2014 2500HD tow haul not working

[ss454rpo]

I just replaced the old shift lever with a new OEM lever. Still not working. Are there any fuses or relay's I need to look at?

 

[1FastBrick]

This is what I found for testing the circuit on that vehicle.​

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Circuit/System Verification​

1. Ignition ON, cycle the Tow/Haul switch while observing the Tow/Haul switch parameter on the scan tool in the Transmission Controls Data list. The Tow/Haul switch parameter should change states from NO to YES, or YES to NO with each cycle of the switch.
2. Operate the vehicle within the Conditions for Running the DTC to verify that the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.

Circuit/System Testing​

1. Ignition OFF, transmission in Park, disconnect the automatic transmission shift lever electrical connector.
2. Ignition OFF test for less than 1  ohm between terminal  2 on the automatic transmission shift lever vehicle harness connector and ground at the battery negative post.

3. ⇒X	If greater than the specified valve test the ground circuit for an open/high resistance.

4. Ignition ON, test for greater than 11  volts on the signal circuit terminal  1 on the automatic transmission shift lever vehicle harness connector, and ground at the battery negative post.

5. ⇒X	If not within the specified value, test the signal circuit for a short to ground or an open/high resistance. If all circuits test normal, replace the BCM.

6. Ignition OFF, test for less than 3  ohms between terminal  1 and terminal  2 on the automatic transmission shift lever component harness connector while depressing the Tow/Haul switch button.

7. ⇒X	If greater than the specified value, replace the automatic transmission shift lever assembly.

8. If all circuits test normal, replace the BCM.

S74 Tow/Haul Mode Switch

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Connector Part Information Harness Type: POA-ST_CLM OEM Connector: 12064761 Service Connector: SEE NOTE Description: 4-Way M Metri Pack 150 Series (BK)

Terminal Part Information

Terminal Type ID​	Terminated Lead​	Diagnostic Test Probe​	Terminal Removal Tool​	Service Terminal​	Tray​	Core Crimp​	Insulation Crimp​
I​	Pending​	Pending​	Pending​	Pending​	Pending​	Pending​	Pending​

S74 Tow/Haul Mode Switch

Pin​	Size​	Color​	Circuit​	Function​	Terminal Type ID​	Option​
A​	0.5​	BK/WH​	1851​	Signal Ground​	I​	-​
B​	0.35​	BU/GY​	553​	Shift Select Switch Performance Signal​	I​	-​
C-D​	-​	-​	-​	Not Occupied​	-​	-​

 

[1FastBrick]

There is also a service bulletin If the some of the various lamps do not illuminate. But I would suspect you would need more than just 1 item for this to be the cause.

#PIP4401E: TOW/HAUL CRUISE SES 4X4 HEATED WASHER FLUID OFF MESSAGE AND VARIOUS OTHER INDICATOR LAMPS DO NOT ILLUMINATE (JUN 13, 2014)​

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Subject: Tow/Haul Cruise SES 4x4 Heated Washer Fluid Off Message And Various Other Indicator Lamps Do Not Illuminate Models: 2007 - 2014 Cadillac Escalade Models 2007 - 2013 Chevrolet Avalanche, Silverado, Suburban, Tahoe 2014 Chevrolet Silverado 2500/3500, Suburban, Tahoe 2007 - 2013 GMC Sierra, Yukon Models 2014 GMC Sierra 2500/3500, Yukon Models

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This PI was superseded to update Condition/Concern and Model Years. Please discard PIP4401D.

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The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern​

Customers may comment that the check engine light, tow/haul, SIR, cruise control or other various indicators or warning lamps will not come on in the instrument panel. Vehicles equipped with manual shift transfer cases may also have an inoperative 4x4 indicator lamp when the transfer case is shifted into 4-wheel drive. Vehicles equipped with an electronic compass, displayed in the DIC, may have an inoperative compass. Vehicles may display HEATED WASHER FLUID OFF message in DIC, even though vehicle is not equipped with the system.

Recommendation/Instructions​

Using the Tech 2, command the instrument panel indicator lights on. If the suspect indicator lights do not come on when commanded, inspect the AUX HVAC 10 amp fuse in the under hood fuse block and associated circuit for an open or high resistance. If the lamps do come on when commanded, follow published diagnosis listed in SI associated with the illuminated indicator lamp.