Failsafe Engine Prog message with trifecta
 

Was driving today and got this message "Failsafe engine Prog" on the dash with the trifecta lights. I should have saved the error codes but was wondering if there was a common culprit for this. If it comes back I'll post the error log from the DME. Battery is a Deka AGM about 5 years old (I saw on another post that a weak/old battery can cause this issue).

If it clears it is likely alternator.

Monitor voltage live and see what happens when you come to a stop and go from power on to coasting.

If the voltage dips below 12.5 almost always alternator failure and the first sign is often trifecta and trans failsafe even before you get battery light for some reason.

Yeah it cleared when I stopped and restarted the vehicle.

Learn to use the hidden menu to monitor realtime voltage and see if you see a dip on off throttle. Both of our 01 models suffered this fate about 150-170k on the clock.

I rebuilt the voltage regulator with a $20 kit

Bad ignition switch can also cause this.

Where is the hidden menu?

What troubleshooting would you do to narrow it down, if it were a bad ignition switch?

Lots of things can cause the trifecta and "engine failsafe prog."

When my alternator went, it did not trip this code. (Neither time)
When my idle control valve was faulty, it tripped this code.

Pretty sure I saw it for other reasons over the years too, and saw it happen spuriously (i.e. without a reason).

+1, don't go assuming anything, you can do a quick check with a multimeter for charging voltage and maybe get yourself a cigarette lighter plug if you really want something handy to rule out charging voltage problems.

Difficult to diagnose 100% without taking it apart or renewing it. One test you can do is to open the sun visor vanity mirrors. Strange things can happen, when the light activates. If you have diagnostics it could show on some modules a code for temporary missing Terminal R or Terminal 15 voltage supply.

Got the error again and pulled the error memory and codes. MS43X reports DTC 211 which is "Idle speed actuator, mechanical fault". This is the only error reported by MS43X.

INPA error memory is as follows. Also has an idle air control error but has some other weird errors. I replaced the idle air control valve recently with a new "Standard Motor Products" part. Any ideas here? Something to do with the alternator, battery, loose connection? Also worth noting both times I got this error was going over a bump or railroad track, and both times the error cleared when I shut down and restarted.


E R R O R M E M O R Y R E P O R T -------------------------------------
Date: 07/19/25 10:33:09 ECU: D_EGS JobStatus: ---
- API job FsRead: job status error
- API job FsRead: job status error
================================================== ============ Variant: DSC57 1 Error in error memory
Error registration 1: 0x0076: Status DME internal error <<<<!!! Error accurances: 252
Vehicle speed 44.81 km/h
ASC not switched to passive ABS control passive BLS not activated
ASC control passive ACB passive
HBA passive ECD passive HDC passive
================================================== ================================================== Variant: MS430DS0 1 Error in error memory
Error registration 1: 0x00D3: LLFS Mechanical error <<<<!!! Error accurances: 1
Logistic counter: 39
Error accurance 1st time at:
MAF_KGH 108.94 kg/h N_32 1696.00 rpm PVS_AV 17.34 degrees TPS ISAPWM 87.05% occurred 0.20 h ago (rel. fuel temperature)
LLFS stuck open
---
---
---
Error is exhaust gas-related. Error debounced.
Error not currently present. Sporadic error.
Error code: D3 B1 01 27 14 35 25 DE 95 00
================================================== ============================================ Variant: LWS5_1B >>>>>>>>>> No error found <<<<<<<<<<< ================================================== ==================================== Variant: D_00AC -1 Error in error memory ================================================== ==================================== Variant: D_0070 -1 Error in error memory ================================================== ==================================== Variant: LCM_IV 1 Error in error memory
Error registration 1: 0x0028: thermal oil sensor defective <<<<!!! Error accurances: 4
Error currently not present Error code: 28 04
================================================== ======================================== Variant: D_0066 -1 Error in error memory
================================================== ======================================== Variant: D_009A -1 Error in error memory ================================================== ============================================ Variant: D_00E8 -1 Error in error memory ================================================== ============================================== Variant: D_0008 -1 Error in error memory ================================================== =================================== Variant: EWS3 1 Error in error memory
Error registration 1: 0x0013: WC tolerance increased for key number 1 <<<<!!! Error accurances: 31
Static error Error code: 13 3F
================================================== ========================================== Variant: D_00C0 -1 Error in error memory ================================================== ==================================== Variant: ZKE3_GM6 >>>>>>>>>> No error found <<<<<<<<<<< ================================================== ============================================ Variant: SZM38 >>>>>>>>>> No error found <<<<<<<<<<< ================================================== ============================================ Variant: MRS4 >>>>>>>>>> No error found <<<<<<<<<<< ================================================== ======================================== Variant: IKI 4 Error in error memory
Error registration 1: 0x00BD: EBV <<<<!!! Error accurances: 40
--
--
--
--
Error currently present sporadic error
Error caused by external control unit Error code: BD D0 28
------------------------------------------------------------------------------------ Error registration 2: 0x00F6: no CAN ID DMER1 <<<<!!!
Error accurances: 17
--
-- Line interruption --
--
Sporadic error --
Error code: F6 84 11
------------------------------------------------------------------------------------ Error registration 3: 0x00F7: No CAN ID DMER2 <<<<!!!
Error accurances: 17
--
-- Line interruption --
--
Sporadic error --
Error code: F7 84 11
------------------------------------------------------------------------------------ Error registration 4: 0x00F8: No CAN ID DMER4 <<<<!!!
Error accurances: 17
--
-- Line interruption --
--
Sporadic error --
Error code: F8 84 11
----------------------------------------------------------------------------------- ================================================== ======================================== Variant: D_00B0 -1 Error in error memory ================================================== ======================================== Variant: IHKA39_5 >>>>>>>>>> No error found <<<<<<<<<<< ================================================== ============================================== Variant: D_ZUHEIZ -1 Error in error memory ================================================== ==================================== Variant: D_0068 -1 Error in error memory ================================================== ==================================== Variant: D_006A -1 Error in error memory ================================================== ==================================== Variant: D_0048 -1 Error in error memory ==================================================================

Check the throttle body and idle air control connectors. If there has been some testing/prodding done there it could be a damaged socket/pin. I think someone else has had problems with an aftermarket IAC motor.