Code P2103, car will not start?

Tiny
JOSE4AGUILAR6
  • MEMBER
  • 2011 NISSAN ALTIMA
  • 2.5L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 1,600,000 MILES
Car won't start. Got a code p2103 actuator high and I need the wiring diagram and some help diagnosing this.
Wednesday, June 25th, 2025 AT 12:54 PM

5 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 52,679 POSTS
So I would try servicing the throttle body first, this guide can help you with instructions below as well. After service clear the codes and try to start it up.

https://www.2carpros.com/articles/throttle-actuator-service

If cleaning it does not help you will need to replace the throttle actuator, (clear codes). Check out the images (below). Please let us know what happens.
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Wednesday, June 25th, 2025 AT 6:58 PM
Tiny
JOSE4AGUILAR6
  • MEMBER
  • 3 POSTS
So i' did replace the throttle body actuator. With no luck. It only cranks but won't start seems like I'm missing spark or a jump I'm not sure. So, I replaced spark plugs, ignition coils, spark plug wires, and throttle body. But a little background on the problem is my valve cover was leaking. The spark plug seals went out. And where the spark plug goes was filled up with oil all the way.
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Thursday, June 26th, 2025 AT 7:46 AM
Tiny
KEN L
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  • 52,679 POSTS
Yep, I would replace the valve cover gasket to help remove the oil from the spark plug wells.

P2103 - Throttle Actuator Control Motor Circuit High (Bank 1)

Then let's check the wiring from the PCM to the throttle actuator. This guide can help, and I have included the wiring diagrams as well so you can see which wires to test.

https://www.2carpros.com/articles/how-to-check-wiring

But before you do that lets test fuse #43 in the fuse panel under the hood and if that's okay swap out the throttle control relay. Here is the location inside the IPDM. Check out the images (below). Please let us know what happens.
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Thursday, June 26th, 2025 AT 9:52 AM
Tiny
JOSE4AGUILAR6
  • MEMBER
  • 3 POSTS
Hey. So I checked the ipdm and theirs a way of checking it by pressing the button that shuts the door 10x the ipdm will perform a self test if it works. Which in my case it didn't. So I replaced it and it still gives me the p2103 I wanna test the ecm wiring to the throttle body but don't have the information needed or I do but don't know where to begin. Also. Can a faulty ignition coil wiring be the reason why my car won't start? Please help. I appreciate it much in advance
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Wednesday, July 9th, 2025 AT 1:45 AM
Tiny
KEN L
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  • 52,679 POSTS
Yes faulty wiring can make the engine not start, if you look at my previous post you can see a guide and the wiring diagrams to see which wires go to the throttle body from the ECM. Let me know if you get stuck or have problems.
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Wednesday, July 9th, 2025 AT 5:53 PM

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