Limp Mode/Wrench/Check Engine Light

[dguns18]

About 5 minutes into my drive into work, driving about 35mph, the Pre-Collision assist warning appeared, and I figured it was just some snow or debris on my sensor and I thought nothing of it. About a minute later the Hill Start assist failure warning appeared, and the traction control failure warning appeared. After sitting at a stop light for 30 seconds, the truck would then not accelerate past 20mph, and then I got a check engine light warning. I recognized that the truck was in Limp mode, and drove it another 1/4 mile until where I could turn and park. I parked and turned the car off for a minute, and upon starting it the engine revved to 2500rpm, and idled pretty rough. I turned it off, gave it a minute, and upon starting it everything was normal (truck was NOT in limp mode) besides a check engine light. Drove it 5 minutes back home without issue and parked it.

On my FordPass app, it provided several warnings, to include the Hill Start Assist warning, Powertrain Malfunction/reduced power warning, Pre-collision assist warning, and service engine soon warning.

I have an OBDII reader on the way to hopefully shed some light on the issue, and I've read some stuff on the Forum about the EGR cooler sensor being the cause of the truck going into limp mode, but also read it could be a battery/low voltage issue (original battery) hence why multiple systems threw a code.

Any ideas or has anyone had this specific issue?


(for reference its 25 degrees, used remote start to warm truck up for a few minutes before driving, 80k miles on the motor, also found that it had low coolalnt after about 73k miles, has since been changed, confirmed no coolant in oil via Blackstone oil test just this week)

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[DukeCanBuildit]

It wouldn’t hurt to stop by your local AutoZone for a free battery test. As you’ve read, Gremlins start showing up when our batteries start fizzling out.

Out of curiosity, did you get one that also does the ABS bleed?

 

[mre]

It wouldn’t hurt to stop by your local AutoZone for a free battery test. As you’ve read, Gremlins start showing up when our batteries start fizzling out.

Out of curiosity, did you get one that also does the ABS bleed?

I love the picture. I remember them and really liked the Gremlin "X" though I never had one.

 

[RangerBill]

About 5 minutes into my drive into work, driving about 35mph, the Pre-Collision assist warning appeared, and I figured it was just some snow or debris on my sensor and I thought nothing of it. About a minute later the Hill Start assist failure warning appeared, and the traction control failure warning appeared. After sitting at a stop light for 30 seconds, the truck would then not accelerate past 20mph, and then I got a check engine light warning. I recognized that the truck was in Limp mode, and drove it another 1/4 mile until where I could turn and park. I parked and turned the car off for a minute, and upon starting it the engine revved to 2500rpm, and idled pretty rough. I turned it off, gave it a minute, and upon starting it everything was normal (truck was NOT in limp mode) besides a check engine light. Drove it 5 minutes back home without issue and parked it.

On my FordPass app, it provided several warnings, to include the Hill Start Assist warning, Powertrain Malfunction/reduced power warning, Pre-collision assist warning, and service engine soon warning.

I have an OBDII reader on the way to hopefully shed some light on the issue, and I've read some stuff on the Forum about the EGR cooler sensor being the cause of the truck going into limp mode, but also read it could be a battery/low voltage issue (original battery) hence why multiple systems threw a code.

Any ideas or has anyone had this specific issue?


(for reference its 25 degrees, used remote start to warm truck up for a few minutes before driving, 80k miles on the motor, also found that it had low coolalnt after about 73k miles, has since been changed, confirmed no coolant in oil via Blackstone oil test just this week)

Make sure that your OBDII code reader can read all the modules on the truck. Some inexpensive ones only read power train codes. Forscan program with an adapter will see all modules on the truck.

 

[Realtruck]

About 5 minutes into my drive into work, driving about 35mph, the Pre-Collision assist warning appeared, and I figured it was just some snow or debris on my sensor and I thought nothing of it. About a minute later the Hill Start assist failure warning appeared, and the traction control failure warning appeared. After sitting at a stop light for 30 seconds, the truck would then not accelerate past 20mph, and then I got a check engine light warning. I recognized that the truck was in Limp mode, and drove it another 1/4 mile until where I could turn and park. I parked and turned the car off for a minute, and upon starting it the engine revved to 2500rpm, and idled pretty rough. I turned it off, gave it a minute, and upon starting it everything was normal (truck was NOT in limp mode) besides a check engine light. Drove it 5 minutes back home without issue and parked it.

On my FordPass app, it provided several warnings, to include the Hill Start Assist warning, Powertrain Malfunction/reduced power warning, Pre-collision assist warning, and service engine soon warning.

I have an OBDII reader on the way to hopefully shed some light on the issue, and I've read some stuff on the Forum about the EGR cooler sensor being the cause of the truck going into limp mode, but also read it could be a battery/low voltage issue (original battery) hence why multiple systems threw a code.

Any ideas or has anyone had this specific issue?


(for reference its 25 degrees, used remote start to warm truck up for a few minutes before driving, 80k miles on the motor, also found that it had low coolalnt after about 73k miles, has since been changed, confirmed no coolant in oil via Blackstone oil test just this week)

Sorry that hear that happened to you! Although it's hard to tell for sure this sounds like a low voltage / failing battery issue. Sensors can read abnormally with voltage drops, especially pre-collision assist and your PCM can then dump you into limp mode. Could be something else but this seems most likely based on what you described!

 

[dguns18]

Not sure if the sensor can do the ABS bleed, not sure I would need it anyway since I just flushed the brake fluid and didn't have any issues.

The OBDII reader (Ancel AD410) indicated I have a P2112 error code (Throttle Actuator 'A' Control System - Stuck Closed). I reset the code, and unplugged the battery for 5 minutes. Drove the truck about 25 miles and did not have any issues.

I did get a notification from FordPass saying some remote start features were disable to preserve battery, so I'm thinking its a battery issue. Might pickup a new battery and see if that solves any issues, and if I get the P2112 error code I'll replace the throttle body).

 

[fusseli]

Definitely check/replace the battery first if it's still the original one. All kinds of weird shot happens when it die-dies.

 

[airline tech]

Code: P2112 refers to an issue with the Throttle Position (Input)
You may want to at least look at these PIDs to see if you see any dropouts.
Note: there are a number of PIDs related to these that provide - True/False, relating to error or mismatch of data.
I wanted to keep it somewhat simple as any fault (error) will be seen by these PIDs as that is where they will be picking it up.
I recommend checking these - for SAFETY especially if you had a 2500 RPM throttle bump at idle, Uncontrolled after start.

YES - The system should enter LIMP Mode as it did and if it fails again hopefully it will do the same.
Not trying to scare you - just a recommendation for safety reasons as you are trusting the PCM to follow its set commanded programmed procedure for TPS & AP (Mismatch Correlation) to revert to LIMP Mode.

Ironically, the TPS PIDs was part of my building a Ref: Database to have on file of what is normal to see - This was done yesterday:

Note: This is the KOEO (Key On Engine Off) Test

KOEO @ Rest

KOEO - Full Throttle
Ref: PIDs should change without any dropouts and slowly move along with slow movement of the Accelerator Pedal to (FULL THROTTLE) Pedal on the floor

KOEO - Full Throttle.

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