2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2689

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2689

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P0842

- Transmission Fluid Pressure (TFP) Switch 1 Circuit Low Voltage

DTC P0843

- Transmission Fluid Pressure (TFP) Switch 1 Circuit High Voltage

Diagnostic Fault Information

Typical Scan Tool Data

Circuit/System Description

The transmission fluid pressure (TFP) switch 1 is part of the control solenoid valve assembly which has no serviceable parts. The TCM supplies a

signal circuit to the TFP Switch 1. The TFP Switch 1 has an internal case ground. TFP Switch 1 is normally closed or LOW. When oil pressure is

present at the TFP Switch 1, the switch is open or HIGH. The normally high clutch pressure control (PC) solenoid 2 controls pressure to the 3-5

reverse clutch regulator valve. The TCM monitors the TFP switch 1 to determine the position of the 3-5 reverse clutch regulator valve. When the

3-5 reverse clutch is commanded OFF, pressure is present on the TFP switch 1. When the 3-5 reverse clutch is commanded ON, the 3-5 reverse

clutch regulator valve moves and pressure to the TFP switch 1 is exhausted through the 3-5 reverse clutch regulator valve.

Conditions for Running the DTC

P0842 or P0843

* DTCs P0751, P0752, P0756, P0757, P0973, P0974, P0977, P1825 or P1915 are not set.

* Ignition voltage is 8.6 volts or greater.

* The transmission fluid temperature (TFT) is 0-120掳C (32-248掳F).

* Engine speed is 500 RPM or greater for 5 seconds.

Conditions for Setting the DTC

P0842

The TCM detects that the TFP switch 1 signal voltage remains LOW after the 3-5-R clutch transitions from a HIGH pressure state to a LOW

pressure state. The TCM counts each incident. The DTC sets when 35 counts are accumulated.

P0843

The TCM detects that the TFP switch 1 signal voltage remains HIGH after the 3-5-R clutch transitions from a LOW pressure state to a HIGH

pressure state. The TCM counts each incident. The DTC sets when 25 counts are accumulated.

Action Taken When the DTC Sets

* DTCs P0842 and P0843 are Type C DTCs.

* The TCM freezes transmission adaptive functions.

Conditions for Clearing the DTC

DTCs P0842 and P0843 are Type C DTCs.