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Old 05-30-2009, 06:39 PM   #1
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DTC P2135 throttle position sensor problem

I have been having a random code send my car into reduced engine power. It is code p2135 throttle position sensor A/B voltage correllation?? I have swapped the throttle pedal and throttle body and checked all connections. Anybody else ever had this? I can clear the code with a tech II and then the car will run fine. It usually happens after I have run the car for a few miles and thenshut it down for a while...upon starting I usually get the code within a mile?? i read somewhere it could be a low battery voltage problem or PCM problem???
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Old 05-30-2009, 06:59 PM   #2
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i have a snap on scan tool but in some areas a tech 2 is better...before you clear the code check if the ecm is holding a fault data and/or does the tech 2 have any tests you can run,can you look at multiple data lines....can the scan tool flight record...is there a WOT switch hooked up to/through the TAC module ?
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Old 05-30-2009, 07:06 PM   #3
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Quote:
Originally Posted by BAADC6 View Post
I have been having a random code send my car into reduced engine power. It is code p2135 throttle position sensor A/B voltage correllation?? I have swapped the throttle pedal and throttle body and checked all connections. Anybody else ever had this? I can clear the code with a tech II and then the car will run fine. It usually happens after I have run the car for a few miles and thenshut it down for a while...upon starting I usually get the code within a mile?? i read somewhere it could be a low battery voltage problem or PCM problem???
Wow Ed cant figure it out???
Id tell ya but Ed would say its over my head LOL!
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Old 05-30-2009, 07:14 PM   #4
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Wow Ed cant figure it out???
Id tell ya but Ed would say its over my head LOL!
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Old 05-30-2009, 07:15 PM   #5
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Quote:
Originally Posted by BAADC6 View Post
I have been having a random code send my car into reduced engine power. It is code p2135 throttle position sensor A/B voltage correllation?? I have swapped the throttle pedal and throttle body and checked all connections. Anybody else ever had this? I can clear the code with a tech II and then the car will run fine. It usually happens after I have run the car for a few miles and thenshut it down for a while...upon starting I usually get the code within a mile?? i read somewhere it could be a low battery voltage problem or PCM problem???
Have Ed check the tune. The new beta software has more tables in it to adjust the throttle. Might be something simple. Also check to see if anything it hitting the trottle plate. I have had filters break up and hit the trottle plate makeing the same code appear.

Good luck...
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Old 05-30-2009, 07:16 PM   #6
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Quote:
Originally Posted by extanker View Post
i have a snap on scan tool but in some areas a tech 2 is better...before you clear the code check if the ecm is holding a fault data and/or does the tech 2 have any tests you can run,can you look at multiple data lines....can the scan tool flight record...is there a WOT switch hooked up to/through the TAC module ?
I'll have to check?? I know the tech II can move the throttle body and perform some tests. ed did a few tests. problem is that everytime I take the car to the shop it's fine I drove for hours with ed and the techII and hp tuners logging and no problems....He gave me his tech 2 to keep with me just in case i get stranded
He is going to check it out for me monday.... i was just trying to get a little info to help
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Old 05-30-2009, 07:18 PM   #7
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Originally Posted by Braciole View Post
Wow Ed cant figure it out???
Id tell ya but Ed would say its over my head LOL!
he'll probably figure it out monday...i was just curious if anybody else ever had this code
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Old 05-30-2009, 07:21 PM   #8
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Quote:
Originally Posted by crushmonster View Post
Have Ed check the tune. The new beta software has more tables in it to adjust the throttle. Might be something simple. Also check to see if anything it hitting the trottle plate. I have had filters break up and hit the trottle plate makeing the same code appear.

Good luck...
thanks
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Old 05-30-2009, 07:24 PM   #9
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Quote:
Originally Posted by BAADC6 View Post
thanks
Anytime... somthing has to be hittin the trottle plate.
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Old 05-30-2009, 07:33 PM   #10
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Originally Posted by BAADC6 View Post
I'll have to check?? I know the tech II can move the throttle body and perform some tests. ed did a few tests. problem is that everytime I take the car to the shop it's fine I drove for hours with ed and the techII and hp tuners logging and no problems....He gave me his tech 2 to keep with me just in case i get stranded
He is going to check it out for me monday.... i was just trying to get a little info to help
Surprising whoever that tech guy is steering you into the wrong function and does not know what TPS is ?

Gas pedal would be APP 1,2,3 and would have their own DTC error codes.

That error is for TPS and relies on the sensor on the other side of the TB.
It is common with fricked up air mods to confuse the PCM or TAC as to the amount of airmass versus the reported butterfly angle.
Else the sensor, bad crimps to the pins plugged into TPS or at the connector end of the TAC.

Kinda funny is we Corvette owners know more about these cars then the claimed tuner pros.

The throttle position (TP) sensors 1 and 2 are potentiometer type sensors each with three circuits:

A 5-volt reference circuit
A low reference circuit
A signal circuit
The TP sensors are used to determine the throttle plate angle for various engine management systems. The control module provides each TP sensor a 5-volt reference circuit and a low reference circuit.

The TP sensors then provide the control module with signal voltage proportional to throttle plate movement. Both TP sensor signal voltages are low at closed throttle and increase as the throttle opens. When the control module detects that TP sensor 1 signal and TP sensor 2 signals disagree or signal voltages are outside the predetermined range, this DTC sets.


Conditions for Running the DTC

DTCs P1518 or P2108 not set.
The ignition switch is in the crank or run position.
The ignition voltage is more than 5.23 volts.

Conditions for Setting the DTC

The TP sensor 2 disagrees with the TP sensor 1 by more than 7.5 percent.
The above condition is present for more than 1 second.

