OBD-II Code P1682 — What It Means & How to Fix It

What Does This Error Mean?

P1682 is a Chrysler, Dodge, and Jeep-specific code. It means the ignition switch output circuit is not working as expected by the PCM. The PCM monitors voltage on the ignition switch circuit. When that voltage is absent or abnormal while the switch is in the run or start position, P1682 is set. This can lead to intermittent stalling, no-start conditions, or modules not powering up correctly.

Affected Models

Common in Dodge Ram 1500, 2500, and 3500
Common in Jeep Grand Cherokee and Wrangler
Common in Chrysler 300 and Dodge Charger
Seen in Dodge Durango and Jeep Commander

Common Causes

Faulty ignition switch — contact wear or internal failure causing intermittent voltage loss
Blown fuse in the ignition switch output circuit
Damaged or chafed wiring between the ignition switch and the PCM
Faulty PCM power relay (also called the ASD relay on Chrysler products)
Poor ground connection at the PCM or body ground

How to Fix It

Check all fuses related to the ignition system in both the under-hood PDC (Power Distribution Center) and the interior fuse panel.

A blown fuse is the fastest and cheapest thing to check first.
Locate and test the ASD (Automatic Shutdown) relay in the under-hood fuse box. Swap it with an identical relay nearby to test.

The ASD relay controls power to the PCM and fuel system on Chrysler products and is a common failure point.
Inspect the ignition switch connector and wiring harness at the steering column for corrosion or broken wires.

Chrysler ignition switch wiring can chafe against the steering column on high-mileage vehicles.
Test the ignition switch output voltage with a multimeter while the key is in the RUN position.

You should see battery voltage (12+ volts) on the ignition switch output wire. No voltage confirms a bad switch or upstream fault.
If all components test good, inspect PCM ground connections and have the PCM tested for internal faults.

A failing PCM on Chrysler products is less common but does occur — confirm all external causes before replacing it.

When to Call a Professional

Ignition switch replacement is $50 to $150 in parts plus one to two hours of labor. ASD relay replacement is $15 to $30 and is a DIY-friendly repair. Wiring repair cost varies depending on damage location. PCM replacement is $200 to $600 for Chrysler products.

Frequently Asked Questions

Can P1682 cause my Dodge or Jeep to stall?

Yes — if the ignition switch circuit loses voltage intermittently, the PCM may shut down fuel and ignition. This causes sudden stalling, especially at low speeds or when the steering column is bumped. It can be a safety hazard if it happens while driving.

What is the ASD relay and where is it?

ASD stands for Automatic Shutdown relay. It controls power to the fuel injectors, fuel pump, ignition coils, and PCM on Chrysler products. It is located in the under-hood Power Distribution Center (PDC) — a black fuse/relay box near the battery. The lid usually has a diagram showing which relay is which.

Is P1682 expensive to fix?

Not usually. Most P1682 cases are fixed by replacing a relay ($15 to $30) or the ignition switch ($100 to $200 total). Wiring repair can add cost if the harness is damaged. PCM replacement is the expensive worst-case scenario.