Really need help-tranny codes
 

So a lil history on the truck. 2003 cad escalade 6.0 AWD. 187k miles. replaced maf sensors, throttle body, cam position sensor, alternator, fuel filter and finally fuel pressure reg. that was all done in last 8 months to correct low idle/stalling problem. Was not road driven for that period of time.

Now the truck shoots codes p0740, p0753, p0758, p0785, p1860. The gear indicator does not light up, the abs, t/c light, parking brake light, and engine light are all on. Symptoms point to ign. Switch which I have replaced twice now with no luck. tranny fluid seems great not burnt and has good color. There is a small fluid leak from a cooler line but I don't think that would cause all of this.
When driven the truck stays in 3rd gear, but can be manually shifted to 2nd. Od does not engage on highway.

I apologize for such a long post but I'm lost with this. Any advice would be extremely appreciated.

Check your relay..??

I am not sure what the P1860 (no such code in 04 Escalade 6.0L) code is but the other three are shift solenoids, and are emission related.

Haven't checked relay yet. Have to try that tomorrow.

How can it be emission related? What part is affected by emission system? And how do I check it?

Thanks for the replies guys

Maybe this will help:

DTC P0740 5.7 L

The torque converter clutch (TCC) solenoid valve is an electrical device that is used with the torque converter clutch pulse width modulation (TCC PWM) solenoid valve in order to control TCC apply and release. The TCC solenoid valve attaches to the transmission case assembly extending into the pump cover. The TCC solenoid valve receives ignition voltage through the power feed circuit. The powertrain control module (PCM) controls the solenoid by providing the ground path on the control circuit. The PCM monitors the throttle position (TP) voltage, the vehicle speed and other inputs in order to determine when to energize the TCC solenoid valve.

When the PCM detects a continuous open, short to ground or short to power in the TCC solenoid valve circuit, then DTC P0740 sets. DTC P0740 is a type B DTC.

The system voltage is 10-18 volts.
The engine speed is greater than 450 RPM for 5 seconds.
The engine is not in fuel cutoff.
Conditions for Setting the DTC
DTC P0740 sets if one of the following conditions occurs for 5 seconds:

The PCM commands the solenoid ON and the voltage feedback remains high (B+).

The PCM commands the solenoid OFF and the voltage feedback remains low (0 volt).

The PCM illuminates the malfunction indicator lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met.
The PCM inhibits TCC engagement.
The PCM inhibits 4th gear if the transmission is in hot mode.
The PCM freezes shift adapts from being updated.
The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Freeze Frame and Failure Records.

The PCM stores DTC P0740 in PCM history 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.

Monitor Ign 1 voltage on the scan tool or hook up a DMM to the trans fuse and make sure you have Ign voltage

Definitely appreciate all the help. Haven't had a chance to work on it lately due to work, hopefully this weekend. Will post up what I find out.

From the codes it almost sounds like the transmission harness is unplugged or has goop in the connector.