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Diesel Services

Aftertreatment Diagnostics

When you run into problems with your diesel vehicle, contact SOS Radial Tire. We have the right diagnostic tools and equipment to identify the cause and perform the proper diesel repair service. Learn more about diesel warning lights and the actions you should take when they turn on.

Choose a topic to learn more:

We serve Garden City, GA, Savannah, GA, Port Wentwoth, GA, and surrounding areas.

Engine Lamp Identification Guide

Read the engine lamp guide from Cummins for On-Highway, Heavy Duty, and MidRange Engines with Aftertreatment.

LAMP DESCRIPTION DRIVER ACTION 
Check engine light

Check Engine Lamp
Lights up to warn driver to seek service soon.

Flashing Check Engine Light
Will flash for 30 seconds at key ON if maintenance is due

Service must be performed at earliest opportunity. Vehicle may still be operated until end of shift.

MIL Light

Malfunction Indicator Lamp (MIL)
Lights up to warn the driver to schedule service soon. May light up in addition to other lamps

Service must be performed at earliest opportunity. Vehicle may still be operated until end of shift.

Red check engine light

Red Stop Engine Lamp
Indicates that engine must be stopped as soon as it is safe to do so.

Flashing Red Stop Engine Light
Indicates driver has 30 seconds to stop vehicle safely before automatic engine shutdown (if the Engine Protection Shutdown feature is enabled)

Vehicle must not be operated. Arrange for immediate service.

HEST warning light

High Exhaust System Temperature (HEST) Lamp
Indicates that high exhaust temperatures may exist due to aftertreatment regeneration.

Make sure exhaust pipe outlet is not directed at any combustible surface or material. If excessive odor or white vapor are present, have exhaust system inspected for leaks

DPF warning light

Aftertreatment DPF Lamp
Indicates that the aftertreatment Diesel Particulate Filter (DPF) requires regeneration.

Flashing Aftertreatment DPF Lamp
Aftertreatment Diesel Particulate Filter requires regeneration. Engine power may be reduced automatically.

1. Make sure the DPF Switch is not in the inhibit position.

2. At earliest opportunity, bring vehicle to highway speed for at least 20 minutes

3. If pervious step is not possible, or if lamps remain illuminated, perform a parked regeneration.

NOTE: An illuminated HEST Lamp will indicate that regeneration is underway.

Flashing DPF light and Check engine light

Flashing Aftertreatment DPF Lamp & Check Engine Lamp
Aftertreatment Diesel Particulate Filter requires regeneration. Engine power will be automatically reduced further.

1. Make sure the DPF Switch is not in the inhibit position.

2. At earliest opportunity, bring vehicle to highway speed for at least 20 minutes

3. If pervious step is not possible, or if lamps remain illuminated, perform a aprked regeneration.

NOTE: An illuminated HEST Lamp will indicate that regeneration is underway.

red engine light and DPF lamp

Red Stop Engine Lamp & Aftertreatment DPF Lamp
Aftertreatment DPF regeneration has not been completed successfully in a timely manner.

Vehicle must not be operated. Arrange for immediate service.


Four Stages of DEF Related Warnings

Read the DEF warning guide from Cummins.

LAMP DESCRIPTION DEF GAUGE DRIVER ACTION 
DEF light

Solid Diesel Exhaust Fluid (DEF) Lamp
DEF is low

Check engine light Refill DEF tank with correct type of DEF
DEF light and check engine light Solid DEF Lamp & Check Engine Lamp
Indicates lower DEF level, incorrect DEF type, or an SCR system issue. Driver will experience a mile loss of engine power.
Check engine light

Refill DEF tank with correct type of DEF as soon as possible. If lamp stays on, schedule service immediately.

DEF light and check engine light

Flashing DEF Lamp and Solid Check Engine Lamp
Indicates that DEF level is critically low, incorrect DEF type or an SCR system issue for more than five hours. Driver will experience a severe loss of engine power.

Gauge example

Refill DEF tank with correct type of DEF as soon as possible. If lamp stays on, schedule service immediately.

Stop engine light, flashing DEF light, Solid check engine light

Stop Engine Lamp with Flashing DEF Lamp and Solid Check Engine Lamp
Indicates that DEF level is critically low and fuel tank has been refilled without refilling DEF tank, or engine has idled for an hour or been shut down. Vehicle will be limited to 5mph.

Gauge example

Refill DEF tank with correct type of DEF as soon as possible. If lamp stays on, schedule service immediately.



What is Selective Catalytic Reduction?

Selective Catalytic Reduction (SCR) is an advanced active emissions control technology system that injects a liquid-reductant agent through a special catalyst into the exhaust stream of a diesel engine. The reductant source is usually automotive-grade urea, otherwise known as Diesel Exhaust Fluid (DEF). The DEF sets off a chemical reaction that converts nitrogen oxides into nitrogen, water and tiny amounts of carbon dioxide (CO2), natural components of the air we breathe, which is then expelled through the vehicle tailpipe.

Diesel trucks, from light to heavy, have undergone significant technological and mechanical changes in recent years; nowhere is this more evident than in the evolution of exhaust system aftertreatment. The impact on maintenance costs resulting from SCR system adoption has been remarkable. Fleets report maintenance cost increases of $0.08 to $0.10 per mile and, in other cases, aftertreatment system maintenance now rivals tire costs as their most expensive maintenance item.

What many fleet operators have yet to recognize is that, while the SCR aftertreatment system may become a truck’s most expensive maintenance item, it is likely the most vulnerable to compromise and failure due to seemingly minor and unrelated causes that until now may have been largely ignored in routine maintenance practices.

Contact us about Diesel Services

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Phone: (912) 964-5511
Fax: (912) 964-5566
Address: 115 Kicklighter Way
Garden City, GA 31408
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