31,183 psi) for greater than 1 s.

How Can You Fix The Chevrolet P128E Code?

Be sure to thoroughly inspect the Fuel Pressure Regulators for any rust or contamination. Bear in mind that you have to clean and flush the fuel system if there is any debris or contamination.

Recommended Parts

Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:

>>> ACDelco GM Original Equipment 19209059 Fuel Injection Pump, Remanufactured (Renewed)
>>> OKAY MOTOR Fuel Pressure Regulator for 2004 2005 GMC Sierra 2500 HD Chevrolet Silverado 3500 6.6L 0928400653
>>> GM Genuine Parts TP1015 Fuel Filter with Seals

Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!

Reference Sources

• GM, 2013, Service Bullettin – DTCs P0088 And P128E Setting After Fuel System Or Engine Repair.
• GM, 2013, Service Bullettin – 2010 through 2013 6.6L Duramax Fuel Injection Pump Part Restriction.
• GM, 2013, Service Bullettin – Diagnostic Tip – SES MIL On P0087 P0461 P2066 P128E P2632 P2633 P2634 Or P2636 Stored And Unable
  To Command Transfer Pump On With Scan Tool.
• GM, 2013, GM, 2013, Service Bullettin – DTCs P0088 And P128E Setting After Fuel System Or Engine Repair.
• GM, 2014, Service Bullettin – Duramax Diesel Hard Start No Start P0087 P0088 P0191 P128E Or Injection Pump Replacement.
• GM, 2014, Service Bullettin – Diagnostic Tip – 2010 through 2015 6.6L Duramax Fuel System Contamination Identification.