Service bulletins for the 2004 GMC Sierra
A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.
927 on file from NHTSA, as of 2026-10-19.
About P0721 on the 2004 GMC Sierra: what the code means, and the bulletins and recalls about the same components.
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By component
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Only bulletins with trouble code: P0721 are shown. Show all
| 3155 | 2005-05-11. Service bulletin. ELECTRICAL SYSTEM. NO SHIFT, SPEEDOMETER ERRATIC/INOPERATIVE, P0721 C0237 P0500 C0055. *TT |
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| 01493 | 2004-03-02. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. ALLISON LCT1000 PRNDL FLASH AND/OR WILL NOT MOVE WITH P0721, P0731, P0732, P0733, P0734, P0743, P0746, P0747, P0776, P0777, P1720, P1721, P1723 AND P1724. *TT |
| 00574A | 2004-02-27. Service bulletin. ELECTRICAL SYSTEM. ALLISON LCT1000 NO SHIFT, SPEEDOMETER ERRATIC/INOPERATIVE, DIAGNOSTIC TROUBLE CODES (DTCS) P0721, C0237 POSSIBLE ANTI-LOCK BRAKE SYSTEM (ABS) LAMP ON. SI BULLETIN 1408789. *TT |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.