engine failsafe mode...

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

anthony d

Member
Joined
May 7, 2010
Posts
10
Reaction score
0
Location
NY/NJ Metro Area
hello all, first thread here...

did a search, didn't find anything relevant to my situation.

ok, so here is the deal. i have a 2006 expedition limited, with a tad over 53k miles. while i was driving at approximately 65mph the other night, i noticed the speedo needle was starting to drop, and then go back to the speed i was traveling. looked at all the other gauges, and everything was fine. engine temp was fine, battery was fine, oil pressure was fine. shortly after that (within a minute or so), the check engine light came on, the display said "engine failsafe mode", the "o/d off" light started flashing, and the speedo dropped to 0. the engine went into limp mode, so i pulled over to the side of the road to check things out. there was plenty of coolant, oil was full, transmission fluid was full.

so i started the motor again, and it was the same. "engine failsafe mode" showed on the display, the check engine light was on, the "o/d off" light was flashing, and the engine was in limp mode. i was about an hour from home, so i called a tow truck, and got the truck home.

i looked in the manual for "failsafe mode", but the only thing i could find had to do with the engine overheating, or being low on coolant, which it wasn't.

any ideas on what it could be?
 

KWT2000

Full Access Members
Joined
Feb 4, 2010
Posts
2,382
Reaction score
43
Location
NINE MILE FALLS
it sounds like a faulty engine temp sensor for the ECM... there are seperate sensor for the gauge
 
OP
OP
A

anthony d

Member
Joined
May 7, 2010
Posts
10
Reaction score
0
Location
NY/NJ Metro Area
ok, so i borrowed an obd2 code scanner from a buddy, and got 2 codes. i got P0720, which appears to be a speed sensor issue, and P2106, which appears to be a throttle actuator control system issue.

any advice? can i just replace the speed sensor and the throttle position sensor? can't be that easy, right?
 
OP
OP
A

anthony d

Member
Joined
May 7, 2010
Posts
10
Reaction score
0
Location
NY/NJ Metro Area
ok, so with some more research, i came to the conclusion that the p0720 code (oss) is a detail of the p2106 (etc) code. so i am thinking it is safe to assume that my issue is with the output shaft speed sensor...
 

jv2000

Member
Joined
Jan 20, 2013
Posts
5
Reaction score
1
Location
Salt Lake City
Get yourself a nice (and more importantly inexpensive) code reader so you don't have to borrow it from your friend. Seriously it'll pay for itself in a jiffy

Here's a good one for cheap...

Autel-Maxiscan-MS300.jpg
Autel MaxiScan MS300 OBDII Scan Tool
ir
 

Latest posts

Members online

Forum statistics

Threads
53,391
Posts
500,598
Members
46,798
Latest member
geovanni
Top