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What would make the service engine soon light illuminate?

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The Computer has found a circuit or system that has failed with the light on a code can be retrieved from the computer to pinpoint the system that has failed there is a 16 pin connector called "DLC" under dash in drivers area most codes start with a "p" and 4 digits

Posted on May 07, 2014

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Posted on Jan 02, 2017

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What does the service engine light mean on a 2015 Ford Edge


Service Engine Soon

If the Service Engine Soon indicator light stays lit after you've started the engine, the On Board Diagnostics system (OBD) has detected a malfunction of the vehicle emissions control system. Contact your authorized dealer as soon as possible.
If indicator light is blinking, an engine misfire may be occurring, which could damage your catalytic converter. Drive in a moderate fashion (avoid heavy acceleration and deceleration), and have your vehicle serviced immediately.*
The Service Engine Soon indicator light illuminates when the ignition is first turned on (prior to engine start) in order to test the bulb, as well as indicate whether the vehicle is ready for Inspection/Maintenance (I/M) testing.
Normally, the Service Engine Soon light will stay on until the engine is cranked, then turn itself off if no malfunctions are present. However, if after 15 seconds this light blinks eight times, it means that the vehicle is not ready for I/M testing.Check this link out Gary.
https://owner.ford.com/how-tos/vehicle-features/dashboard-instrument-cluster/warning-lamps-and-indicators.html

Jul 19, 2017 | Ford Cars & Trucks

1 Answer

P0627 on a ford ranger tdci canot find those modules and relays to check


n the event of fuel pump "A" control circuit fault, a trouble code will be stored and a service engine soon lamp will be illuminated. Some models require multiple drive cycles (as many as 8) with a failure in order for the service engine soon lamp to be illuminated and others will activate it on the initial failure. The "A" refers to more of an area of malfunction as opposed to a particular circuit or component.

Symptoms

Symptoms may include a stored trouble code, an illuminated fuel cap malfunction lamp, and possibly an illuminated service engine soon lamp. If this code is stored, and a service engine soon lamp has not yet been illuminated, the code may be shown as pending.

Common Causes

The most likely cause of this code being stored is a defective fuel pump or relay. Most fuel pump control circuits are integrated into the PCM. Other causes may include corroded, open, or shorted wiring or connectors in the CAN Bus harness, a loose control module ground strap or broken ground wire, the CAN bus may also be defective

Feb 29, 2016 | Ford Cars & Trucks

2 Answers

I have a 2003 Ford Explorer. Recently I noticed thsat a warning light "Service Engine Soon" illuminated on my dash and wont go away. I've never seen this before and Ive owned the car since 2003. What'


Hi Dennis
The light is warning you that there is a problem with the Engine management system, I cannot and no one else online can tell you what the problem is. But I can advise you to take your car to a workshop and have it scan, the technician will tell you.

Good luck

Apr 07, 2014 | 2003 Ford Explorer

1 Answer

I have a 2001 mustang bullitt that is showing service engine light on. Took it to mechanic and he put 2 different machines on it to show code for problem. No codes coming up and he can't turn off the...


There is a diagnostic procedure in the factory service repair manual for engine light lit ,no codes . Did you take it to ford dealer ? MIL - is referring to check engine , service engine soon etc...
  • MIL always on when engine is running (no DTCs):
  • MIL circuits
  • For Focus, Mustang, Town Car, Continental, LS6/LS8, Escape, Windstar, F-150, Expedition and Navigator/Blackwood:
  • Instrument Cluster, Section 413-01 of the Workshop Manual.
  • All Others:
  • GO to NB1

SERVICE ENGINE SOON indicator After the engine is started, the SERVICE ENGINE SOON indicator will prove out for a duration of three seconds. If the instrument cluster does not receive a message from the PCM within five seconds, the instrument cluster will illuminate the SERVICE ENGINE SOON indicator and log a diagnostic trouble code (DTC).

  • An indicator is inoperative/always on - SERVICE ENGINE SOON
  • Circuitry.
  • Bulb.
  • Instrument cluster.
  • PCM.
  • GO to Pinpoint Test P .

PINPOINT TEST P: AN INDICATOR IS INOPERATIVE/ALWAYS ON - SERVICE ENGINE SOON CONDITIONS DETAILS/RESULTS/ACTIONS P1 CARRY OUT THE INSTRUMENT CLUSTER SERVICE ENGINE SOON INDICATOR ACTIVE COMMAND Trigger the HEC active command MIL.
  • Did the SERVICE ENGINE SOON indicator illuminate?
Yes REFER to Powertrain Control/Emissions Diagnosis (PC/ED) manual.

No INSTALL a new instrument cluster; REFER to Instrument Cluster . CLEAR the DTCs. REPEAT the self-test.

Jul 18, 2017 | 2001 Ford Mustang

1 Answer

Service engine soon light illuminated


need to know what is the code for the service engine soon light for. cant help you without code number such as P0430 or any other codes starting with P. go to your local parts store and see if they can scan it for you to get the code and we can start there.

Sep 09, 2011 | 2005 Nissan Quest

1 Answer

What causes the '' Service Engine Soon '' light to come on?


The malfunction indicator lamp is illuminated when ever there is a fault in either the monitoring system or a control system which could cause damage to the engine or exhaust catalyst. It also illuminates when the exhaust catalyst has failed.

Dec 16, 2010 | 1998 Mercury Tracer

2 Answers

What does the "service engine soon" indicator light specifically mean?


when the service engine soon light is illuminated in your vehicle, it means that the on board self diagnostic system has detected a fault either in the engine, transmission, or accessory controls. when this light is illuminated, it means that there is a code stored in the vehicle memory which can be extracted with a code reader. any garage should be able to do this for you. good luck!

Aug 28, 2010 | 2003 Nissan Altima

1 Answer

Gauge light on?


Gauge light illuminates when the ignition is switched on. It should extinguish as soon as the engine starts.
If it illuminates with the engine running, it indicates a malfunction with the engine management system. Have this checked as soon as possible.
If it flashes when driving, reduce the vehicle speed immediately until the light illuminates constantly. If it continues to flash, avoid heavy acceleration and high engine speed, stop the vehicle and have it checked immediately.
On some vehicles this light may be red – again stop the vehicle and seek assistance.
If it is safe to do so, try stopping the vehicle, switching off the engine, wait two minutes, then restarting the engine to reset the engine management system.
With the light illuminated, the vehicle is still safe to drive as long as no other faults are apparent with the engine. Have the vehicle checked by a dealer or garage as soon as possible to avoid any damage being caused to the catalytic converter.

Jun 24, 2009 | 1998 Toyota Corolla

1 Answer

2003 Ponitac Aztec service engine soon light


The PCM is probably storing a B, C, or U code that your code reader doesn't read. Or, it's storing an enhanced P code. If the light goes on, trust me, there's a code stored. You need a professional level scan tool

Nov 09, 2017 | 2002 Pontiac Aztek

1 Answer

No service engine soon light when I try to get trouble codes


It comes on when the key is turned on to show it works, then it goes out as soon as the engine is started, it has a fuse, that will be marked, if the fuse is ok then you may have either a bad connection at the cluster connector or a bad ECM

Oct 20, 2008 | 1996 Dodge Caravan

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