P2138 code- Accellerator position sensor issue
Thread Starter
Racer
Joined: Feb 2009
Posts: 318
Likes: 16
P2138 code- Accellerator position sensor issue
Having trouble with my 2013 Grand Sport, auto. While cruising down the highway the car went into limp mode. I don't have a scan tool so when I saw the P2138 code on my reader I decided to replace the pedal assembly, not the fix. After reading here and elsewhere, I see that a common cause for this is the X184 connector being corroded. I can't find any info as to the location of this connector OR what it looks like. Just that it's a 40 pin connector.
Any help locating it...
In the cabin?
In the engine compartment?
Drivers or passenger side?
Color of the connector?
Is it a bulkhead connector? If so does it unplug from inside or out?
A picture would be awesome!
Any help you can provide would be great!
Tom
Any help locating it...
In the cabin?
In the engine compartment?
Drivers or passenger side?
Color of the connector?
Is it a bulkhead connector? If so does it unplug from inside or out?
A picture would be awesome!
Any help you can provide would be great!
Tom
Safety Car
Joined: May 2006
Posts: 3,668
Likes: 472
From: Potomac MD
You may also look at the TB connector it is a 6 pin on the TB. They are also another source of the code. Make sure it goes on nice and tight (all the little copper connectors) and the wires aren't bent too bad etc. Mine ended up being a bad wire on mine and I had to get a pigtail to put on. They sell lots of them and are easy to find on line so that will give you a clue that this has been a problem.
Safety Car
Joined: Mar 2007
Posts: 4,340
Likes: 538
From: Sarasota FL
St. Jude Donor '25-'26
OP, did you find the problem?
Mine threw the P2138 code yesterday. For $70 I purchased the pedal assembly which should be here in 3 days.
I am not very confident that this will be the fix.
Mine threw the P2138 code yesterday. For $70 I purchased the pedal assembly which should be here in 3 days.
I am not very confident that this will be the fix.
Race Director
Joined: Dec 2013
Posts: 12,497
Likes: 3,623
Tech II on car, reading BCM data, look at throttle percentage, and throttle body percentages to see which one the BCM data is telling you is the problem. What you are looking for is smooth changes as you work both, and not drops in reading dead spots or no connectivity isntead.
Before replacing the parts , check the wiring connectors, since it a 50/50 shot that is a wiring problem and not a sensor problem isntead.
Before replacing the parts , check the wiring connectors, since it a 50/50 shot that is a wiring problem and not a sensor problem isntead.
Thread Starter
Racer
Joined: Feb 2009
Posts: 318
Likes: 16
Sorry I didn't respond sooner but I "think" it s resolved. I did locate the X184 connector. on my Auto car it's right behind the battery. Battery must be removed. Took it apart, sprayed electrical contact cleaner on both ends, liberally, more than once. Once all back together I Started it and all seemed good. Check engine light gone. tried power braking to see if power was restored and the tires spun. Took it for a spin and made sure 
all was good and it seems fine. Didn't have dielectric grease for the seal, Bought some and when I get to it I'll take pics for others. Hipe this helps and good luck.
BTW, I replaced the pedal first, no help at all. I'd check the connector before opening the box. I have an extra pedal now...
all was good and it seems fine. Didn't have dielectric grease for the seal, Bought some and when I get to it I'll take pics for others. Hipe this helps and good luck.BTW, I replaced the pedal first, no help at all. I'd check the connector before opening the box. I have an extra pedal now...
Safety Car
Joined: Mar 2007
Posts: 4,340
Likes: 538
From: Sarasota FL
St. Jude Donor '25-'26
I installed a new accelerator pedal assembly this morning
The check engine light is off and the car runs great. So far so good but I am not confident the problem is solved. I do not normally drive this car on the street but over the next few weeks I will have to get it on the street to see if the code returns.
Unfortunately I am going to skip a track day at Sebring this weekend to avoid the possibility it throws the code and ruins the day.
I do not have the position sensor pin outs identified so I could not check if the original sensor is faulty.
The check engine light is off and the car runs great. So far so good but I am not confident the problem is solved. I do not normally drive this car on the street but over the next few weeks I will have to get it on the street to see if the code returns.
Unfortunately I am going to skip a track day at Sebring this weekend to avoid the possibility it throws the code and ruins the day.
I do not have the position sensor pin outs identified so I could not check if the original sensor is faulty.
