C1991 on the 2003 Ford Expedition
The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.
This code is specific to a manufacturer and is not described here. Its meaning is in the manufacturer's service information.
| 16336 | 2005-04-07. Service bulletin. DIAGNOSTICS FOR DIAGNOSTIC TROUBLE CODE C1991 IN THE ABS (ANTILOCK BRAKE SYSTEM) MODULE - OMITTED FROM WORKSHOP MANUAL - PROCEDURE PROVIDED. *TT |
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| 03132 | 2003-10-29. Service bulletin. THIS ARTICLE ADDRESSES THE PROPER PROCEDURE TO CLEAR DIAGNOSTIC TROUBLE CODES C1990 OR C1991 FROM THE VEHICLE DYNAMICS MODULE/4-WHEEL AIR SUSPENSION MODULE. *TT |
| 16075 | 2002-11-07. Service bulletin. DIAGNOSTIC PROCEDURES FOR DIAGNOSTIC TROUBLE CODE C1991 (MODULE CALIBRATION FAILURE) OMITTED FROM THE WORSHOP MANUAL. *TT |
3 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.