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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Tue, Apr-03-2018, 02:27:23 AM   #1
Pbj24
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Default Throttle position problems, codes P0121 and P1637, new throttle actuator + sensors an

I've been chasing after a throttle position problem for months now. Car randomly throws an EML light and goes into limp mode. Getting codes P0121 and P1637. I have changed the front TPS by the filter, throttle actuator w/ the TPS, and the gas pedal in that order. But the car will still throw the EML light. I have also recently installed a new 12v.

I do not have access to GT1. Any suggestions? Any type of help is appreciated
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Old Tue, Apr-03-2018, 04:13:04 AM   #2
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

Quote:
Originally Posted by Pbj24 View Post
I've been chasing after a throttle position problem for months now. Car randomly throws an EML light and goes into limp mode. Getting codes P0121 and P1637. I have changed the front TPS by the filter, throttle actuator w/ the TPS, and the gas pedal in that order. But the car will still throw the EML light. I have also recently installed a new 12v.

I do not have access to GT1. Any suggestions? Any type of help is appreciated
Do you ever get jerking where power cuts on/off? Sometimes it's a bad maf. I had that issue and turned out to be the tune was for a short ram intake which relocates the maf, but I had a stock box. Basically previous owner sold the intake but didn't bother retuning.

Also, once you replace the tps, you should also be resetting the throttle adaptation.

Sent from my SM-G955W using Tapatalk
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Old Tue, Apr-03-2018, 06:22:17 AM   #3
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

I had the same issue as you. I bought a new top TPS, throttle actuator (came with a new TPS), and a gas pedal. The problem still occurred. Frustrated, I came on here to do more research. I found out, dirty connections can sometimes throw a code. I purchased a can of electronic connection cleaner from Autozone and sprayed down the connections. While I had the MAF out, I cleaned the MAF with MAF cleaner. Ever since that day, my car has never thrown a P1637 code again. Worth a shot, if you haven't tried this already. Best of luck!
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Old Tue, Apr-03-2018, 04:28:09 PM   #4
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

+1 on cleaning the connections. After replacing both TPS's my car frustratingly ended up in limp mode because the connector for the MAF was dirty, or so the mechanic I limped the car to insisted.
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Old Tue, Apr-03-2018, 04:50:47 PM   #5
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

Quote:
Originally Posted by maestro416 View Post
Do you ever get jerking where power cuts on/off? Sometimes it's a bad maf. I had that issue and turned out to be the tune was for a short ram intake which relocates the maf, but I had a stock box. Basically previous owner sold the intake but didn't bother retuning.

Also, once you replace the tps, you should also be resetting the throttle adaptation.

Sent from my SM-G955W using Tapatalk

Quote:
Originally Posted by silvergray545 View Post
I had the same issue as you. I bought a new top TPS, throttle actuator (came with a new TPS), and a gas pedal. The problem still occurred. Frustrated, I came on here to do more research. I found out, dirty connections can sometimes throw a code. I purchased a can of electronic connection cleaner from Autozone and sprayed down the connections. While I had the MAF out, I cleaned the MAF with MAF cleaner. Ever since that day, my car has never thrown a P1637 code again. Worth a shot, if you haven't tried this already. Best of luck!


Quote:
Originally Posted by ATB88 View Post
+1 on cleaning the connections. After replacing both TPS's my car frustratingly ended up in limp mode because the connector for the MAF was dirty, or so the mechanic I limped the car to insisted.


I did remove the MAF and cleaned it. However I did not clean the connector, I'll clean that today. How do you reset the throttle adaptations?


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Old Thu, Apr-05-2018, 05:42:44 AM   #6
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

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Originally Posted by Pbj24 View Post
I did remove the MAF and cleaned it. However I did not clean the connector, I'll clean that today. How do you reset the throttle adaptations?


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I do it through bmwlogger, but there are other softwares that do it too. I don't believe you can do it without connecting to the odb port. There's some free software as well that does it, I just can't remember the name. Ask in the coding section of the forums. Def a lot of knowledge there.

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Old Thu, Apr-05-2018, 07:38:01 AM   #7
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

I'm also in a very similar position to OP at the moment. Hopefully someone can provide some assistance which will help both the OP & I

My M3 first experienced an issue a few weeks back where whilst driving (highway, 100km/h, cruise control on!), the throttle went jittery and jumpy, then went to limp mode with no power etc. I did not have an EML or check engine light. Scanned for codes that night and retrieved codes 118, 119, 120, 121 & 230.

118 - Electronic Throttle Potentiometer Bank 1
119 - Electronic Throttle Potentiometer Bank 2
120 - Electronic Throttle Potentiometer Comparison
121 - Electronic Throttle Both Potentiometers Faulty
230 - Electronic Throttle Setpoint Value Deviation


I replaced the battery as that died (never replaced it in over 3 years of ownership), also replaced the fuel pump with a Walbro 255 (upon advice from many people that the issue could have been a faulty or failing fuel pump, I now know this was note the case).

Car then drove 100% normal for about a week until I received EML + DSC + Yellow Hand Brake lights. Scanned for codes again, same codes as above.

Two nights ago I removed the intake plenum and replaced the bottom Throttle Position Sensor (bolted to the Throttle Body Actuator). Car started and drove, however wouldn't rev properly and once again threw the EML etc lights.

My guess is either the Throttle Pedal TPS (i.e. the sensor in the accelerator pedal) or the Throttle Body Actuator is faulty and needs replacement?

Engine wise, it has a K&N Typhoon intake. I've cleaned the pod-filter many times and re-oiled with a little genuine K&N oil. Never cleaned the MAF. Also has a Build Journal B-Spec Tune.

Looking for help/advice to fix this issue!

Edit: I'll remove the MAF tonight and clean with MAF cleaner. I'll also use electrical contact cleaner to clean all contacts.

Last edited by Syfon; Thu, Apr-05-2018 at 08:13:20 AM.
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Old Thu, Apr-05-2018, 07:19:29 PM   #8
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

Be sure that the throttle actuator rod is not hitting anything and rotates with no obstructions. I installed new intake clamps and the bolts on the rod would hit the screw heads on the clamps and through the car into limp mode .I rotated the clamps and problem was solved.
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Old Thu, Apr-05-2018, 11:15:41 PM   #9
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

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Originally Posted by carson432 View Post
Be sure that the throttle actuator rod is not hitting anything and rotates with no obstructions. I installed new intake clamps and the bolts on the rod would hit the screw heads on the clamps and through the car into limp mode .I rotated the clamps and problem was solved.
I checked this when I installed the new hose clamps. They clear and do not contact anything.
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Old Fri, Apr-06-2018, 01:50:22 AM   #10
FrankJones
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Default Re: Throttle position problems, codes P0121 and P1637, new throttle actuator + sensor

Make sure your new TPS are genuine BMW parts. Don’t do anything aftermarket when it comes to electronics. That was my issue.
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Discussing Throttle position problems, codes P0121 and P1637, new throttle actuator + sensors an in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)