Question about 2005 Lincoln LS

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Fail safe mode is on and car will not start.iwas told that i need a pcm

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  • yadayada
    yadayada Mar 19, 2011

    The chances you need the PCM replaced are near zero.

  • Anonymous Mar 21, 2014

    how to tell if the PCM is bad



1 Answer

You have ETC Failsafe & Engine Temp Failsafe

Which do you have?

Nothing to do with PCM,who told you that,
and based on what type of testing ?

Posted on Mar 21, 2011


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Update 2005 Pontiac vibe , giving faults codes p0351,p0352,p0353,p0354,replaced p0352 coil . car running great.

It may run fine but it's in fail safe mode
DTC P0351-P0354
DTCs P0351 through P0354 Ignition Coil Primary/Secondary Feedback Circuit diagnostic monitors the primary circuitry of individual ignition coils for the successful completion of an ignition event. The ignition trigger signal and ignition fail-safe input signal provide crucial information in the control of ignition system timing and the activation of the fail-safe function. Based on the initial timing angle, calculated from the crankshaft and the camshaft position signals, the powertrain control module (PCM) calculates the ignition trigger signal. The ignition trigger signal is then sent to the ignition control circuitry located in each ignition coil. The ignition control circuitry initiates the ignition dwell period by commanding the power transistor ON. When the PCM determines the proper time to provide spark, the PCM turns OFF the ignition trigger signal. In response to the PCM signal, the ignition coil control circuitry turns OFF the power transistor, producing a high voltage discharge from the secondary coil windings. After the spark has occurred, the control circuitry sends an ignition fail-safe input signal back to the PCM, confirming that an ignition event has taken place. If the ignition fail-safe input signal is not received by the PCM, a cylinder specific DTC will set.
Anytime the fail-safe input signal is lost, engine operation will enter the fail-safe function. If engine load exceeds certain parameters during the fail-safe function, Fuel Cut-off mode is activated and fuel injector operation is ceased. The suspension of fuel injection in the Fuel Cut-off mode protects the catalytic converter from damage. Damage can occur when excess unburned fuel reaches the converter and causes the catalyst to overheat.

Diagnostic Aids
• Check for the following conditions:
- An interruption of the ground circuit or voltage supply to the ignition coil will prevent a proper ignition event from taking place. A DTC P0351 through P0354 will set if there is a fault in any of the ignition coil circuits.
- If DTCs P0352, P0353, and P0354 are present, the fault is located in the shared electrical circuits or shared components of the ignition coils.
- Inspect the ignition coil grounds at G 105 for a clean and tight connection.
- The scan tool data parameters for Misfire Current Cylinder # are frozen at the time the MIL illuminates when the DTC sets.
- If no engine misfire is felt when the DTC sets, inspect for a fault in the Ignition Fail-Safe Input circuit.
- Inspect the noise filter for an internal short or low resistance. The ignition coil may not receive adequate voltage during high load conditions if the noise filter is faulty. A good noise filter will indicate infinite resistance (OL) with a DMM after the capacitor inside the filter is charged up.
- Unless the ignition key is cycled or the DTCs are cleared, the PCM waits to receive ignition fail-safe signals before providing fuel injector operation.
• An intermittent malfunction may be caused by a fault in the ignition coil electrical circuit. Inspect the wiring harness and the components for an intermittent condition. Refer to Intermittent Conditions .
• Repair any electrical circuit faults that were found. Refer to Wiring Repairs .
• The information included in the Freeze Frame data can be useful in determining the vehicle operating conditions when the DTC first set.

Dec 22, 2017 | Pontiac Cars & Trucks

1 Answer

I have a 2004 ford explorer xlt. the indicator says engine fail safe mode. what could be the problem?

Failure Mode Effects Management (FMEM) is an alternate system strategy in the PCM designed to maintain engine operation if one or more sensor inputs fail.
When a sensor input is perceived to be out-of-limits by the PCM, an alternative strategy is initiated. The PCM substitutes a fixed value and continues to monitor the incorrect sensor input. If the suspect sensor operates within limits, the PCM returns to the normal engine operational strategy.
All FMEM sensors display a sequence error message on the scan tool. The message may or may not be followed by Key On Engine Off or Continuous Memory DTCs when attempting Key On Engine Running Self-Test Mode.
With the fail safe mode was the "Service" wrench light lit or check engine light ?

