OBD-II Code P0215 — What It Means & How to Fix It

What Does This Error Mean?

P0215 means the ECM has detected a fault in the engine shutoff solenoid circuit. The engine shutoff solenoid (also called a fuel shutoff solenoid) cuts fuel to the engine when you turn the key off. If this solenoid or its circuit fails, the engine may not shut off when you turn the key — a condition called dieseling or engine run-on. In rare cases, it can also prevent the engine from starting at all. This is a safety-related code that should be addressed promptly.

Affected Models

Diesel-powered vehicles (common)
Older gasoline vehicles with carburetors and shutoff solenoids
Some Ford and GM diesel trucks
Older European diesel cars
Some industrial and agricultural vehicles

Common Causes

Engine shutoff solenoid has burned out internally and cannot open or close
Wiring to the shutoff solenoid is broken, shorted, or corroded
Fuse for the shutoff solenoid circuit has blown
Shutoff solenoid relay has failed and is not sending power to the solenoid
ECM output circuit for the shutoff solenoid has an internal fault

How to Fix It

Check the fuse for the engine shutoff solenoid circuit. Look in your fuse box diagram for a fuel solenoid or engine shutoff fuse. Replace a blown fuse with the correct amperage rating.

A blown fuse is the cheapest and easiest fix — always start here.
Locate the shutoff solenoid on your engine. On diesel engines, it is typically on the injection pump. On older gas engines, it may be on the carburetor. Inspect the connector and wiring.

On carbureted engines, the solenoid screws into the side of the carburetor float bowl — look for a small cylinder with a single wire.
Test the solenoid with a 12-volt test light or multimeter. Apply 12 volts directly to the solenoid terminals and listen for a click indicating it is working.

If the solenoid clicks when you apply power directly but not when connected to the vehicle, the problem is in the wiring or relay.
Inspect the shutoff solenoid relay if one is used. Test it with a multimeter or swap it with an identical relay from your fuse box to see if the problem resolves.

Many fuse boxes have multiple identical relays — swapping is a quick test if the relay is the same type.
If the solenoid, fuse, relay, and wiring are all good, the ECM output circuit may be at fault. Have a professional test the ECM before replacing it — ECMs are expensive.

Always confirm ECM failure with proper testing equipment rather than assumption.

When to Call a Professional

An engine that will not shut off is a genuine safety hazard — do not ignore this code. If your engine keeps running after you remove the key, do not park it in a closed garage. A mechanic can quickly test the solenoid circuit with a simple 12-volt test light. For diesel vehicles, this solenoid is critical — have it inspected immediately.

Frequently Asked Questions

Why does my engine keep running after I turn off the key?

This condition is called engine run-on or dieseling. It happens when the engine continues to receive fuel after the ignition is shut off. A failed shutoff solenoid is one common cause — it should be cutting the fuel supply but is not. Another cause is carbon buildup in the combustion chamber, which can ignite fuel without a spark.

Is P0215 dangerous?

It can be. An engine that will not shut off is a fire risk and a safety hazard. If your engine does not stop when you remove the key, do not park it in an enclosed space. Get the shutoff solenoid circuit repaired as soon as possible. This is one of those codes you should not ignore or drive with for long.

How much does a shutoff solenoid cost to replace?

Shutoff solenoids are typically inexpensive — $15 to $60 for the part on most vehicles. Labor is usually minimal since they are easy to access. The total repair is often well under $150 at a shop. This makes P0215 one of the more affordable safety repairs you can make.