Question about 2003 Chevrolet Suburban 1500

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Tow mode switch not activating! is there a fuse?

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Same thing happened to mine. I had to replace the hole shifter handle, works fine now.

Posted on Jul 03, 2009

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Posted on Jan 02, 2017

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There is an icon showing in the speedometer area it looks like a trailer and the car is driving weird like it's in a low gear


That icon looks like the vehicle has been put into tow mode.
When towing or hauling a heavy load, you can activate this feature with a button on the steering wheel, stalks or dash. Activating this mode tells the on board computer to modify the shifting pattern that is better for towing a hauling a heavy load often restricting the gearbox to the lower gear ratios.
  1. The Tow/Haul Light will come on when the system is on.
  2. If the light flashed steadily, have the system serviced.
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Sep 22, 2017 | Cars & Trucks

1 Answer

2006 Chevy express 2500 instrument panel lights stopped working after two wires touched going to tow switch. No blown fuses


Which I/P lights ? Instrument cluster , radio , HVAC control panel etc.... All the I/P light's are controlled by the BCM - body control module . Do you know about electronic control modules ?
DTC B2610 Passenger Compartment Dimming 1 Circuit
The body control module (BCM) receives a variable voltage signal from the instrument panel (I/P) dimmer switch requesting to illuminate the instrument panel controls illumination lamps to a desired intensity. When this occurs, the BCM directly sends a variable voltage based on the I/P dimmer switch position on the backlight lamps control circuit, instrument panel lamps dimming control circuit, and the LED dimming signal circuit.
Voltage for the backlight lamps control circuit, instrument panel lamps dimming control circuit, and the LED dimming signal circuits is from the TBC 3 fuse 16 in the underhood fuse block directly through the BCM to these circuits.

• Perform a visual inspection for loose or poor connections at all related components. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
• A short to ground in the following circuits will cause the TBC 3 fuse to open:
- The backlight lamps control
- The instrument panel lamps dimming control
- The LED dimming signal
- Battery positive voltage from the underhood fuse block TBC 3 fuse
• An open in the TBC 3 fuse will cause the BCM to set the following DTC:
- B0951
- B2610
- B2625

DTC B2615 Passenger Compartment Dimming 2 Circuit
DTC B2620 Display Dimming Pulse Width Modulation (PWM) Input Circuit
DTC B2625 Display Dimming Pulse Width Modulation (PWM) Output Circuit
Do you know how to Test for a high resistance, an open, a short to ground, or a short to voltage in the following circuits. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
• 5-volt reference
• The dimming input
• The dimming return

Tow/Haul mode enables the operator to achieve enhanced shift performance when towing or hauling a load. When tow/haul mode is selected, the tow/haul switch input signal to the body control module (BCM) is momentarily toggled to zero volts. This signals the powertrain control module (PCM) or transmission control module (TCM) to extend the length of time between upshifts and increase transmission line pressure. Cycling the tow/haul switch again disables tow/haul mode and returns the transmission to a normal shift pattern.

After reading all the pertinent info. to your problem, doing testing ,Checking for DTC'S -diagnostic trouble codes in the BCM , checking power and ground's for the BCM an checking voltage at the tow / haul switch to and from the BCM .is where i would start . Do you know how to do electrical testing ? Read a wire diagram ? If not there are videos on youtube for learning how to do basic automotive electrical testing , how to read wiring diagrams etc... You can find free wiring diagrams at
http://www.bbbind.com/free_tsb.html The only thing with this is you don't have info. saying where componet location's are . This is were factory service info would be helpful

Jan 04, 2017 | Cars & Trucks

1 Answer

What would cause my TAHOE TOW/HAUL mode to engage on its own?


You need to have a diagnostic scan tool hooked up ,glitch in one of the control modules or a wire in the circuit shorting to ground ! probably something simple but hard to find ! With a factory scan tool they can check the input signal to the BCM ,PCM .
Tow/Haul mode enables the operator to achieve enhanced shift performance when towing or hauling a load. When tow/haul mode is selected, the tow/haul switch input signal to the body control module (BCM) is momentarily toggled to zero volts. This signals the powertrain control module (PCM) or transmission control module (TCM) to extend the length of time between upshifts and increase transmission line pressure. Cycling the tow/haul switch again, or cycling the ignition switch disables tow/haul mode and returns the transmission to a normal shift pattern.

