Police Response Codes Explained: Code 1, Code 2, Code 3, and Code 4

Most police codes describe what is happening. A response code describes how fast the officer is getting there. That is a different job, and it explains why the lowest numbers in the system get used all day while many other codes sit untouched for weeks.

The short version: Code 1 is routine, Code 2 is urgent, Code 3 is an emergency with lights and siren, and Code 4 means no more help is needed. Those four meanings hold in a large share of American agencies, especially on the West Coast, where the system took shape. They are not a national standard, though, and the details shift from one department to the next. This guide covers what each code means, how a call moves from one to another, and where the local differences tend to hide.

What a Response Code Actually Is

A response code is a speed-and-urgency instruction. When a dispatcher sends a unit to a call, the code tells the officer how to travel there. It answers a narrow question: do I drive normally, drive faster, or run lights and siren?

That makes response codes different from the codes most people think of first. A ten-code such as 10-4 is a status or message. A penal code such as 187 names a crime. A response code names a driving posture. If you want the wider map of how these families fit together, the difference between 10-codes, 11-codes and penal codes is worth reading alongside this one, and our overview of emergency response codes in the United States shows how the same idea appears across agencies.

The numbered response codes are most closely tied to California departments, including the LAPD and the California Highway Patrol, and spread outward from there. You will hear them on scanners across the western states and in plenty of places that never had any California connection. Plenty of other agencies skip the numbers entirely and say “routine,” “priority” or “emergency” in plain English. Both approaches carry the same information.

Code 1: Routine Response

Code 1 is the baseline. The officer responds at normal speed, obeys every traffic law, and uses no lights or siren. In many agencies it also carries a “when convenient” flavour: the call matters, but nothing about it is time-sensitive.

Typical Code 1 calls look like this:

• A report of a theft that happened hours ago
• A noise complaint with no threat attached
• A request to meet a citizen about a past incident
• A parking or abandoned-vehicle complaint
• A follow-up visit to take a statement

Code 1 is not “ignore this.” Officers still go, and a Code 1 call can be upgraded the moment new information comes in. A dispatcher who learns that the “routine” noise complaint now involves a man with a bat will change the code, and the unit will change how it drives.

One regional wrinkle: some agencies use Code 1 to mean “respond when you can, no hurry,” while others treat it as “respond now, but normally.” The practical difference is small, but it is a good example of why local meaning matters.

Code 2: Urgent, No Lights or Siren

Code 2 sits in the middle. The call is urgent, so the officer should get there promptly, but the situation does not justify the risk of lights-and-siren driving. The officer moves faster than a Code 1 response, still within the traffic laws.

Code 2 fits calls where a person may need help soon but nobody is in immediate danger:

• A report of a suspicious person who is still nearby
• A prowler call where the caller is safe inside
• A disturbance that could escalate but hasn’t yet
• A minor injury accident with no one trapped

The most common point of confusion is whether Code 2 allows emergency lights. In many departments the answer is no: lights and siren belong to Code 3. In others, Code 2 allows lights without the siren, so the officer can move through traffic more easily while staying quiet near the scene. When a scanner listener hears “Code 2,” the safest reading is “hurry, but this is not the full emergency response.”

There is a tactical reason for the quiet approach. A siren announces the arrival of police to everyone within several blocks, including a suspect who is still on scene. For a burglary-in-progress call, officers sometimes choose a faster-than-normal but silent approach on purpose. The dispatcher or the officer might request that the response stay quiet, which is sometimes described as running “Code 2” or “no siren” to protect the element of surprise.

Code 3: Emergency Response, Lights and Siren

Code 3 is the code people know. It means an emergency response with red-and-blue lights and siren active, and it authorises the officer to move through traffic in ways ordinary drivers cannot, such as passing through a red light after slowing and checking that it is safe.

The authority has limits. In most states the law gives emergency vehicles specific exemptions, often tied to using both lights and siren, and it also requires “due regard” for the safety of everyone else on the road. An officer running Code 3 is not above traffic law. The exemption comes with a duty, and departments write policy to enforce it. Many of them restrict how fast an officer may go, require a stop or a slowdown at intersections, and make clear that a collision caused by reckless driving is the officer’s responsibility.

Code 3 calls include:

• An officer needs help
• A shooting, stabbing or other violent crime in progress
• A robbery or burglary with a suspect on scene
• A serious injury collision
• A medical emergency where police arrive before the ambulance

Dispatch often controls how many units go Code 3. If six cars are nearby and the call needs two, the dispatcher sends two Code 3 and the rest Code 2, or cancels them altogether. That is deliberate. Every unit racing to the same scene adds risk on the road without adding much on arrival. When you hear a dispatcher say “units responding Code 2, one unit Code 3,” that is this principle at work.

Fire and EMS crews borrow the same word. An ambulance running “Code 3” is using lights and siren, which is why you will hear the phrase on fire and medical channels as well as police ones. Our dedicated explainer on emergency response codes covers that overlap.

Code 4: No Further Assistance Needed

Code 4 breaks the pattern. Codes 1 through 3 describe how to get to a call. Code 4 describes the state of the call once an officer is there: the situation is under control and no more units are needed.

In practice, Code 4 is what an officer says after arriving at a Code 3 call and finding that the scene is safe. It cancels the backup. Cars still heading to the scene slow down and turn around, and the dispatcher stops waiting for updates. Our guide to what Code 4 means on the police radio goes into the history and the common uses in more depth.

