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Changed starter, battery is good, all fuses good and still…

Customer Question
Hi. Changed starter, battery...

Hi. Changed starter, battery is good, all fuses good and still the car won't start

Mechanic's Assistant: Have you changed a battery before?

Only thing odd is the dashboard message "service theft deterrent system" warning light No, but tested the battery and it is ok

Mechanic's Assistant: What is the model/year of your Chevy?

2012 Silverado 1500

Mechanic's Assistant: Are you fixing your Silverado 1500 yourself? What have you tried so far?

All of what I mentioned above

Submitted: 5 months ago.Category: Chevy
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Customer reply replied 5 months ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call.
Customer reply replied 5 months ago
Let me know if you need more information, or send me the service offer(s) so we can proceed.
Answered in 5 minutes by:
3/9/2018
Chevy Mechanic: Canuck Tech, Auto Mechanic replied 5 months ago
Canuck Tech
Canuck Tech, Auto Mechanic
Category: Chevy
Satisfied Customers: 704
Experience: 20 years experience in tune up, electrical and general repair
Verified

Hi there - I'm going to do some quick research for you. Can you wait for a couple of moments?

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Customer reply replied 5 months ago
Absolutely!
Chevy Mechanic: Canuck Tech, Auto Mechanic replied 5 months ago

which engine?

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Customer reply replied 5 months ago
4.3
Chevy Mechanic: Canuck Tech, Auto Mechanic replied 5 months ago

Don't take offense, but I think the faithful Chevy thinks you are trying to steal it...

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Customer reply replied 5 months ago
None taken.
Customer reply replied 5 months ago
How can we get the issue resolved?
Chevy Mechanic: Canuck Tech, Auto Mechanic replied 5 months ago

Is this your vehicle, or are you a tech?

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Customer reply replied 5 months ago
Tech
Chevy Mechanic: Canuck Tech, Auto Mechanic replied 5 months ago

Do you have a scanner that can get into the body controller?

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Customer reply replied 5 months ago
Snapon Verus
Chevy Mechanic: Canuck Tech, Auto Mechanic replied 5 months ago

Also, has a new key been cut recently, or was the lock cylinder changed? Did the customer supply all the keys?

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Customer reply replied 5 months ago
Customer supplied 1 key only
No answer to the other questions, not sure what they did
Chevy Mechanic: Canuck Tech, Auto Mechanic replied 5 months ago

I think this truck has an immobilizer, so if the key has been changed, and not programmed, it won't start. I've run into this enough times that it is one of my first questions. You may want to touch base with the customer sooner than later, to see what lead up to the no start...

Have you scanned all the modules for codes? I think the verus will do that - ECM, BCM, TDM, etc

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Customer reply replied 5 months ago
Running the scanner now
Not sure I'll get answers from the driver, this is a fleet car for a construction company, could be driven by a bunch of people.
Chevy Mechanic: Canuck Tech, Auto Mechanic replied 5 months ago

Hmmm. OK. See what codes come up first...

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Customer reply replied 5 months ago
P1682
Chevy Mechanic: Canuck Tech, Auto Mechanic replied 5 months ago

DTC P1632
- Theft Deterrent Fuel Disable Signal Received

I'm assuming it was a 1632 - no P01682...

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Chevy Mechanic: Canuck Tech, Auto Mechanic replied 5 months ago

I'd ask the company if they have any more keys before I went too much deeper... gotta rule that out first

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Customer reply replied 5 months ago
We've asked them if they gave us the right key, to which they said "yes". Let me ask them if the key was changed recently.
Chevy Mechanic: Canuck Tech, Auto Mechanic replied 5 months ago

I would ask for all the keys... people don't understand how this system works...

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Chevy Mechanic: Canuck Tech, Auto Mechanic replied 5 months ago

It is an RFID system, like putting a chip in the cat or dog... The security system has to see the right answer from the chip in the key, otherwise, the secret handshake doesn't happen, and the vehicle won't run...

