Engine Controls - Service Engine Soon Light, Code 53
89cadillac04Bulletin No. T-89-81
File in Group 6E
Number 69
Corp. Ref. No. 918106
Date March, 1989
SUBJECT: SERVICE ENGINE SOON LIGHT - CODE 53
MODELS AFFECTED: 1988 BROUGHAMS EQUIPPED WITH CALIFORNIA EMISSIONS (NB2)
Some 1988 Broughams equipped with California emission systems, option code NB2, may experience a "Service Engine Soon" light with a diagnostic code 53. Code 53 indicates an EGR system malfunction and should be diagnosed using the procedures in the 1989 Brougham Service Information Manual.