U18A2 · Manufacturer communications

CHEVROLET · 2025-01-07

This service bulletin provides repair information to correct a customer concern of Service Engine Soon Illuminated in DIC and/or a Malfunctioning Fuel Gauge with DTC U0076/U18A2/P1001/P1434 or Other Message Counter Incorrect Codes Set.

CHEVROLET · 2024-02-27

This service bulletin provides repair information to correct a customer concern of Service Engine Soon Illuminated in DIC and/or a Malfunctioning Fuel Gauge with DTC U0076/U18A2/P1001/P1434 or Other Message Counter Incorrect Codes Set.

CHEVROLET · 2022-08-26

This service bulletin provides repair information to correct a customer concern of Service Engine Soon Illuminated in DIC and/or a Malfunctioning Fuel Gauge with DTC U0076/U18A2/P1001/P1434 or Other Message Counter Incorrect Codes Set.

CHEVROLET, GMC · 2020-03-11

This technical bulletin is providing a procedure to reprogram the ECM to correct a condition of Runs Rough Cold or Stall Condition Upon Cold Start and/or DTC U18A2 Set (North America /Middle East- Terrain Only).

CHEVROLET, GMC · 2020-01-23

This technical bulletin is providing a procedure to reprogram the ECM to correct a condition of Runs Rough Cold or Stall Condition Upon Cold Start and/or DTC U18A2 Set (Mexico Only) due to software concerns.

CHEVROLET, GMC · 2020-01-23

This technical bulletin is providing a procedure to reprogram the ECM to correct a condition of Runs Rough Cold or Stall Condition Upon Cold Start and/or DTC U18A2 Set (North America Only).

CHEVROLET, GMC · 2019-10-02

N192267870 - Service Update. Certain vehicles have a new feature that notifies customers via text or email of a low battery voltage. This feature will not function if the voltage becomes low and the vehicles is In Off Power Mode. A service engine soon (SES) light will illuminate upon starting or jump starting the vehicle and multiple U-Codes will be stored in the engine control module (ECM). The U-Code combinations will include two or more of the following codes: U0101, U0102, U0129, U0140, U18A2. Dealers are to reprogram the ECM.

CADILLAC, CHEVROLET, GMC · 2019-03-06

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.

CADILLAC, CHEVROLET, GMC · 2017-08-16

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.

CADILLAC, CHEVROLET, GMC · 2016-09-27

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.

CHEVROLET · 2016-05-11

This technical bulletin provides diagnostic information for malfunction indicator lamp (MIL) illuminated, DTC U18A2 and/or P018B.

CHEVROLET · 2013-04-19

This Preliminary Information communication provides information to the technician about vehicles that have a Service Engine Soon Malfunction Indicator Lamp on and an open Fuse F12DA 20 amp open. Technician will find Diagnostic Trouble Codes P06A3, P2122, P2635, and U18A2.Tech will inspect for the main engine wire harness making contact with the right rear corner of the engine or cam/valve cover. Technician should repair the affected circuit, wrap the harness with additional protective tape and route the harness away from suspect areas of engine component contact.