Service DEF System See Dealer [Meaning, Causes & Fix]

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The Ram diesel pickup trucks are known for their rugged powerfulness and durability.

However, successful my acquisition arsenic a mechanic, nan Cummins diesel models often person a pesky rumor , nan “Service DEF System See Dealer” informing popping up.

When connected to an OBD scanner, it shows problem codes for illustration P203E aliases P203F (Depending connected nan model).

This aforesaid DEF strategy problem besides affects Jeep models for illustration nan Wrangler, Gladiator, and Grand Cherokee equipped pinch Cummins diesels.

In this article, I’ll usage my expertise to explicate what nan “Service DEF System” connection really means, outline nan communal causes, and item really to hole them.

The culprits and solutions use to some Ram and Jeep vehicles pinch Cummins diesel engines.

Without wasting immoderate much time, Let’s get started!

What Does nan “Service DEF System See Dealer” Alert Mean?

In layman’s terms, DEF stands for Diesel Exhaust Fluid. The Diesel Exhaust Fluid System is simply a system designed to trim harmful emissions from your engine.

It does truthful by injecting a mini magnitude of DEF into nan exhaust stream, Which converts nitrogen oxides (NOx) into harmless nitrogen and h2o vapor.

When nan “Service DEF System See Dealer” connection comes up connected your dashboard, it intends nan conveyance has detected an rumor pinch nan DEF vessel aliases system.

This tin beryllium caused by a assortment of issues (covered successful item below)

Service DEF System See Dealer Causes:

1. Overfilled DEF Tank

The astir communal origin is overfilling nan DEF tank.

The vessel is designed pinch an aerial spread astatine nan apical for nan fluid level sensor to activity properly.

Overfilling of your Diesel Exhaust Fuel vessel tin create issues pinch nan DEF level sensor, a portion of tech introduced successful nan 2019 model.

An overfilled vessel intends there’s nary aerial abstraction for nan Ultrasonic Frequency (UF) awesome to bounce backmost to nan sensor.

In elemental terms? It’s for illustration trying to get a compartment telephone awesome successful a tunnel; it conscionable won’t work.

Here is an summation explaining soiled DEF injectors arsenic different imaginable cause:

2. Dirty DEF Injectors

The diesel exhaust fluid (DEF) strategy uses a typical injector to spray DEF into nan exhaust watercourse to trim emissions.

Over time, this injector tin get clogged pinch deposits and debris. This restricts DEF travel and hurts strategy performance.

Contaminants for illustration dirt, minerals, and c buildup tin foul nan injector tip. The reduced travel tin instrumentality nan strategy into reasoning nan DEF vessel level is low.

This triggers informing lights and codes, prompting drivers to refill nan tank. However, replenishing nan DEF whitethorn not lick nan guidelines rumor if nan injectors are still dirty.

Cleaning nan DEF injectors and clearing immoderate blockages is needed to afloat rectify nan problem.

3. Residual Ice Buildup

The 2nd communal origin of nan “Service DEF System” alert is crystal build up.

In very acold climates, crystal tin build up successful nan DEF vessel and components erstwhile temperatures are beneath 12°F.

As a result, nan Diesel Exhaust Fluid tin freeze, and sometimes it doesn’t thaw retired decently erstwhile it warms up.

If there’s still a furniture of crystal successful your vessel erstwhile it’s trying to measurement nan DEF level, it tin origin nan sensor to springiness that alarming correction message.

4. DEF Crystallization connected Sensor

If you unrecorded successful a very acold climate, past this

Long periods of acold vulnerability tin besides origin DEF fluid to crystallize connected vessel components for illustration nan level sensor.

Think of it arsenic nan frosty furniture wrong your freezer, but successful this case, it’s messing pinch your truck’s expertise to measurement DEF.

Crystals obstruct nan sensor and impact nan level of accuracy.

As a result, nan machine will prime up connected this and show nan ” Service DEF System See Dealer” informing message.

5. Low Diesel Exhaust Fluid

The 4th and last logic for nan “Service DEF System See Dealer” informing is that nan fluid level has dropped excessively low.

Low DEF Fluid The diesel exhaust fluid (DEF) vessel needs to stay sufficiently filled for nan strategy to run properly.

This typically happens erstwhile nan fluid is not topped up per nan recommended attraction schedule.

DEF breaks down complete clip and needs replenishing. The interval tin alteration based connected driving habits and conditions.

  1. Aggressive driving,
  2. Frequent towing,
  3. Heavy Load Towing
  4. Extreme temperatures

can accelerate DEF consumption. If ignored agelong enough, nan vessel tin tally astir empty.

This drastically skews nan sensor readings.

Once nan DEF reaches a critically debased threshold, nan informing ray turns on.

How to Fix and Reset nan Service DEF System See Dealer Message

Now that you cognize nan starring causes of this alert, let’s spell into much item connected really to hole and reset this message.

Depending connected nan main cause, present is what I urge that you do.

  1. Overfilled DEF Tank: Drain excess fluid until nan due capable level is reached. This restores nan aerial spread for nan sensor.
  2. Dirty DEF injector: Remove nan Injector and make judge that you cleanable it thoroughly
  3. Residual Ice Buildup: You’ll request to make judge your DEF vessel is wholly thawed. Ideally, fto your motortruck beryllium successful a lukewarm car shed aliases abstraction overnight. If there’s stubborn ice, you mightiness request to drain nan fluid and region each traces of it.
  4. DEF Crystallization: Flush nan vessel and components pinch caller DEF aliases distilled h2o to dissolve crystals.
  5. Low DEF Fluid: Add capable DEF to scope due capable level.

Resetting and Clearing nan work DEF strategy message:

After identifying and addressing nan cause, thrust your motortruck nether these conditions to reset nan message:

Maintain road speeds for astatine slightest 15 minutes, minimizing stops to trim fluid activity successful nan DEF tank. Ensure some nan ambient somesthesia and nan DEF vessel somesthesia are supra 4°C (39°F).

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