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2008 chevy silverado 1500 5.3L J vin has code P1682. I have…

Customer Question
2008 chevy silverado 1500...

2008 chevy silverado 1500 5.3L J vin has code P1682

Mechanic's Assistant: Just to clarify, what's the exact code? And have you tried to reset it?

I have reset the check engine light and every time I try to start it will crank but not run Code is P1682

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

Yes I am and I've replace battery, ignition switch, checked all the fuses test good

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Not at this time no

Submitted: 7 months ago.Category: Chevy
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Answered in 3 minutes by:
9/30/2017
Chevy Mechanic: Dan, Technician replied 7 months ago
Dan
Dan, Technician
Category: Chevy
Satisfied Customers: 25,782
Experience: Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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Hello, my name is ***** ***** I'm here to help get your problem solved.

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Chevy Mechanic: Dan, Technician replied 7 months ago

Are any aftermarket accessories installed such as remote start or alarm?

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Customer reply replied 7 months ago
Remote start yes
Chevy Mechanic: Dan, Technician replied 7 months ago

Disconnect the remote start and let me know if that helps, it is common for aftermarket accessories to cause this code. Keep me updated, thanks.

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Customer reply replied 7 months ago
Wow that's what I always say at the shop and what do you know it was it
Chevy Mechanic: Dan, Technician replied 7 months ago

Good to hear, I'm happy to hear that took care of problems. Ignition circuits are pretty touchy on newer vehicles, thanks for update.

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Customer reply replied 7 months ago
Oh boy just shut off now have codes P1516,P1682, and P2101
Chevy Mechanic: Dan, Technician replied 7 months ago

The two new codes usually mean the throttle body assembly has failed, have you ever gotten these codes before?

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Customer reply replied 7 months ago
No
Chevy Mechanic: Dan, Technician replied 7 months ago

Reset them again to see if they come back. If so, clean ground 104 and if that doesn't help do a visual inspection of wiring/connector and replace throttle body. Ground is located On the left front corner of the engine. Keep me updated, thanks.

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Customer reply replied 7 months ago
Ok so back to code P1682 only and won't stay running
Chevy Mechanic: Dan, Technician replied 7 months ago

At the Black ECM connector, check for ignition power at pin 19 (Pink wire) and pin 47 (Pink/Black wire) with the ignition on, and no voltage there with the ignition off. Let me know, thanks.

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Customer reply replied 7 months ago
Ok pin 19 pink has 12v and 47 pin pink/black has only .82v with ignition on and no volts with ignition off
Customer reply replied 7 months ago
Also the dash says engine power is reduced
Chevy Mechanic: Dan, Technician replied 7 months ago

Pink/back get power from the ECM/Throt fuse under the hood. Check to see if fuse is good, if so check to see if fuse has power, if not replace the ECM/PCM relay. Let me know, thanks.

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Customer reply replied 7 months ago
Ok relay was bad replace now have 12v on the pink/black and still P1682 code crank no start also dash still reading engine power reduced
Chevy Mechanic: Dan, Technician replied 7 months ago

I'm assuming you have tried to erase codes?

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Customer reply replied 7 months ago
but after every startup or crank it still has code P1682 every time
Chevy Mechanic: Dan, Technician replied 7 months ago

Test voltage on the following fuses with the Key On Engine Off (KOEO): IGNE, ECM1, IGN0, ENG1. Let me know, thanks.

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Customer reply replied 7 months ago
I checked fuses 4 egn 15A .54v, 5 ecm/throt 15A has .61v, 12 ecm batt 10A 12v, 56 ecm-ign 15A has 12v, 19 trans ign1 15A 12v,
Chevy Mechanic: Dan, Technician replied 7 months ago

The ECM throt seems to be acting up again. Check to see if pin 87 of ECM relay has 12v, if so jump pin 87 to pin 30 and see if that sends 12v to fuse. If not fuse box needs to be replaced.

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Customer reply replied 7 months ago
Ok jumped 87 to 30 got 12V at the fuse truck started and ran no problem
Tested the relay intermittently fails
Chevy Mechanic: Dan, Technician replied 7 months ago

You have already replaced the relay?

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Chevy Mechanic: Dan, Technician replied 7 months ago

The PCM activates relay via yellow wire at pin 59 of PCM connector. These vehicle have a lot of problems with corrosion on PCM connectors so I'd start by cleaning PCM connector.

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Chevy Mechanic: Dan, Technician replied 7 months ago

Ever get it figured out? Please do not forget to rate answer. Thanks.

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