PROM - False Service Engine Soon Lights/DTCs 32 or 45

89Chevy29

GMC NUMBER: 89-T-74


GROUP: 6E - Engine Emission

DATE: May, 1989


CORPORATE 936511R
NUMBER.
SUBJECT: FALSE "SERVICE ENGINE SOON "LIGHTS"

MODELS: 1989 C/K/R/V AND G MODELS W/5.0 AND 5.7






Some 1989 C/K, R/V, & G model tracks with TBI engines may experience a False "Service Engine Soon" Light. If Code 32 (EGR Diagnostic) or Code 45 (02 Sensor Rich) cannot be repaired using normal service procedures, a revised calibration PROM should be installed (see attached chart).

IMPORTANT: These new PROMS are for light duty emissions vehicles only (UNDER 8500 LBS. GVW).
For vehicles repaired under warranty, use:

Labor Operation: T0500
Labor Time: .6 HR. C/K/R/V MODELS .7 HR. G MODELS