No Upshift/2nd Gear Only After Cold Start-Intermittent DTC 87-High Ratio Error (Replace EPROM)
| Subject: | No Upshift/2nd Gear Only After Cold Start-Intermittent DTC 87-High Ratio Error (Replace EPROM) |
| Models: | 1994-1995 Chevrolet and GMC C, K, P Truck, G Van |
| 1996 Chevrolet and GMC P Truck, G Van |
| Equipped with HYDRA-MATIC 4L80E Automatic Transmission (RPO MT1) |
This bulletin is being revised to correct the electronic formatting. There have been no changes to the content of the bulletin. Please discard Corporate Bulletin Number 67-71-53A (Section 7 - Transmission).
Condition
Some owners may comment about no transmission upshift after a cold start. In conjunction, Diagnostic Trouble Code (DTC) 87 is setting intermittently causing the PCM to command the default action of second gear only.
Cause
The commanded shift to third gear or fourth gear has taken longer than 2 seconds with a minimum 25% TP Sensor reading which has caused DTC 87 to set.
Correction
If normal diagnostics fail to lead to a resolution or the condition cannot be duplicated, replace the EPROM.
Service Information/Procedure
Check the PCM for a current or history DTC 87. If DTC 87 is present, refer to the appropriate Service Manual for diagnosis of DTC 87. Refer to corporate bulletin #577115 for additional information on diagnosing DTC 87. If the diagnosis fails to lead to a resolution and DTC 87 only sets after a cold start, replace the EPROM. Refer to the appropriate Service Manual for EPROM replacement. It is a good idea to verify the new EPROM I.D. with a scan tool against the application listed below.
The service EPROM raises the DTC 87 shift time parameter to 4 seconds and the code enabling temperature to 20°C (68°F).
Parts Information
Important: In 1994, the L65 and L56 engines changed fuel injection pumps that required a new EPROM. The current fuel injection pump will service prior models. Be sure to match the EPROM with the proper engine fuel injection pump.
Transmission Model | Previous Broadcast Code | Previous Scan I.D. | New EPROM Part Number | New Broadcast Code | New Scan I.D. |
|---|---|---|---|---|---|
6.5L L65 | |||||
1995 C/K Pickup | BNDJ or BPAA | 6865 | 16244781 | BXPW | 4735 |
1995 C/K Pickup w/C5B | BNDK or BPAB | 6875 | 16244786 | BXPX | 4745 |
1995 C/K Suburban | BNDL or BPAC | 6885 | 16244788 | BXPY | 4755 |
1995 C/K Pickup w/High Idle-PTO | BNDR or BPAD | 6895 | 16244793 | BXRA | 4775 |
1995 C/K Pickup HD w/C5B, w/High Idle-PTO | BNDS or BPAF | 6905 | 16244796 | BXRB | 4785 |
1995 P Truck | BNDP or BPAH | 6915 | 16244791 | BXPZ | 4765 |
1994 Engine Built through December 1993 with Injection Pump 10225929 | |||||
1994 C/K Pickup | BMSD or BPBN | 7125 | 16244854 | BXRF | 4815 |
1994 C/K Pickup HD w/C5B | BMSF or BPBP | 7135 | 16244860 | BXRH | 4825 |
1994 Engine Built January 1994 and After with Injection Pump 10225930 | |||||
1994 C/K Pickup | BMRM or BPBR | 7145 | 16244871 | BXRJ | 4835 |
