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hi all, so im in the midst of loosing my mind. i have a 2009 saturn aura xe. 4 door sedan. 2.4 liter. when driving sudden the car goes into idle really hard, check engine light comes on , and the code is P1682 driver 5 line 2. i have scourged the internet for fixes. i have replaced and checked numerous fuses, relays, even i have replaced the intake and exhaust varible timeing valves, pvc valve, ive had the ignition switch checked, checked for a bad wiring, ive even gone as far as replacing the computer, and i cannot for the life of me figure this out. i cant even find a how to replace and remove the fuse box in the engine compartment theres nothing availble, my local mechanic has had the car almost 2 weeks. so im at my wits end. should i just scrap the car and be done with it? or is there another way? any help would be greatly appreciated.
The information below is from an internet search on this code for your vehicle. I have not personally encountered this code. There may be an accuracies in the information, but this is my best shot. Hopefully others will chime in.
On GM vehicles, the code P1682 is defined as “Driver 5 Line 2.”
Per the following diagram, there are multiple ignition feeds leading to different parts of the ECM. These allow different circuits to power different parts of the vehicle independently..
The code is set when the vehicle’s computer detects that the voltage difference between circuit 1 and circuit 2 is higher than the maximum threshold set by GM, often triggering "reduced power" (limp) mode, especially when warm.
I'm assuming one circuit is the ignition switch circuit, and the other circuit is the one going through the powertrain relay. The latter splits into multiple pathways and feeds the ignition voltage to multiple inputs on the ECM.
Possible causes for the voltages to be different include:
I would think the first order of business would be to measure the voltage at each of the ignition inputs on the ECM at their respective terminals.
Under hood fuse box issues and defective ignition switches have been listed in several places on the net as the most likely culprits.
Here is the pertinent electrical schematic:
Here is the link to the page containing this and other related engine wiring diagrams:
Also from that charm.li manual is a description and troubleshooting steps for the P1682 code. The ECM apparently compares voltage received from the powertrain relay and the RUN/CRANK relay, and if the variance is more than 3 volts for more than 2 seconds, it sets this code. Those relays are shown in the schematic Derf provided. I'm attaching a link to this page of the manual.
With The General’s ignition switch failure history, I would look there again. I would probably replace both the switch and the pigtail for the switch. With both of these components readily available I bet your car is not the only one having these issues.
The information below is from an internet search on this code for your vehicle. I have not personally encountered this code. There may be an accuracies in the information, but this is my best shot. Hopefully others will chime in.
On GM vehicles, the code P1682 is defined as “Driver 5 Line 2.”
Per the following diagram, there are multiple ignition feeds leading to different parts of the ECM. These allow different circuits to power different parts of the vehicle independently..
The code is set when the vehicle’s computer detects that the voltage difference between circuit 1 and circuit 2 is higher than the maximum threshold set by GM, often triggering "reduced power" (limp) mode, especially when warm.
I'm assuming one circuit is the ignition switch circuit, and the other circuit is the one going through the powertrain relay. The latter splits into multiple pathways and feeds the ignition voltage to multiple inputs on the ECM.
Possible causes for the voltages to be different include:
I would think the first order of business would be to measure the voltage at each of the ignition inputs on the ECM at their respective terminals.
Under hood fuse box issues and defective ignition switches have been listed in several places on the net as the most likely culprits.
Here is the pertinent electrical schematic:
Here is the link to the page containing this and other related engine wiring diagrams:
do u know where this specific relay would be? ive checked all the relays in the engine compartment, both resistance test and click test, resistance was measuring about 75-78 on all the relays, click test responded well to each one of them, ived replaced all the fuses, and 30-60 amp fuses as well. tonight i just replaced the 2am fuse in the passenger side fuse box, they were all severally discolored. none of them blown but severally discolored.
engine power loss, code P1682