Sep 23, 2015 | Cars & Trucks

1 Answer

Why Towing Issues! Overheats and then Limp In Mode. Stop/Shut Down/Prime Fuel System, good for a short while?


Most German cars have a heat sender unit when malfunctions creates engine management problems, fuel pump may be faulty, check fan switch for activating issues.

Dec 17, 2014 | Cars & Trucks

1 Answer

97 lincoln contintal was towed,will turn over but will ot start


look in the user manual for fuel shutoff switch which might be activated by towing. Normally this is only activated in an accident...

Apr 18, 2014 | 1997 Lincoln Continental

1 Answer

Limp mode issues


You need to find out the transaxle strategy for going into
limp mode
You need a trans shop or a dealer
Have it towed on a rollback ,not flat towed or driven

Jul 24, 2013 | 1999 Mitsubishi Galant

1 Answer

Fuse box ticking, no power


Without trouble shooting ,would only be guessing . Could be any number of thing's . You have no idea the complexity of the electronic's on this vehicle . All the different control modules , serial data communication network . You probably don't even know what's happening just turning the key to start the start position .
For ignition switch power modes refer to Body Control System Description and Operation. Once the ignition is placed in the Run/Crank position, the control circuit of the Run/Crank relay is grounded by the body control module (BCM). With the Run/Crank relay switch closed, battery positive voltage flows through it and on to the park/neutral position (PNP) switch. With the PNP switch in either the Park or Neutral position, battery positive voltage will flow to the starter relay coil supply voltage input terminal of the powertrain control module and the coil side of the starter relay. Placing the ignition in the START position sends a message to the engine control module (ECM)/powertrain control module (PCM) requesting engine start. If the ECM/PCM has determined that the transmission is in Park or Neutral and theft is not active, it will ground the control circuit of the starter relay. Battery positive voltage will then flow through the switch side of the starter relay to the S terminal of the starter solenoid, cranking the engine. For remote vehicle start (RVS) information, refer to Keyless Entry System Description and Operation.

Power Mode Master
This vehicles body control module (BCM) functions as the power mode master (PMM). Refer to Power Mode Description and Operation for a complete description of power mode functions.

Power to many of this vehicle's circuits are controlled by the module that is designated the power mode master (PMM). This vehicle's PMM is the body control module (BCM). The PMM controls which power mode (Run, Accessory, Crank, Retained Accessory Power, or Off) is active.
Serial Data Power Mode Master
On vehicles that have several control modules connected by serial data circuits, one module is the power mode master (PMM). On this vehicle, the PMM is the body control module (BCM). The PMM receives 3 discrete ignition switch signals to differentiate which power mode will be sent over the Serial Data circuits. The 3-wire Ignition Switch table below illustrates the state of these inputs in correspondence to the ignition switch position:

Relay Controlled Power Mode
The body control module (BCM) uses the discrete ignition switch inputs Off/Run/Crank, Accessory, and ignition 1, to distinguish the correct power mode. The ignition 1 circuit is also routed to the Run/Crank relay for relay controlled power feeds during the appropriate power mode. The BCM, after determining the desired power mode, will activate the appropriate relays for that power mode.
The first step in the diagnostic procedure chart would be to hook up the Tech2 - factory scan tool an check all the modules on the vehicle for DTC'S - diagnostic trouble code's .
Your best bet have it towed to a qualified repair shop .

Jan 13, 2018 | 2006 Chevrolet Malibu

1 Answer

2001 gmc yukon tow haul engaging disengaing on its on


could be the switch or modual.check wiring for worn through or earthing.

Feb 09, 2018 | GMC Yukon Cars & Trucks

2 Answers

4wd 1996 subaru how do i activate or engage 4wd


All Subies are AWD 24/7
There is a towing fuse located under the hood. If it is missing (or blown) - the vehicle will only be FWD (for instances you need to tow).
Check the fuse is in place and good.

Consult your owner's manual for the location... (usually passenger side firewall.

Thanks!

Nov 07, 2011 | 1996 Subaru Legacy

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