1994 C/K Pickup HD w/C5B | BMRN or BPBS | 7155 | 16244873 | BXRK | 4845 |
1994 C/K Pickup w/High Idle-PTO | BMRT or BPBW | 7185 | 16244882 | BXRN | 4875 |
1994 C/K Suburban | BMRP or BPBT | 7165 | 16244877 | BXRL | 4855 |
1994 C/K Pickup HD w/C5B, w/High Idle-PTO | BMRU or BPBX | 7195 | 16244884 | BXRP | 4885 |
1994 P Truck | BMYB or BPBU | 7175 | 16244880 | BXRM | 4865 |
1994 Engine Built Before December 1993 and Serviced with Injection Pump 10225930 | |||||
1994 C/K Pickup | BMSW or BPBK | 7095 | 16244892 | BXRT | 4915 |
1994 C/K Pickup HD w/C5B | BMSX or BPBL | 7105 | 16244894 | BXRU | 4925 |
1994 Suburban | BMSY or BPBM | 7115 | 16244897 | BXRW | 4935 |
6.5L L57 | |||||
1996 P Truck w/C7E | BMKW | 9749 | 16244700 | BXPJ | 5029 |
1996 P Truck w/GT8 | BRBA | 2339 | 16244702 | BXPK | 5039 |
1996 P Truck w/C3D & HC7 | BRBB | 2349 | 16244704 | BXPL | 5049 |
1996 P Truck-Derated w/C7E | BMKX | 9759 | 16244706 | BXPM | 5059 |
1996 P Truck-Derated w/GT8 | BRBC | 2359 | 16244708 | BXPN | 5069 |
1996 P Truck-Derated w/C3D & HC7 | BRBD | 2369 | 16244711 | BXPP | 5079 |
1996 P Truck w/C7P-Snap On Conversion | BNKW | 3669 | 16244693 | BXPD | 4999 |
1996-95 G Van w/54 mph TCC | BRBM | 2789 | 16254610 | CAYU | 4639 |
1996-95 G Van w/59 mph TCC | BUFX | 6789 | 16244686 | BXPA | 4969 |
1996-95 G Van w/41 mph TCC | BKUJ |
| 16254607 | CAYT | 4629 |
1995 P Truck-Derated | BKUK | 3149 | 16244688 | BXPB | 4979 |
1996-95 G Van w/41 mph TCC | BKUL | 3159 | 16244691 | BXPC | 4989 |
1996-95 P Truck w/C7P-Snap On Conversion | BKTY | 3089 | 16244682 | BXNY | 4949 |
1994 G Van w/41 mph TCC, P Truck and AM General | BJDL or BCYH | 7359 | 16254605 | CAYW | 4649 |
1994 G Van w/41 mph TCC | BJDK or BCYF | 7349 | 16244675 | BXNU | 4919 |
1994 G Van w/59 mph TCC | BUFW | 6779 | 16244677 | BXNW | 4929 |
1994 P Truck w/C7P-Snap On Conversion | BKUH | 3129 | 16244671 | BXNS | 4899 |
1994 P Truck-Derated-Frito Lay Conversion | BJDM or BCYK | 7369 | 16244680 | BXNX | 4939 |
6.5L L56 | |||||
1995 C Pickup | BPAJ, BRML or BNDV | 7135 | 16244800 | BXRC | 4795 |
1995 C/K Pickup/Utility | BPAK, BRMM or BNDW | 7145 | 16244850 | BXRD | 4805 |
1994 Engine Built After January 17, 1994 | |||||
1994 C Pickup | BMRK or BPCF | 7265 | 16244887 | BXRR | 4895 |
1994 K Pickup/Utility | BMRL or BPCH | 7275 | 16244890 | BXRS | 4905 |
1994 Engine Built Before January 17, 1994 | |||||
1994 C Pickup | BMXZ or BPDN | 7355 | 16244900 | BXRX | 4945 |
1994 K Pickup/Utility | BMYA or BPDP | 7365 | 16244902 | BXRY | 4955 |
7.4L L19 | |||||
1996-95 G Van w/9C2, NM8 and 1995 C/K Pickup/Utility/Suburban | BPRK, BMHN or BJZY | 0305 | 16252710 | CAJR | 2755 |
1995 C Pickup/Utility/Suburban and P Truck w/NA4, NA5 | BPRM, BMHP, BJZZ or BXST | 0325 | 16252707 | CAJP | 2745 |
1995 C2 Pickup/Utility/Suburban and 1995-1996 G Van w/C5B | BUMU | 8025 | 16244948 | BXSR | 5065 |
1995 C3 w/C5B & K3 Pickup/Utility/Suburban and P Truck | BUMW | 8035 | 16244951 | BXSS | 5075 |
