This is the code that came up on the machine that reads the codes. I need to know what this means. The code book that I have said that I had to find out from another source.
You jave a biggie here.
here is some info
CIRCUIT DESCRIPTION
The Powertrain Control Module (PCM) monitors the difference between engine speed and transmission output speed. In D3 drive range with the TCC engaged, the engine speed should closely match the transmission output speed. In D4 drive range, with the TCC engaged, the TCC slip speed should be -20 to +60 RPM .
When the PCM detects excessive TCC slip when the TCC should be engaged, then DTC P1870 sets. DTC P1870 is a type B DTC.
CONDITIONS FOR RUNNING THE DTC
CONDITIONS FOR SETTING THE DTC
DTC P1870 sets if the following conditions occur for three TCC cycles during the same trip.
IMPORTANT: The following actions may occur before the DTC sets.If the TCC is commanded ON and at maximum duty cycle for 8.5 seconds , the TP angle is 7-40% , and the transmission slip counter has incremented to either 1 or 2 (out of 3 to increment the fail counter for the current ignition cycle), then the following slip conditions and actions may increment the fail counter for the current ignition cycle:
These conditions must occur sequentially.Condition 1 : If the TCC slip speed is 200-1000 RPM for 7 seconds , then the PCM commands maximum line pressure and freezes shift adapts from being updated.
Condition 2 : If Condition 1 is met and the TCC slip speed is 200-1000 RPM for 7 seconds , then the PCM commands the TCC OFF for 1.5 seconds .
Condition 3 : If Condition 2 is met and the TCC slip speed is 200-1000 RPM for 7 seconds , then the fail counter on the current ignition cycle is incremented.
The above slip conditions and actions may be disregarded if the TCC is commanded OFF at any time as a result of a driving maneuver (sudden acceleration or deceleration).
ACTION TAKEN WHEN THE DTC SETS The PCM illuminates the Malfunction Indicator Lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met.
CONDITIONS FOR CLEARING THE MIL/DTC The PCM turns OFF the MIL during the third consecutive trip in which the diagnostic test runs and passes.
A scan tool can clear the MIL/DTC.
The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without an emission-related diagnostic fault occurring.
The PCM cancels the DTC default actions when the fault no longer exists and/or the ignition switch is OFF long enough in order to power down the PCM.
DIAGNOSTIC AIDS Bronze material found in the transmission oil pan may indicate stator shaft bushing wear. If bushing wear is suspected, inspect the stator shaft and the input (turbine) shaft for damage.
Refer to Symptom Diagnosis for more information.
×
Some times rpms go from 1800 to 2300 45 to 50 mph after truck is warm 2000 gmc sonoma 2.2 700r4 trans
Po123 code 2005 envoy
2,192 views
Usually answered in minutes!
×