P0121 · Communications du constructeur

BUICK, CHEVROLET · 2026-05-04

This Preliminary information communicates to the technician the diagnostic direction necessary to address MIL illumination with DTCs P0121, P0299, P1101 or P00C7.

BUICK, CADILLAC, CHEVROLET, GMC, HUMMER, PONTIAC, SAAB · 2017-12-18

This PI was superseded to update model years and add information concerning idle surge, reduced engine power mode, and/or DTCs P0068, P0121, P1516, P2101, P2119, and/or P2176 that may be experienced on high mileage vehicles. Please discard PIP4578.

CADILLAC · 2017-03-23

17096 - Service Update. Certain vehicles, may have a condition in which the engine air filter element does not have glue beads across the paper pleating. If this condition is present the pleats can fold over on themselves during high-RPM aggressive driving, and restrict the airflow, which may collapse the air duct and cause the engine to stall. Additionally, the air duct could be cut and a malfunction indicator lamp could illuminate with diagnostic trouble codes P0121-00, P2101-00 and P2119-00 stored. Replace the air filter element and, if necessary, replace the air duct.

CADILLAC · 2016-10-05

This Preliminary Information communication provides information to the technician about vehicles that the engine may shut off after wide open throttle maneuvers also the Service Engine Soon Malfunction Indicator Lamp on. Technician may find Diagnostic Trouble Codes P0121, P2101 and P2119 set. Dealer should inspect the air-filter to make sure it is correct. Technician should replace the air filter if it is incorrect. Also air duct should be replaced with the air filter.

CADILLAC · 2016-09-23

THIS PRELIMINARY INFORMATION COMMUNICATION PROVIDES INFORMATION TO THE TECHNICIAN ABOUT VEHICLES THAT THE ENGINE MAY SHUT OFF AFTER WIDE OPEN THROTTLE MANEUVERS ALSO THE SERVICE ENGINE SOON MALFUNCTION INDICATOR LAMP ON. TECHNICIAN MAY FIND DIAGNOSTIC TROUBLE CODES P0121, P2101 AND P2119 SET. DEALER SHOULD COMMUNICATE TO THE CUSTOMER NOT TO DRIVE THE VEHICLE AGGRESSIVELY ON TRACK LIKE CONDITIONS. DEALER SHOULD ALSO ADVISE THE CUSTOMER ENGINEERING WORKING ON FIX TO ADDRESS THIS ISSUE.

CHEVROLET, GMC · 2015-10-01

This preliminary informational bulletin provides repair information on Engine Control Module (ECM) reprogramming to correct a customer concern of experiencing a slight hesitation and/or sag. Upon further inspection, DTCs P0101, P0106, P0121, P1101 may be set.

AUDI · 2013-03-14

AUDI: 01 MIL ON P1545, P0121, P0123, P0221, OR P0222 STORED IN ECM. A NUMBER OF INCIDENT MEMORY ENTRIES WITH REGARD TO THROTTLE VALVE ARE STORED IN THE ECM. IN MOST CASES, THE ENTRIES ARE SPORADIC. *JS UPDATED 04/15/2013 *JS

AUDI · 2013-02-22

MIL on (P1545, P0121, P0123, P0221 or P0222 stored in ECM)

UNKNOWN · 2009-06-01

POOR ACCELERATION, DETONATION OR PING AT IDLE IN DRIVE OR REVERSE, AND/OR POSSIBLE DIAGNOSTIC TROUBLE CODE P0101, P0106, P0121. 96 - 06 ALL GENERAL MOTORS PASSENGER VEHICLES AND LIGHT DUTY TRUCKS. *TT PASSENGER VEHICLES FROM 1996-2009. UPDATED 6/11/10. *PE

VOLKSWAGEN · 2007-10-26

EPC WARNING LIGHT ON AND/OR THROTTLE BODY DTC P0121/P0221 STORED IN ECM FAULT MEMORY. *NJ

BUICK, CADILLAC · 2006-11-01

REDUCED ENGINE POWER, SERVICE ENGINE SOON (SES) LIGHT WITH ONE OR MORE OF THE FOLLOWING DTCS P0121, P0221, P2119, P2122, P2138, P2176. *TT UPDATED 08-20-07. *KB

HYUNDAI · 2005-04-01

ECM REPROGRAMMING INSTRUCTIONS FOR DTC P0121 IN HIGH ALTITUDE REGIONS. *SC

CADILLAC · 2004-01-01

INTERMITTENT NO POWER, STALL, MALFUNCTION INDICATOR LAMP (MIL) WITH TPS, TAC, TCM DIAGNOSTIC TROUBLE CODES (DTCS) SET P0120, P0121, P0122, P0123, P0220, P0221, P0223, P0225, P0226, P0227, P0228, P0638, P0700, P1779, P1780, P1995, P2119, P2176. *TT

SATURN · 2003-09-01

MALFUNCTION INDICATOR LAMP (MIL) SERVICE ENGINE SOON TELLTALE LAMP ON, REDUCED POWER LAMP MAY ILLUMINATE WITH DIAGNOSTIC TROUBLE CODES P0121, P0221, AND/OR P2135. *TT

JAGUAR · 2002-11-01

CHECK ENGINE MALFUNCTION INDICATOR LAMP - DIAGNOSTIC TROUBLE CODE P0121 FLAGGED - CONNECTOR MATERIAL MISMATCH - AJ27 ENGINES - MODIFY HARNESS. *TT

HONDA · 2002-05-20

SUBJECT REGARDING MULTIPLE APS DIAGNOSTIC TROUBLE CODES P1271, P1272, P1273, P0121. *TT

CADILLAC · 2002-01-09

CONCERNS WITH DIAGNOSTIC CODES P0420, CONVERTER EFFICIENCY, P0121 TPS PERFORMANCE AND P0133 AND P0153, O2 SENSOR SLOW RESPONSE. *TT