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

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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

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

2 Answers

What is the function of the switch P/N by the transmission stick


It is the Power -vs- Normal switch. In Power (P) mode, the shift points on your transmission are extended so you can accelerate quicker. The Normal (N) mode is for typical driving and will increase your gas mileage.

Sep 06, 2009 | 2001 Suzuki Grand Vitara

2 Answers

Trailer towing fuses


Battery junction box (BJB) fuse(s):
  • 5 (30A) (trailer electric brake controller)
  • 34 (25A) (trailer tow turn relays)
  • 42 (30A) (trailer tow parking lamps)
  • 44 (30A) (trailer tow battery charge relay switch side)
  • 63 (15A) (trailer tow reversing lamps

Mar 20, 2009 | 2008 Ford F 250 Super Duty 4WD

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