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Harsh 1-2 Upshift, SES, MIL, or CEL Illuminated, DTC P1870 Set (Replace Valve Body) #01-07-30-023B
Harsh 1-2 Upshift, SES, MIL, or CEL Illuminated, DTC P1870 Set (Replace Valve Body)
1996 Buick Roadmaster
1996 Cadillac Fleetwood
1999-2000 Cadillac Escalade
1996-2000 Chevrolet Camaro, Corvette
1996-2000 Pontiac Firebird
1996-2000 Chevrolet and GMC Light Duty Truck Models
1996-2000 Oldsmobile Bravada
with 4L60-E Automatic Transmission (RPO M30)
Built Prior to January 15, 2000 (Julian Date 0015)
This bulletin is being revised to update VIN Breakpoint Date information and revise the Parts Information table. Please discard Corporate Bulletin Number 01-07-30-023A (Section 07 -- Transmission/Transaxle).
Condition
Some customers may comment on a harsh 1-2 upshift and the Check Engine Light or Service Engine Soon indicator is illuminated.
Diagnosis
Typically, these vehicles will have been driven more than 32,000 km (20,000 mi) before this condition occurs.
The scan tool may show a DTC P1870 set as a history code.
A harsh 1-2 shift or DTC P1870, caused by wear in the control valve body, may be difficult to duplicate when the transmission temperature is below 93°C (200°F).
Cause
The condition may be due to wear in the control valve body. This wear occurs in the bore that contains the TCC isolator and regulator valves, and results in poor, or no, TCC apply.
Important
DTC P1870 is a type B code. The conditions for setting the P1870 DTC must occur on TWO CONSECUTIVE TRIPS (ignition cycles, with a drive cycle) before setting a P1870 history code.
When the conditions for setting DTC P1870 are met (first trip), the PCM commands maximum line pressure and harsh 1-2 shifts are the result.
This may result in a harsh 1-2 shift with no history code if the conditions for setting the DTC required for the second trip are not met, on two consecutive trips (Ignition cycles, with a drive cycle).
When the conditions for setting the DTC are met, on the second consecutive trip, a DTC P1870 is stored as a history code.
When the P1870 code is stored, the PCM will turn on the Service Engine Soon (SES), Check Engine Light (CEL), or Malfunction Indicator Lamp (MIL).
Correction
Install a control valve body with the revised TCC regulator and isolator valves. Refer to the Parts Information table below. These valves are used in all transmissions produced after January 15, 2000 (Julian Date 0015), and all of the service parts currently available through GMSPO contain revised TCC regulator and isolator valves.
Important
If all of the following conditions are true, it is not necessary to rebuild the transmission or to replace additional transmission components beyond the control valve body.
Transmission operation is normal before the transmission reaches operating temperature, or before DTC P1870 is set (no slips, flares, or missing gears).
The torque converter is not blue or overheated.
The transmission fluid is not burned or has no burned odor.
The transmission fluid pan contains no abnormal debris (clutch material, bronze, brass, or metal fragments).
Parts Information
Model Year
Vehicle Platform
Engine (RPO)
Transmission (RPO)
Transmission Broadcast Code
P/N
1996
S Truck
2.2L
(LN2)
4L60-E
(M30)
SAD
24217855
1996
C Truck
(Mexico)
5.7L
(LO5)
4L60-E
(M30)
CPD
24217856
1996
C/K Truck
G Van
5.0L
(L30)
4L60-E
(M30)
CCD, CFD, KBD, WAD, WBD
24217856
1996
C/K Truck
G Van
5.7L
(L31)
4L60-E
(M30)
CHD, CJD, KCD, CMD, CUD, KPD, YDD, FFD, WCD, WHD
24217857
1996
F Car
Y Car
5.7L
(LT1)
4L60-E
(M30)
FFD, YDD
24217857
1996
D Car
5.7L
(L31)
4L60-E
(M30)
AHD
24217857
1996
S/T Truck
M/L Van
4.3L
(L35)
4L60-E
(M30)
TBD,TAD, MSD, MDD
24217860
1996
C/K Truck
G Van
4.3L
(L35)
4L60-E
(M30)
CAD, CBD, KAD
24217861
1996
S/T Truck
4.3L
(LF6)
4L60-E
(M30)
SHD, TLD
24217862
1996
B Car
4.3L
(L99)
4L60-E
(M30)
BBD, BCD
24217863
1996
B Car
(Includes Police Pkg.)
5.7L
(LT1)
4L60-E
(M30)
BFD, BWD, BKD
24217864
1996
F Car
3.8L
(L36)
4L60-E
(M30)
FCD, FBD
24217865
1997
S Truck
2.2L
(LN2)
4L60-E
(M30)
SAD
24217866
1997
C/K Truck
G Van
4.3L
(L35)
4L60-E
(M30)
CAD, CBD, KAD
24217867
1997
S/T Truck
M/L Van
4.3L
(L35)
4.3L
(LF6)
4L60-E
(M30)
SHD, TLD, TBD, TAD, MSD, MDD
24217868
1997
C Truck
(Mexico)
5.7L
(L31)
4L60-E
(M30)
CPD
24217869
1997
C/K Truck
G Van
5.0L
(L30)
4L60-E
(M30)
CCD, CFD, KBD
24217869
1997
C/K Truck
G Van
5.7L
(L31)
4L60-E
(M30)
CJD, CHD, KCD
24217870
1997
F Car
Y Car
5.7L
(LS1)
4L60-E
(M30)
FFD, YDD
24217870
1997
F Car
3.8L
(L36)
4L60-E
(M30)
CFD, FBD
24217871
1998
C/K Truck
G Van
5.7L
(L31) 5.0L (L30)
4L60-E
(M30)
ADD, AFD, AJD, ALD, AWD, CCD, CFD, KBD, CHD, CJD, KCD
24221155
1998-2000
C/K Truck
G Van
S/T Truck
M/L Van
4.3L
(L35) 4.3L (LF6)
4L60-E
(M30)
TAD, MSD, CAD, CBD, KAD, WBD, SHD
24221154
1998-2000
S Truck
2.2L
(LN2) 2.2L (L43)
4L60-E
(M30)
SAD
24221153
1998-2000
F Car
3.8L
(L36)
4L60-E
(M30)
FBD, FCD
24221159
1998-2000
F Car
Y Car
5.7L
(LS1)
4L60-E
(M30)
FFD, YDD
24221158
1998-2000
C/K Truck
(Includes Police Pkg.) G Van
5.7L
(L31) 5.0L (L30)
4L60-E
(M30)
LHD, LSD, LUD, LPD, KXD, CPD
24221161
1999-2000
C/K Truck
4.8L
(LR4)
4L60-E
(M30)
CCD, CFD, KBD
24221162
1999-2000
C/K Truck
5.3L
(LM7)
4L60-E
(M30)
CJD, CHD, KCD
24221162
Parts are currently available from GMSPO.
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation
Description
Labor Time
K6560
Valve Body - R&R or Replace
Use Published Labor Operation Time
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