P1682 on 1998-2010 RAM 1500 — Ignition 1 Switch Circuit 2
1 vehicles · 1 makes · $100-$400 repair
Most Reported On
P1682 is an OBD-II diagnostic trouble code meaning “Ignition 1 Switch Circuit 2.” A manufacturer-specific code used primarily by GM (Chevrolet, GMC, Buick, Cadillac), also listed in GM service data as "Driver 5 Line 2." The engine control module is fed by two separate ignition 1 voltage circuits - one from the ignition switch and one from the run/crank or powertrain relay through a fuse - and P1682 sets when the voltage difference between them exceeds the allowed limit. Because those feeds power the throttle actuator control circuits, this code often accompanies reduced-power mode, a crank-no-start, a no-crank condition, or a stall. This code is most commonly reported on 1998-2010 RAM 1500, with repair costs ranging from $100 to $400.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
P1682 does not use the standard P/B/C/U prefix. It may be a manufacturer-specific code, so verify that a scanner supports your exact year, model and module before buying.
FAQ
What does P1682 mean?
P1682 stands for "Ignition 1 Switch Circuit 2." A manufacturer-specific code used primarily by GM (Chevrolet, GMC, Buick, Cadillac), also listed in GM service data as "Driver 5 Line 2." The engine control module is fed by two separate ignition 1 voltage circuits - one from the ignition switch and one from the run/crank or powertrain relay through a fuse - and P1682 sets when the voltage difference between them exceeds the allowed limit. Because those feeds power the throttle actuator control circuits, this code often accompanies reduced-power mode, a crank-no-start, a no-crank condition, or a stall.
What are the most common causes of P1682?
The most common causes of P1682 are: Failed underhood fuse block / relay center (a very commonly reported cause), Worn or failing ignition switch, Blown fuse or failed run/crank or powertrain relay, Corroded, loose, or damaged ignition-feed connectors, Open or high-resistance wiring in either ignition 1 circuit, Poor ECM ground or corroded ground strap, Faulty engine control module (diagnose last). The specific cause varies by vehicle.
How much does it cost to fix P1682?
Repair costs for P1682 range from $100 to $400, depending on the vehicle and root cause.
Which vehicles are affected by P1682?
Au7o has documented P1682 across 1 vehicle models from 1 manufacturers: RAM.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.