P2635 on Chevrolet vehicles

A model year is listed because the code is named in its own record — a bulletin filed against it, or an owner’s complaint about it — not because every one of these vehicles sets it. Counts are documents in NHTSA’s files, not failure rates.

Owners’ own words, scrubbed of anything identifying. Unverified reports filed with NHTSA — what was said, not a finding that it was true.

Bulletins and campaigns Chevrolet filed with NHTSA whose summary names P2635. Quote the document number at the service desk — it is a diagnosis the maker has already written down.

• PIP5411A Service bulletin
  2016-08-25 · Engine
• THIS PRELIMINARY INFORMATION COMMUNICATION PROVIDES INFORMATION TO THE TECHNICIAN ABOUT VEHICLES THAT MAY HAVE HESITATION OR A STALLING CONDITION WHILE IN AMBIENT TEMPERATURES 100 DEGREES OR HIGHER. TECHNICIAN MAY FIND DIAGNOSTIC TROUBLE CODES P2635 AND OR P018B SET. DEALER SHOULD COMMUNICATE TO THE CUSTOMER THAT WE APOLOGIZE FOR THIS INCONVENIENCE AND THAT GENERAL MOTORS IS WORKING ON A SOLUTION
• PIP5411B Service bulletin
  2016-09-01 · Fuel System, Gasoline — Storage — Tank Assembly
• THIS PRELIMINARY INFORMATION COMMUNICATION PROVIDES INFORMATION TO THE TECHNICIAN ABOUT VEHICLES THAT MAY HAVE HESITATION OR A STALLING CONDITION WHILE IN AMBIENT TEMPERATURES 100 DEGREES OR HIGHER. TECHNICIAN MAY FIND DIAGNOSTIC TROUBLE CODES P2635 AND OR P018B SET. THE DEALER IS ADVISED TO REPLACE THE IN TANK FUEL PUMP MODULE ASSEMBLY TO CORRECT THE CONDITION.
• PIP5427 Service bulletin
  2016-09-27 · Electrical System
• THIS PRELIMINARY INFORMATION COMMUNICATION PROVIDES INFORMATION TO THE TECHNICIAN ABOUT VEHICLE THAT MAY HAVE A SERVICE ENGINE SOON MALFUNCTION INDICATOR LAMP ON. TECHNICIAN MAY FIND DIAGNOSTIC TROUBLE CODES P2635, U0074 AND OR U18A2. TECHNICIAN WILL NEED TO FOLLOW PUBLISHED DIAGNOSTICS FOR DIAGNOSTIC TROUBLE CODES U0074 WOULD TAKE PRIORITY OVER U18A2 IF BOTH SET BEFORE ADDRESSING DTC P2635.
• PIP5286B Service bulletin
  2019-06-17 · Fuel System, Gasoline
• This Preliminary Information communication provides information to the technician for a vehicle setting both a P2635 and P018B diagnostic trouble codes. The following steps may help to determine if this is caused by a fuel pressure sensor not reading the low end of the pressure range.  Technician is to make sure the engine is cold and install the Multiple Diagnostic Interface along with Global Dia
• 17-NA-171 Service bulletin
  2017-10-01 · Equipment
• Hesitation, Stalling, Engine Speed Flare While Coasting, Unintended Acceleration Feel During a Parking Lot Maneuver, Reduced Surge in Low Speed Maneuvers, Stumble, Harsh Tip-In/Tip-Out, Park-Reverse-Drive Shift Concerns, Harsh Shifts, Erratic Shifts, Engine Vibration, Vibration, Buzz and/or Humming from Steering Wheel, Malfunction Indicator Lamp (MIL) Illuminated - DTC P0097, P054F, P24B1, P24C7,
• 17-NA-335 Service bulletin
  2021-04-15 · Fuel System, Gasoline — Delivery — Hoses, Lines/Piping, And Fittings
• Malfunction Indicator Lamp Illuminated (MIL) - DTC P2635 and/or P018B Set In High Ambient Temperatures With Hesitation, Surging and Stalling Condition Some customers may comment that the Malfunction Indicator Light (MIL) is illuminated. Some customers may also comment on one or more of the following symptoms: • Hesitation • Surging • Stalling Note: In ambient temperatures 100 F (37.7
• PIP5507A Service bulletin
  2017-07-12 · Fuel System, Other — Delivery — Fuel Pump
• This Preliminary information communicatesIn ambient temperatures 100F (37.7 C)degrees or higher, DTCs P2635 and/or P018B may set. The vehicle may also exhibit a hesitation or stalling condition. Excessively Hot and sustained ambient temperatures over 100F (37.7 C) degrees Mainly in TX, AZ, UT, NV, CA, NM (could be any state) causingVapor buildup in fuel feed line. Customers can be advised to utili
• PIP5507B Service bulletin
  2017-07-18 · Fuel System, Gasoline — Delivery — Fuel Pump
• This Preliminary information communicatesIn ambient temperatures 100F (37.7 C)degrees or higher, DTCs P2635 and/or P018B may set. The vehicle may also exhibit a hesitation or stalling condition. Excessively Hot and sustained ambient temperatures over 100F (37.7 C) degrees Mainly in TX, AZ, UT, NV, CA, NM (could be any state) causingVapor buildup in fuel feed line. Customers can be advised to utili
• PIP5507 Service bulletin
  2017-06-30 · Equipment
• This Preliminary information communicatesIn ambient temperatures 100F (37.7 C)degrees or higher, DTCs P2635 and/or P018B may set. The vehicle may also exhibit a hesitation or stalling condition. Excessively Hot and sustained ambient temperatures over 100F (37.7 C) degrees Mainly in TX, AZ, UT, NV, CA, NM (could be any state) causingVapor buildup in fuel feed line. Customers can be advised to utili
• 16-NA-225 Service bulletin
  2017-04-26 · Fuel System, Other — Delivery — Fuel Pump
• This technical bulletin provides a procedure to replace the fuel pump module assembly if the DTC P2635 and/or P018B are set.
• PIP5916A Service bulletin
  2023-05-30 · Engine And Engine Cooling — Engine — Engine Control Module (Ecu/Ecm) — Software
• This Preliminary information communicates that there is a software issue in the ecm  for the following dtc's P062D P163A P163B, P0402 P144E. P2635 which could cause  a crank, no start issue, and how to correct.
• PIP5916B Service bulletin
  2023-05-31 · Engine And Engine Cooling — Engine — Engine Control Module (Ecu/Ecm) — Software
• This Preliminary information communicates that there is a software issue in the ecm  for the following dtc's P062D P163A P163B, P0402 P144E. P2635 which could cause  a crank, no start issue, and how to correct.

A stored code names the test that failed, never the part that caused it. The record above is what Chevrolet and its owners have filed about it; the code’s page across every make has the whole file.