The code has an important variant. Code 4 Adam (the “Adam” comes from an older phonetic alphabet) means the scene is under control, but a suspect remains at large. That is a very different message from plain Code 4. It tells every unit that help isn’t needed at this location while the search for someone nearby continues. Dispatchers and officers also use Code 4 as a quick welfare check: “Are you Code 4?” asks whether the officer is safe and doesn’t need help. A plain “Code 4” in reply means yes.

How One Call Moves Through the Codes

The codes make the most sense as a sequence. Here is a made-up but realistic call, written the way it might sound on a West Coast channel:

1. Dispatch: “Unit 12-Adam-7, report of a disturbance at the apartment complex on Maple, Code 2.” The call sounds urgent but not deadly, so the unit goes faster than normal, quietly.
2. Update: “Caller now reports the man has a knife. Upgrading to Code 3.” The code changes because the facts did. Lights and siren come on.
3. Backup: The dispatcher sends two more cars Code 3 and holds the others.
4. Arrival: The first officer arrives, assesses, and says nothing for a moment while taking cover.
5. Resolution: “Show me Code 4, one in custody.” The scene is safe, the backup cancels, and the units that were still en route turn back.
6. Follow-up: The officer writes the report. A call that began as Code 2 and spiked to Code 3 ends quietly at Code 4.

That arc, from a measured start to an emergency spike and back down to calm, is the usual rhythm of a serious call. Notice that the code changed during the call. Response codes are not fixed labels attached to a type of incident. They follow the facts as they develop.

Who Decides the Response Code

Usually the dispatcher makes the first call, based on what the caller reports and the agency’s priority rules. Many centres rank incidents by priority level, such as Priority 1 for life-threatening, Priority 2 for urgent and Priority 3 for routine, and then map those priorities onto response codes.

The officer can adjust. An officer who sees a call is more serious than reported can go Code 3 on their own judgement and tell dispatch. An officer who sees it is less serious can downgrade the response and say so. Supervisors can also change a response, particularly after an incident that went badly. Agencies tend to tighten their Code 3 rules after high-profile collisions, which is one reason policies differ so much between departments.

Why the Meaning Changes From Agency to Agency

Response codes look simple, which makes the variation easy to miss. A few of the common differences:

There is no federal authority that sets these, and the United States has roughly 18,000 separate law enforcement agencies. Each one writes its own policy. Some use Code 1 through Code 4 exactly as above. Others drop Code 1 and Code 2 and just use “routine” and “emergency.” A few reverse the order of the lower numbers. After the communication failures that followed Hurricane Katrina in 2005, federal guidance pushed agencies toward plain language, and many departments now say “emergency response” instead of “Code 3” when they work across agencies.

If you want to know what a code means in your area, check the local agency’s published list or a source that compares departments side by side. Our list of police codes is a good place to begin, and the guide to reading police scanner codes explains how to match what you hear to the right system.

Codes 5, 6 and 7: The Rest of the Family

The same numbered system continues past 4, though these codes are about activity rather than speed:

• Code 5: a stakeout or surveillance, where officers stay out of sight
• Code 6: out on a call or investigation; some agencies add Adam or Charles variants to show the level of backup needed
• Code 7: out of service for a meal break

Code 7 gets its own treatment in our guide to meal break codes, because it is one of the few codes that regular listeners hear many times a shift.

Response Codes and the Other Code Families

It helps to keep the families separate in your head. A single radio call can use several at once:

• A 10-code might acknowledge or give a status, like 10-4 (see why police say 10-4).
• A penal code might name the offence, as with the numbers covered in our California penal codes guide.
• A response code might say how fast to move.

A dispatcher on a busy channel could easily send one unit to a “211 in progress, Code 3,” which combines an offence and a response in a single sentence. Once you can pull those layers apart, scanner traffic gets much easier to follow. For the basics of the ten-code layer, start with police 10 codes: the full list and what each one means, and for 11-codes see the police radio 11-codes guide.

If you are following a specific department, its own page will tell you more than any general list. The Los Angeles Police Department codes are a good example of how a large agency layers response codes on top of its other systems, and the Florida police codes and signals show the opposite approach: a signal-based system in which “Signal 20” often does the job that Code 4 does elsewhere.

Outside the United States

Numbered response codes are mostly an American habit. In the United Kingdom, police forces use plain language and graded response categories instead, with calls typically classed as immediate, priority or routine, and the terms vary by force. If you came here from a British scanner or drama and wondered why nobody says “Code 3,” that is why. Our UK police code list explains the grading and the status codes British forces do use.

Tips for Listening

• Listen for the change, not just the code. An upgrade from Code 2 to Code 3 tells you the call just got worse.
• Treat Code 4 as the end of the emergency. Backup stands down and the tone of the channel softens.
• Watch for “Adam.” Code 4 Adam means control of the scene, not the end of the search.
• Don’t assume Code 2 means silent. Some departments allow lights at Code 2.
• Check your local list. A code that is standard in one county may be ignored in the next.

Using Police Code to Explore Further

Police Code is a free, ad-free police code explorer that puts these systems in one place. You can look up a response code, see how the meaning shifts between agencies and countries, and move from there into the ten-codes, penal codes and signals that sit around it. If you want to see how the American picture fits together, start with the US police code list or the complete list of police codes.

Response codes reward a small amount of study. Four numbers cover the whole arc of a call, from a routine drive across town to an emergency run and the quiet “Code 4” at the end. Learn that arc, check how your local agency tweaks it, and a large part of what you hear on a police scanner starts to make sense.