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Discussion Starter · #1 ·
Hi everyone, my brothers car is acting up, misfire during normal driving, and when idling, his turbo is surging making the whole car shake a bit on and off. Anyway, he took it to the dealer and they said he was getting the DTC p1231 and the Throttle Body would need to be replaced. I wanted to find out what this code was, but I cant find any info online. It's not everyday that you just replace the throttle body though. Can anyone enlighten me on what this code means? Thanks!
 

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New TB, Not really....but

I don't think there's a way to replace that potentiometer though...From the WIS:

P1231

Throttle Position Sensor 1 and 2 Circuit. Sum Out of Range (No Limp Home).

Brief disturbances in throttle valve control that cause the engine to jerk.

Introductory information
•The DTC should be ignored if it appears along with other throttle body related DTCs.

Purpose
The purpose of this DTC is to notify that sporadic jerkiness has occurred at constant speeds and/or that idling is irregular. The jerkiness may be relatively uncommon and produce a sensation similar to driving over small holes in the road. In the worst cases the phenomenon may be similar to rapid, brief losses of engine power, which can lead one to believe that the ignition discharge module is faulty.



Note The jerkiness must not be confused with the jerkiness that can occur at high engine loads.



Technical explanation
The phenomenon is due to faults in one of the potentiometers (pot.1) in the throttle body. The

9-5 (9600) 3 20031

2. Engine\Trionic T7, 4-cylFault diagnosis, fault codes - P1...

throttle will briefly move towards closed. This may give rise to an irregular idling speed or jerkiness during cruising. The disturbance is harmless from a safety point of view and does not affect exhaust emission control.



Diagnostic procedure
Ask the customer how often and for how long the symptom is experienced and how serious the problem is (does the throttle body need changing?).

On-Board Diagnostics
Type of diagnosis:
-Continuous.


Enable criteria:
-Engine speeds up to 4000 rpm.
-Constant accelerator position.


The number of jerks is registered and stored by the engine management system and ultimately generates the DTC.

Fault criteria:
-The engine management system has on repeated occasions registered that the throttle valve has not followed the request of the control module.



Dependents:
-None.


System reaction to a fault:
-None.

OK report:
-The DTC is erased if no jerkiness is detected for a long period of time.



Good Luck



 

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Discussion Starter · #3 ·
Thanks for the reply. Exactly what I was looking for. Well, I found a few things to try by navigating the forums a bit. I will post back with the final result. Thanks again.
 

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My 9-5 year 2000 had the same code while it was hesitating and surging on the highway, and hard to start first thing in the morning. Before taking an expensive repair I ran a can of BG 44-K through a tank of gas - which I made sure did not contain any ethanol. Two months later, no codes, no problem. I guess something was blocking a jet which the additive cleared out. I wish every problem would be this simple. Surely this hail mary won't work for everyone, but this time it worked for me.
 
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