Feb 07, 2015 | 2004 Ford Explorer XLT

1 Answer

How do i fix a fail safe mode in a s type jaguar

great question, but engine failsafe or transmission?>
no year stated, and is very key to answers,
the PCM runs the engine, and if any sensor fails.
the PCM Sees that (called catastrophic monitors) and instead of
dying like a race car does (like this) the factory PCM is smarter than the average bear.
it MIMIC's the dead sensor from about 1985 to now. most cars, in USA. called OBD . "simulates it"
the ECu then logs ERRORS called DTCs ,you scan the PCM(or ECU) and it shows, say , dead CMP (crank sensor) "wild guess"

one example is a dead MAF, (or MAP) the simulation is very very crude, and engine will misfire and foul spark plugs with carbon.
this is very common, and worse prior to 1996 , in USA.

so the CEL lamp glow running, that means Scan ME.

Not starting is another matter,
good compression on all cylinders
good spark on all spark plugs, (not black tips (look)
good fueling, of the above 2 are good, all cars run with test fuel now for about 3 seconds, long each spray.

the fuel tank can be missing and i can keep the engine running for 5 minutes or longer, with my bottle of spray fuel.
proving , you have fueling problem
(low fuel pressure or too much)
ill not do fueling as that is 3 pages long "injector tests"

Jan 08, 2015 | 2005 Jaguar S-Type

1 Answer

2008saturn aura xe iwas driving and suddenly engine power reduced light came on and the car started shaking so I pulled over.what do I do?ineed to get home.

Low coolant, probably.The engine went into safe mode.
Ckeck it out on the internet, or owners manual. My wife's 2010 Impala will do this.

Oct 16, 2014 | 2008 Saturn Aura

1 Answer

My 2005 ford explorer 4x4 xlt (v8 4.6 ltr)has trouble code p2106. what does this trouble code mean?

P2106 is an informational code and is usually set by some other fault.

This DTC means is that the PCM detected a fault with the electronic throttle control and went into fail safe mode. It doesn't tell you specifically what system or component went haywire, just that something was wrong, the PCM didn't know what to do so it went to a known good operating parameter, in this case fail safe mode. Likely is a problem with the TPS sensor and will need to be replaced.

Hope this helps.

Oct 03, 2011 | 2005 Ford Explorer

2 Answers

I have a 2005 Lincoln LS. 3.9 v8. The problem started about two months ago. At first, about once a week, the ETC failure safe mode would come on. I could pull over and restart the car and the problem...

You never needed a dealer
You can forget the RF theory,the PCM is inside,behind the glove box
The Throttle Body is $578 at Lincoln, $638 at Ford,if the Throttle Actuator Motor failed (2107 & 2110),but it didn't,just got the code.

You should have PO 301 thru PO 308 codes,all others you disregard

You buy one new coil $59.00 at auto parts store, and it walk down cylinders, until you get the one,spiking the PCM,coming back on the TPS Sensor,then back to PCM,putting it into ETC Failsafe (Electronic Throttle Control) like toyota---drive by wire.

You need a 7mm socket to remove the coil covers and coils,on top of valve covers.

If it was a V6- you get problems,need to remove intake to get to 3 plugs.

Sep 19, 2010 | 2005 Lincoln LS

1 Answer

Transmission will not shift into high gear

Before guessing at transmission problems, check the fluid level (car warmed up, engine running in Park on level ground) and have the PCM scanned for trouble codes FIRST. This guide is meant for problems that do not show up as PCM codes (like shift A&B solenoid failures, for example).
Also note that many problems that show up as transmission issues are actually PCM or electrical, and may be external to the transmission. Try a different PCM, and check for chafing where the cables come out of the PCM.
What is "limp-home mode" ? This is a fault mode in which the transmission either loses electrical power or the PCM deactivates all of the electronics. The transmission will default to max line pressure. The driver will have Reverse and 3rd, with manual 2nd available by putting the gearshift in 2 or 1 (doesn't matter). 1st, 4th, and TCC lockup will not be available. It will not hurt the car to drive it like this for short periods, but use manual 2nd to get the car moving, and be aware that the trans will generate more heat than normal while operating in limp-home mode due to increased torque converter slippage during 2nd gear starts and no lockup in 3rd gear.
No 1st or 4th available; trans shifts 2nd to 3rd by itself in D or OD and locks the converter : ShiftA solenoid failed. Easy fix in the pan. Or a wiring problem from PCM to trans.. or PCM.
Trans shifts into gear harshly, car feels sluggish off the line, No 1st, 4th or TCC lockup available, Manual 2nd, 3rd and Reverse are only available gears, CEL is on: Transmision is either in limp-home mode or has lost electrical power. If there are lots of error codes in the PCM, check the underhood fuse that powers the transmission, and if it pops again, look for a short in that circuit like an O2 sensor harness touching exhaust. Otherwise, check PCM codes for a particular fault in the transmission causing the PCM to put it in limp-home mode.
Thank you for using fixya and good luck. Check all your fuses first to ensure it's not a simple as that before you take it to a transmission shop. Call around, most transmission shop will scan free of charge to inspect the condition of your transmission.

Apr 16, 2010 | 1998 Oldsmobile 88

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