A/T - Intermittent or No TCC Apply, Possible DTC 26/39
Group Ref.: TransmissionBulletin No.: 377136
Date: December, 1993
SUBJECT:
INTERMITTENT OR NO TCC APPLY - POSSIBLE DTC CODE 26 AND/OR DTC CODE 39 (REPLACE TRANSAXLE WIRE HARNESS)
MODELS:
1991-93 CHEVROLET LUMINA
1992-93 CHEVROLET LUMINA APV
1991-93 PONTIAC BONNEVILLE, GRAND PRIX
1992-93 PONTIAC TRANS SPORT
1991-93 OLDSMOBILE NINETY EIGHT, EIGHTY EIGHT, CUTLASS SUPREME
1992-93 OLDSMOBILE SILHOUETTE
1991-92 OLDSMOBILE TORONADO
1991-93 BUICK PARK AVENUE, RIVIERA, LESABRE, REGAL
1991-93 CADILLAC FLEETWOOD, DEVILLE, SIXTY SPECIAL, ELDORADO,
SEVILLE
TRANSAXLE APPLICATIONS:
1991-93 HYDRA-MATIC 4T60-E (RPO M13)
CONDITION: (Figure 1)
Some owners may experience an intermittent or no TCC apply condition. A SES light with DTC 26 and/or DTC Code 39 may be present.
CAUSE: (Figure 2)
The condition may be caused by a short in the internal wiring harness of the transaxle. It was determined the diode wire splice (in the wiring harness) may have the ability to poke into the insulation of the adjacent wire causing a short.
CORRECTION:
To test for the above condition, disconnect the transaxle wiring harness at the TCC solenoid. At the transaxle electrical connector, place one probe of the DVOM at pin "A", and the other probe at pin "D". While monitoring the DVOM, manipulate the wire harness at the diode location. If continuity is present at any time, the transaxle wire harness must be replaced.
SERVICE PART INFORMATION:
The part numbers are for 4T60-E transaxles between model year 1991-1993.
WARRANTY INFORMATION:
Labor Operation: K6554
Labor Time: Use published labor operation time.
Parts are currently available from GMSPO.