P1682 on RAM
Ignition 1 Switch Circuit 2
P1682 on RAM vehicles indicates ignition 1 switch circuit 2. Au7o has documented this code across 1 RAM model — most commonly on 1500. 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. Typical repair costs on RAM range from $100 to $400, depending on the specific model and root cause.
Common Causes of P1682
- •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)
P1682 on RAM by Model
RAM 1500(1 issue)
- Sentry Key Immobilizer (SKIM/WCM) No-Start — Security Light On, Cranks But Won't Run1998-2010
Rams with the Sentry Key Immobilizer Module (SKIM/WCM) can lock out the fuel injectors if the module fails to read a valid transponder key. The engine cranks, fires for ~2 seconds, then dies, and the security/theft light stays on or blinks. Causes include a failing SKIM/WCM, a damaged antenna ring around the ignition lock, a worn transponder chip in the key, or wiring/connector corrosion.
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View P1682 across all makes →Frequently Asked Questions
What does P1682 mean on RAM?▼
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. On RAM specifically, this code is documented across 1 model.
What causes P1682 on RAM vehicles?▼
Common causes on RAM: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P1682 on a RAM?▼
Repair costs on RAM range from $100 to $400, depending on the specific model and root cause.
Which RAM models have P1682 documented?▼
Au7o has documented P1682 on 1 RAM model: 1500.