Action Taken When the DTC Sets

The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame and/or the Failure Records.
The control module commands the TAC system to operate in the Reduced Engine Power mode.
A message center or an indicator displays Reduced Engine Power.
Under certain conditions the control module commands the engine OFF.

Conditions for Clearing the MIL/DTC

The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
Clear the MIL and the DTC with a scan tool.

Diagnostic Aids

Inspect the throttle actuator control (TAC) module connectors for signs of water intrusion. If water intrusion occurs, multiple DTCs may set without any circuit or component conditions found during diagnostic testing.

When the TAC module detects a condition within the TAC system, more than 1 TAC system related DTC may set. This is due to the many redundant tests run continuously on this system. Locating and repairing 1 individual condition may correct more than 1 DTC. Disconnecting components during testing may set additional DTCs. Remember this if you review the stored information in Capture Info.
If this DTC is determined to be intermittent, refer to Intermittent Conditions .

Test Description

The number below refers to the step number on the diagnostic table.

When the TAC module detects a condition within the TAC system, more than 1 TAC system related DTC may set. This is due to the many redundant tests run continuously on this system. Locating and repairing 1 individual condition may correct more than 1 DTC. Disconnecting components during testing may set additional DTCs. Remember this if you review the stored information in Capture Info.
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Old 05-30-2009, 09:06 PM   #11
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Quote:
Originally Posted by racingvette View Post
Surprising whoever that tech guy is steering you into the wrong function and does not know what TPS is ?

Gas pedal would be APP 1,2,3 and would have their own DTC error codes.

That error is for TPS and relies on the sensor on the other side of the TB.
It is common with fricked up air mods to confuse the PCM or TAC as to the amount of airmass versus the reported butterfly angle.
Else the sensor, bad crimps to the pins plugged into TPS or at the connector end of the TAC.

Kinda funny is we Corvette owners know more about these cars then the claimed tuner pros.

The throttle position (TP) sensors 1 and 2 are potentiometer type sensors each with three circuits:

A 5-volt reference circuit
A low reference circuit
A signal circuit
The TP sensors are used to determine the throttle plate angle for various engine management systems. The control module provides each TP sensor a 5-volt reference circuit and a low reference circuit.

The TP sensors then provide the control module with signal voltage proportional to throttle plate movement. Both TP sensor signal voltages are low at closed throttle and increase as the throttle opens. When the control module detects that TP sensor 1 signal and TP sensor 2 signals disagree or signal voltages are outside the predetermined range, this DTC sets.


Conditions for Running the DTC

DTCs P1518 or P2108 not set.
The ignition switch is in the crank or run position.
The ignition voltage is more than 5.23 volts.

Conditions for Setting the DTC

The TP sensor 2 disagrees with the TP sensor 1 by more than 7.5 percent.
The above condition is present for more than 1 second.

Action Taken When the DTC Sets

The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame and/or the Failure Records.
The control module commands the TAC system to operate in the Reduced Engine Power mode.
A message center or an indicator displays Reduced Engine Power.
Under certain conditions the control module commands the engine OFF.

Conditions for Clearing the MIL/DTC

The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
Clear the MIL and the DTC with a scan tool.

Diagnostic Aids

Inspect the throttle actuator control (TAC) module connectors for signs of water intrusion. If water intrusion occurs, multiple DTCs may set without any circuit or component conditions found during diagnostic testing.

When the TAC module detects a condition within the TAC system, more than 1 TAC system related DTC may set. This is due to the many redundant tests run continuously on this system. Locating and repairing 1 individual condition may correct more than 1 DTC. Disconnecting components during testing may set additional DTCs. Remember this if you review the stored information in Capture Info.
If this DTC is determined to be intermittent, refer to Intermittent Conditions .

Test Description

The number below refers to the step number on the diagnostic table.

When the TAC module detects a condition within the TAC system, more than 1 TAC system related DTC may set. This is due to the many redundant tests run continuously on this system. Locating and repairing 1 individual condition may correct more than 1 DTC. Disconnecting components during testing may set additional DTCs. Remember this if you review the stored information in Capture Info.
There ya go... "by the book"
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Old 05-30-2009, 09:21 PM   #12
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Originally Posted by Braciole View Post
Wow Ed cant figure it out???
Id tell ya but Ed would say its over my head LOL!
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Old 05-30-2009, 09:37 PM   #13
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Don't know what year you have, but I had the same problem. It actually happened to me at the track rental. I have an 06,

This is the fix for the 06's....

Under Engine Diagnostics----General----TPS Sensor there are two settings

P2101 Postive 6.91%
P2101 Negitive 6.91%

These two should be set at 9-10% depending on your cam.

Also under P0068----Enable RPM should be set higher than your idle. Say around 1500rpms.

Hope this helps.
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Old 05-30-2009, 09:59 PM   #14
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Quote:
Originally Posted by Tony B View Post
Don't know what year you have, but I had the same problem. It actually happened to me at the track rental. I have an 06,

This is the fix....

Under Engine Diagnostics----General----TPS Sensor there are two settings

P2101 Postive 6.91%
P2101 Negitive 6.91%

These two should be set at 9-10% depending on your cam.

Also under P0068----Enable RPM should be set higher than your idle. Say around 1500rpms.

Hope this helps.
Thanks Tony. The car is an 05 but all the electronics are 06, is this something I would change with HP tuners? I am going to buy HP just for logging purposes etc. but don't have it yet. I'll have it checked on Monday
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Old 05-30-2009, 10:02 PM   #15
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Quote:
Originally Posted by BAADC6 View Post
Thanks Tony. The car is an 05 but all the electronics are 06, is this something I would change with HP tuners? I am going to buy HP just for logging purposes etc. but don't have it yet. I'll have it checked on Monday

Yes, these setting are in the HPTuners VCM Editor. Since you have the 06 ecm it should work great.
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