Jump to content
  • Sign up for FREE! Become a GM-Trucks.com Member Today!

    In 20 seconds you can become part of the worlds largest and oldest community discussing General Motors, Chevrolet and GMC branded pickups, crossovers, and SUVs. From buying research to owner support, join 1.5 MILLION GM Truck Enthusiasts every month who use GM-Trucks.com as a daily part of their ownership experience. 

Sign in to follow this  
worktruck2011

How-To: Ignition Switch Replacement/P1682 Repair.

Recommended Posts

Maybe this will help anyone who has a truck that turns over, but won't start. P1682 is the code on the computer... Here are the technical details on this code:


P1682 Chevrolet Description

There are 2 ignition 1 voltage circuits supplied to the Engine Control Module (ECM). The first ignition circuit is provided by the powertrain relay, through a fuse. This ignition 1 voltage circuit supplies power to all the internal ECM circuits associated with the throttle actuator control (TAC) operation. The second ignition 1 voltage circuit is supplied by the run/crank relay through a fuse, and is used to power the remaining internal ECM circuits. If the ECM detects a voltage difference between the 2 ignition 1 voltage circuits, DTC P1682 will set.

P1682 Chevrolet - Ignition 1 Switch Circuit 2

Possible causes
- Faulty ignition switch
- Ignition Switch harness is open or shorted
- Ignition Switch circuit poor electrical connection
- Faulty Engine Control Module (ECM)


When is the code detected?
The ECM has detected a voltage diference between two circuits

Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible no crank or start



I decided to replace the ignition switch because that's what other people had done and it was cheaper than a dealership diagnostic. Besides this one code, my instrument console also threw up warnings about servicing the traction control, anti-lock brake system and some other alarming messages. Including that the engine power was reduced!


The ignition switch on my 2011 Silverado is part # 40 in this diagram:

MaTufuKl.jpg

To get at it you probably need to drop the interior trim panel below the steering column.

Once that's done you need to pull out the steering wheel tilt lever part #20. It should unplug strait out with a screwdriver.

Then you unclip the plastic shroud part #22 and #1

Then you unclip the connector going to the Key Chip Sensor #2. And unclip the wiring harness that plugs into the ignition switch. CAUTION: You might have a red plastic locking clip in the harness that needs to be disengaged before the connector will come out.

The next step is to remove the lock cylinder. You'll need a pick. Here is a video of someone doing it on a similar vehicle:



You can then unclip the Key Chip Sensor #2 and set it aside.

You will then have to unhook the white key sensor that that's mounted on the ignition switch case #3 you just removed the key cylinder from.

You'll need a small screw driver to push on a plastic tab to unlock it. Once that's done it should rotate easily for removal. If you break it off, it's not a big deal since it's part of the ignition switch you're replacing... even so, I'd practice on this one so you'll be better at removing it if need be in a later step:

mukZTN2l.jpg


You can now remove the ignition switch. You'll need two small screw drivers or nails to push into the two square holes to the left and right of the "black hole" shown in the picture below:


10ZEPudl.jpg?1

This video is also good to watch before starting this project:




Now the ignition switch I pulled out of my 2011 Silverado was GM Part #25733005 ; D1485F (DO NOT USE)

The dealership I contacted said that part had been replaced with GM Part# 22887691 which makes sense since the previous one died. Hopefully the new part lasts longer!

Installing the switch is pretty much a reverse of the original process. The only issue is that you need to get your ignition cylinder and the switch gears aligned properly. I had to remove and replace the ignition switch and lock cylinder (and the key security chip reader) a few times before I was able to get the gears on the switch to be correct. (The guy in the second video explains how to align it, but I either didn't pay close enough attention or couldn't do it quite right)

 

You'll also need to clear the code once your vehicle is working again.


$_35.JPGk6M6IpCm.jpg

 

 

 

Hope this helps someone else!