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Customer reply replied 5 months ago
To make matters worse, we have a bit of a language barrier
Customer reply replied 5 months ago
The code is P1682 though, any idea there?
Chevy Mechanic: Canuck Tech, Auto Mechanic replied 5 months ago

1682 doesn't show up on mu list for a 2012 chevy pick up with a 4.3, 2WD... do I have it all correct? I can acces other resources...

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Chevy Mechanic: Canuck Tech, Auto Mechanic replied 5 months ago

https://www.autocodes.com/p1682_chevrolet.html

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Customer reply replied 5 months ago
That's correct.
Customer reply replied 5 months ago
Please do look elsewhere, need to keep this account.
Chevy Mechanic: Canuck Tech, Auto Mechanic replied 5 months ago

No problem. We'll figure it out.

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Chevy Mechanic: Canuck Tech, Auto Mechanic replied 5 months ago

Let's check a couple of fuses... I'll narrow that down...

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Chevy Mechanic: Canuck Tech, Auto Mechanic replied 5 months ago

underhood fuse block, fuse 35, 2 amp...

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Customer reply replied 5 months ago
Good.
Customer reply replied 5 months ago
Checked all the fuses earlier.
Customer reply replied 5 months ago
Checked and swapped relays as well
Customer reply replied 5 months ago
If they do bring the right key, how does one take it out of theft mode?
Chevy Mechanic: Canuck Tech, Auto Mechanic replied 5 months ago

Sometimes it is just a waiting game - like 30 minutes to reset it, or you could disconnect the battery...

I'm looking for more fuses to check, and it could be an ignition switch issue too, especially if this rig has big miles, but I'm not ready to condemn any components yet

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Customer reply replied 5 months ago
Only 79k
Chevy Mechanic: Canuck Tech, Auto Mechanic replied 5 months ago

ok - I'm still seeking fuses, but this cam across my radar too -

Condition/Concern

A customer may comment on any of the following complaints:

  • Intermittent no crank
  • Intermittent no start, or start and stall
  • Security / Theft light / Message
  • Poor or no RKE range
  • Keyless or passive entry/start inoperative
  • No Fob Detected message
  • Service Tire Pressure Monitor message
  • Any of the following DTC's: B3055, B3060, B3935, C0750, C0755, C0760, C0765, and/or C0775.

Note: On vehicles equipped with keyless/passive start, the vehicle will start if the fob is placed in the fob pocket.

In most cases, these concerns cannot be duplicated.

The above systems use Radio Frequency (RF) to transmit information. Some aftermarket devices cause Radio Frequency Interference (RFI), which can "jam" the radio frequency being transmitted.

Listed below are a number of aftermarket devices that can cause RFI. In many cases, these types of devices will be attached to the customer's key ring and could be removed from the key ring or from inside the vehicle when the customer drops the vehicle off for service.

  • Vehicle immobilizer keys from other vehicles
  • Keyless access transmitters from other vehicles
  • Interstate/bridge toll passes
  • Gate/door passes to allow access to pools, driveways, entry doors, etc.
  • Community/parking access cards
  • Fuel station speed passes
  • Building access swipe cards/ transponder devices
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Customer reply replied 5 months ago
At this point we do think it's the key as well, but won't know for certain until they bring another one.
Customer reply replied 5 months ago
Someone came by, hopefully they'll find the right key if indeed that is the issue. Fingers crossed.
Chevy Mechanic: Canuck Tech, Auto Mechanic replied 5 months ago

OK. Do you want me to call off the fuse search for the moment? I just wanted to chase after that rogue code...

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Customer reply replied 5 months ago
See what you find.
Chevy Mechanic: Canuck Tech, Auto Mechanic replied 5 months ago

OK - I'll be back before too long...

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Customer reply replied 5 months ago
Never mind, it was the wrong key. They just brought another one and it seems to work.
Chevy Mechanic: Canuck Tech, Auto Mechanic replied 5 months ago

Customers, man... we love them...

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Chevy Mechanic: Canuck Tech, Auto Mechanic replied 5 months ago

If you have been satisfied with my service, please close the question, and rate my service. Thanks. Canuck

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