Hummer H1 Service Manual page 220

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DTC Description
P1860 Torque Converter Clutch Pulse Width
Modulation Solenoid Circuit Electri-
cal
P1870 Transmission Component Slipping
P1875 Four-Wheel Drive Low Switch Circuit
Electrical
05745159
Trouble Code Identification
DTC Type
A 1.
2.
3.
4.
5.
B 1.
2.
3.
4.
5.
6.
B 1.
2.
3.
4.
Transmission/Transfer Case
Default Action
The PCM illuminates teh MIL.
The PCM inhibits TCC engagement.
The PCM inhibits fourth gear engagement.
The PCM freezes shift adapts.
DTC P1860 is stored in PCM history
The PCM illuminates the MIL
The PCM commands maximum line pressure.
The PCM inhibits TCC engagement.
The PCM inhibits fourth gear engagement
The PCM freezes shift adapts
DTC P1870 is stored in PCM history
The PCM illuminates the MIL.
The PCM freezes shift adapts.
The PCM assumes a 4wd Lo state if the switch fails
when open, or the PCM assumes a 4wd High state if
the switch fails when closed, for a transmission shift
pattern.
DTC P1875 is stored in PCM history.
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