1996-95 G Van w/9C2 | BPRL, BMHN or BKAC | 0315 | 16244953 | BXST | 5085 |
1995 C/K Pickup/Utility/Suburban w/NM8 | BRCU, BMHS or BKAB | 5575 | 16244957 | BXSU | 5095 |
1995 P Truck w/NM8 | BRCW, BMHR or BKAD | 5585 | 16244960 | BXSW | 5135 |
1994 C3 Pickup/Utility/Suburban and P Truck | BUSF | 8325 | 16248376 | BYYB | 8635 |
1994 C/K Pickup/Utility/Suburban w/NM8 | BSRD, BJKX, BHDH or BDRJ | 1275 | 16248381 | BYYD | 8655 |
1994 C3/K3 Pickup/Utility/Suburban w/NM8 | BUSD | 8315 | 16248373 | BYYA | 8625 |
1994 P Truck w/NM8 | BSRB, BJKU, BHDL or BDST | 1255 | 16248378 | BYYC | 8645 |
1994 G Van w/9C2 | BHDJ or BDST | 4725 | 16231740 | BSUT | 1745 |
1994 C/K Pickup/Utility/Suburban, G Van | BSRC, BJKW, BHDF or BDRH | 1265 | 16252712 | CAJS | 2765 |
1994 C/K Pickup/Utility/Suburban | BSRF, BJZK, BDHK or BDSR | 1285 | 16252716 | CAJT | 2775 |
5.7L LO5 | |||||
1995 C/K Pickup/Utility/Suburban, G Van | BNKM or BJZKL | 3475 | 16244933 | BXSJ | 5005 |
1996-95 G Van w/HC4 | BNKN, BLKX or BJZR | 3485 | 16244938 | BXSL | 5025 |
1996-95 G Van w/GT5 | BNKP, BLNY or BJZS | 3495 | 16244941 | BXSM | 5035 |
1995 P Truck | BNKT or BJZP | 3665 | 16244936 | BXSK | 5015 |
1995 P Truck-FED EX Conversion | BMUP | 0815 | 16244943 | BXSN | 5045 |
1995 P Truck w/NM8 & GT4/HC7 | BJZH | 0515 | 16244946 | BXSP | 5055 |
1995 W Truck and P Truck-NPR | BNKR or BJZT | 3505 | 16244962 | BXSX | 5145 |
1994 C/K Pickup/Utility/Suburban, G Van | BLHH, BJDR, BHCU or BDAB | 5995 | 16248344 | BYXN | 8525 |
1994 C Pickup w/C5B | BLHJ, BJDS, BHCW or BDAD | 6005 | 16248347 | BYXP | 8535 |
1994 C/K Pickup/Utility/Suburban, G Van w/NM8 | BJDN, BHCS or BDAC | 7395 | 16248364 | BYXX | 8595 |
1994 G Van w/HF7, 9C2 | BLHL, BJDU, BHCY or BDAK | 6025 | 16248352 | BYXS | 8555 |
1994 G Van w/GT8, 9B9 | BLHK, BJDT, BHCX or BDAJ | 6015 | 16248354 | BYXT | 8565 |
1994 P Truck w/NM8 | BJDP, BHCT or BDRR | 7405 | 16248367 | BYXY | 8605 |
1994 P Truck w/GT4, HC7 | BLHN, BJFJ, BHDA or BDRP | 6045 | 16248350 | BYXR | 8545 |
1994 P Truck-FED EX Conversion | BMSZ | 0365 | 16244964 | BXSY | 5155 |
1994 P Truck w/NM8, GM VENEZ. | BHPS | 5835 | 16248362 | BYXW | 8585 |
1994 C Pickup w/NM8, GM VENEZ. | BHNH | 5655 | 16248360 | BYXU | 8575 |
1994 W Truck and P Truck-NPR | BLHM, BJFH, BHCZ or BDAL | 6035 | 16248371 | BYXZ | 8615 |
4.3L LB4 | |||||
1996-95 G Van | BJXF | 0105 | 16244916 | BXSF | 4985 |
1995 P Truck w/GT5 | BMUN | 0805 | 16244918 | BXSH | 4995 |
1994 C/K Pickup | BHCM or BDAM | 4555 | 16248326 | BYXH | 8445 |
1994 G Van | BHCP or BDAP | 4575 | 16248334 | BYXJ | 8485 |
1994 P Truck | BHCN or BDAN | 4565 | 16248337 | BYXK | 8495 |
1994 P Truck w/GT5 | BNFU | 2855 | 16248340 | BYXL | 8505 |
1994 P Truck w/HC4 | BMTA | 0375 | 16248342 | BYXM | 8515 |
Parts are currently available through GMSPO.
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation | Labor Time |
|---|---|
J6364 | Use published labor operation time |
