Q: dtc P1682,no crank no start.

asked by on February 19, 2017

Vehicle in question was about to be sold.as instructed a complete fluid check was done,upon finishing fluid check;it was also stated that a Tracker needed to be installed on the vehicle as well. Now here's the problem.the trackers require a constant 12 volt power supply as well as a ground.so with a power probe tester,a constant power wire was located. The group of wires looked to be the main ones along the column. Not sure what happened, but when the tracker was hooked up to the positive power wire then the ground was hooked up the horn went off. Not sure exactly what component the positive went to,but now there's a p1682 trouble code and a no start no crank issue. Any help or advice would be greatly appreciated.

My car has 128000 miles.
My car has an automatic transmission.

Hi there. The code you are getting P1682 is due to the ECM seeing a difference in the voltage levels of the two main power inputs to the ECM and will store the code when one voltage is different than the other one. You should have the power relay and start power relays replaced before anything else. The wiring on these vehicles are also known to get intermittent contact due to corrosion. There are a few things you can do to resolve this issue. Try disconnecting the battery and disconnecting the ECM connectors and adding small amounts of dielectric lube to the pins and socket and reinstall the connection. Then have the vehicle battery reconnected and try to start the vehicle. If it still will not start, then you will need to have the complete pinpoint test for code P1682 done to isolate the problem.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

What others are asking

Filling up at the gas station.

The issue is the purge vent hose on the fuel filler neck is either leaking or it is plugged up causing the fuel system to vapor lock making the fuel not flow into the fuel tank properly. Check the hose...

If my check engine light comes on, does it limit my cars power. My codes says it’s my fuel pressure regulator

There are hundreds of individual OBD-II trouble codes any one of which can cause illumination of the check engine light. The vast majority of the codes do not reflect, or refer to, conditions that cause marked loss of vehicle power....

Transmission problem - electrical problem. 2011 silverado 5.3l

Those are pretty serious codes referring to communications failures between control modules as well as potential failure of the PCM itself. Most electrical failures are wiring related (corrosion, bad grounds, wire break, etc.) and diagnosing this will proceed with those...

Transmission not shifting properly

What you are describing is often a sign of low transmission fluid or a faulty transmission control solenoid. As you know, automatic transmissions use pressurized hydraulic fluid to change gears. Every time a gear change is required, the car's computer...

Right Blinker not working

If one bulb does not light up, the blinker will not blink as fast as it did or it will not blink at all, then turn on the left blinker to see all the bulbs that light up and then...

Key won't program

Greetings! Your truck is considerably new, therefore the key, ignition, and the immobilizer system will have to be reprogrammed by the special equipment that is only available at the dealership, or by a licensed locksmith.

abs light comes on after brakes were fixed

While it may be possible abs sensors were damaged while the brakes were replaced, without being able to see them to inspect for physical damage, it would be impossible to say yes, they were damaged during other repairs. ABS sensors...

VDC, Slip, service and car take a couple seconds to start.

Hi there. Check the master cylinder reservoir and see if the fluid is low. Low fluid in the brake system will cause the slip light to come on with the VCD light. Also, check the condition of the car battery...

Car stalling going up incline

It sounds like this may be related to a faulty throttle position sensor or potentially a dirty or failing mass air flow sensor. The mass air flow sensor monitors air intake as it is mixed with fuel prior to being...

Related articles

A Buyer’s Guide to the 2012 Buick LaCrosse eAssist
Buick Buick has entered the hybrid market in a big way with the 2012 Buick LaCrosse eAssist model. It has all of the same great looks and features that you would expect from a luxury sedan from Buick. However, the...
A Buyer's Guide to the 2012 Buick Regal eAssist
Although Although a lot changed about the Buick Regal in 2012, the addition of a hybrid model was definitely the biggest head turner. Whether you want to do your part for the environment or simply save at the pump, this...
Understanding the Buick Oil Life System and Service Indicator Lights
Car symbols, or dashboard lights, are a car service reminder. The Buick Oil Life System indicates when and what service your car needs.