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P0016 sensor A, but OPDA changed long ago

Biff67

New Member
Joined
Jun 21, 2021
Messages
2
Location
Waretown, NJ
2006 TJ Unlimited, 4.0, 6 speed. 167k. I had replaced the OPDA probably 4 or 5 years ago and swapped the Mopar sensor as everyone recommends. Ran well for years until.... Yesterday i popped a P0016, sensor A code while on the highway. Runs fine at part throttle, but stumbles hard under full throttle. I used the good Omix OPDA when I changed it. I'm afraid it's the cam gear. It's a bit cold to be swapping cams. Thoughts?
 

ItchyDong

Airframe & Powerplant LJ Mechanic
Supporting Member
Joined
May 20, 2020
Messages
485
Location
Dothan, Alabama
The only way to truly troubleshoot this is by checking for 5 volts and grounds at the cam and crank plugs, and then scoping the cam and crank signal wires. Anything outside of this is guessing and chucking parts at it. You could pull the OPDA and do a visual on the cam gear or pull the crank sensor and OPDA cap and look at the tone wheels, but that's usually reaching.

Edit: could also be that it legit got bumped out of time if the hold down bolt on the OPDA came loose, you jumped a tooth on the timing chain or you shifted a key on the cam or crank...., but again, that's all unlikely but something to look at.
 
Last edited:

JKP

TJ Enthusiast
Joined
Aug 20, 2020
Messages
622
Location
Warner Robins GA
The Mopar sensors fail just like any others, my OEM sensor went at 115K mi, the OPDA was still OK.

Put the aftermarket sensor back in it and see if it fixes it. Free and a few mins time.
 

ItchyDong

Airframe & Powerplant LJ Mechanic
Supporting Member
Joined
May 20, 2020
Messages
485
Location
Dothan, Alabama
The Mopar sensors fail just like any others, my OEM sensor went at 115K mi, the OPDA was still OK.

Put the aftermarket sensor back in it and see if it fixes it. Free and a few mins time.
That's all fine and dandy. In my experience, a failed sensor will throw a 340 or a 344. This code says that the PCM is receiving a signal, but it is out of time. You're right though, throwing an old sensor in there isn't hard. Go for it.
 

JKP

TJ Enthusiast
Joined
Aug 20, 2020
Messages
622
Location
Warner Robins GA
The only way to truly troubleshoot this is by checking for 5 volts and grounds at the cam and crank plugs, and then scoping the cam and crank signal wires. Anything outside of this is guessing and chucking parts at it. You could pull the OPDA and do a visual on the cam gear or pull the crank sensor and OPDA cap and look at the tone wheels, but that's usually reaching.

Edit: could also be that it legit got bumped out of time if the hold down bolt on the OPDA came loose, you jumped a tooth on the timing chain or you shifted a key on the cam or crank...., but again, that's all unlikely but something to look at.
Now that I think about it, I did have the hold down bolt loosen on mine once and have to adjust it
 
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Biff67

New Member
Joined
Jun 21, 2021
Messages
2
Location
Waretown, NJ
Crank sensor is also a possibility. Try a reset and see what new codes come up.
Post in thread 'Any benefit to resetting PCM?'
https://wranglertjforum.com/threads/any-benefit-to-resetting-pcm.15762/post-254238
I did this reset per the thread. I also found something interesting after thrashing around on the interwebz...a youtube vid where a guy replaces his OPDA and it does not immediately cure his issue. His fix is to slightly adjust the OPDA housing counterclockwise. About 1/8 or 1/4 inch. I did this in addition to the reset. When I replaced the OPDA back when, I couldn't tell if the cam gear itself had wear. If it did, perhaps it took this long to wear-mate with the new OPDA gear and lost just enough timing to throw the code. Not sure which one worked, but the Jeep's running good again. Thanks everyone for the help!