Edited by worktruck2011

Share this post


Link to post
Share on other sites

I think this is what i need to do on my 2014 Chevrolet chassis RV. Thank you

Sent from my SM-G930V using Tapatalk

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

  • Similar Content

    • By BrooklynBowTie
      What’s the cheapest most efficient 3/5, 4/6 lowering kit or drop for a 2014 Silverado crew cab standard bed 2wd 5.3???
    • By Ricky Harper
      I have a 2010 Chevy Silverado 1500 2 wheel drive 4.3l v6 and the transmission went out yesterday. I was wondering what transmissions are interchangeable with my truck. Please help. 
    • By David Gethers
      I recently purchased a '17 Silverado Hd 2500 Duramax, and I swear it has been back to the dealer more than I've had ( exaggeration ). But more recently I have developed
      the same issue with hard vibration at highway speeds, feeling like the steering wheel is about to come free. I literally just got the truck back yesterday , only to find out that they
      pretty much just let my vehicle sit for two days while they did nothing to it at all.  I brought the mechanic out for a ride, bc they state they can't reproduce the issue. 
      Took the guy out on I-95 and punched it.. ( frustration ) , within a second, the steering wheel was all over the place. The mechanics reaction was to say that was normal....
        I called my fleet mechanic, said he knows what the issue is , and will order the new gearbox .... If GM knows of this issue, Why are dealerships so difficult to get to do the work?
         ( Delray Buick Gmc )
    • By Gorehamj
      John Goreham
      Contributing Writer, GM-Trucks.com
      9-11-2019
       
      General Motors has announced that NHTSA is mandating a safety recall for the following vehicles:
      2014-2018 Chevrolet Silverado and GMC Sierra Pickups (1500 / 2500 / 3500) 2015-2018 Chevrolet Suburban, Tahoe, GMC Yukon vehicles  2015-2017 Cadillac Escalade  
      NHTSA reports that the amount of vacuum created by the vacuum pump may decrease over time. The group says that as the vacuum level drops, the brake assist decreases, and that this increasing braking effort, extending the distance required to stop the vehicle, thereby increasing the risk of a crash. This new recall covers 3.4 million vehicles. 
       
      The Problem: The brake pump uses engine oil to lubricate itself. If the pump becomes clogged with engine oil sludge the units ability to create vaccum is diminished over time. As a result, braking force and ability also drops. The issue is usually accompanied by a "Service Brake Assist" warning message in the dash. 
       
      The Fix: GM will reprogram the computer that controls the secondary brake assist pump. The secondary pump will now activate at lower speeds and different situations quicker to compensate for any lost output from the main pump. Since the pumps are not failing, GM has decided not to replace them.
       
      GM's number for this recall is N192268490. In compliance with federal law, GM will notify owners, typically by snail mail. GM says that its dealers will reprogram the Electronic Brake Control Module. However, GM has not yet provided a notification schedule. Owners may contact Chevrolet customer service at 1-800-630-2438, Cadillac customer service at 1-800-458-8006 or GMC customer service at 1-800-462-8782.
       
      If you own one of these vehicles and wish to check to see if your vehicle is included (or not) you can do so at this link immediately.
       
      As with every safety recall, customers will not be charged by GM for the needed repairs or modifications. 
       
      NHTSA's public information on this issue indicates that many accidents have been reported to NHTSA including some with injuries. This recall is the result of a NHTSA investigation that lasted nearly a year. In its investigation report, NHTSA noted the following details about the problem:
       
       
    • By David Acosta
      Theft deterrant light comes on, airbag light comes on, and speed odometer going crazy. All of my gauges basically go crazy on my cluster after 2 minutes of driving. I want to say its the body control module but I also think its the HMI. I need help with this issue. Do i order a new BCM and have it snet in to get programmed to my VIN or take it to the dealer and 
  • Recently Browsing   0 members

    No registered users viewing this page.

  • Forum Statistics

    210,752
    Total Topics
    2,259,413
    Total Posts
  • Member Statistics

    181,820
    Total Members
    8,960
    Most Online
    Nevets80
    Newest Member
    Nevets80
    Joined
  • Who's Online   66 Members, 0 Anonymous, 1,526 Guests (See full list)

×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.