Fault code 0x27A2

SvenM5 · Sep 23, 2013

Hi all,

I have a fault code and get the reduced power massage.
0x27A2 drosselklappensteller enable-leitung bank2
P157F drosselklappenfreigabeleitung schaltkreis(bank2) leitungsunterbrechung

Anybody knows what this is?

Thanks
Sven

SvenM5 · Sep 23, 2013

Okay it seems to be the throttle sensor. Anybody knows where it is , is it near the actuators?

Thanks
Sven

jcolley · Sep 23, 2013

Throttle actuator, left side. Not the position sensor.

SvenM5 · Sep 24, 2013

Thanks jcolley!
I did a search and came to this thats why I assumed it was the sensor

Miguex said:
UPDATE!

If your car has an error code 27A2 or 27A1, you have a faulty Throttle Sensor in bank 1 or bank 2, replace the part ($127). Labour free if you do DIY. (about less of 1 hour).

BMW Part: 13627841705

RealOEM.com BMW E60 M5 Throttle Housing Assy (number 6)

Proudluke · Oct 17, 2015

Yes I've replaced the Throttle sensor but still showing same fault so it must be the actuator

rt7085 · Oct 17, 2015

Before you buy a new TA, what it specifically complains about is the enable line into the TA. In German it says it is interrupted. This enable line comes from the DME through the harness. It may just be a harness wire integrity issue when you ruffled it feathers under the hood. The way to check this is by switching the TA in place and see if the problem moves to the other side. If it stays it is the harness if not it is the TA.

2Live4 · Oct 17, 2015

I'd use DIS or similar software to clear the code and then go a diagnosis test to check the throttle actuators to confirm.

Proudluke · Oct 18, 2015

Thanks guys. rt7085 it was showing this fault before we ventured under the hood. 2Live4 cleared codes and and 27a2 plus new one 27af ?????????

rt7085 · Oct 18, 2015

Measure Impedance

That is very interesting. Well, it is either the harness and/or the ENABLE line. Somehow the DME runs a diagnostic check on this line, probably an impedance check. Internal to the TA this line leads to a comparator. On the bench I verified that this line does not turn off the TA. I think it just tells the TA not to function/move. The micro processor senses this line and makes a decision. I measured the expected resistance to GND and it is 102kOhms, verified on 2 units that work properly. Measure between pins 1 and 3 on the TA. See attached for TA pin numbering.

Larger than 100 kOhms is a design issue! Any PCB contamination or a compromise of wire insulation will reduce this value considerably and the diagnostics on the DME side probably trip up. Not sure at what exact value. Again, switching the units will reveal if it is the harness or the TA beyond the pin measurement.

rt7085 · Oct 18, 2015

27AF = Secondary Air Pump No Activity Detected

rt7085 · Oct 18, 2015

Translation

The -exact and correct- german to english translation of this is (because I speak German; this is not Google):

"0x27A2 drosselklappensteller enable-leitung bank2
P157F drosselklappenfreigabeleitung schaltkreis(bank2) leitungsunterbrechung"

"0x27A2 throttle value servo enable signal bank 2
P157F throttle value release signal circuit (bank 2) signal interruption"

.....which is suggestive of a diagnostic failure on that actual line. From experience, I can tell you that all signals in automotive modules, especially under the hood, with exception of power and ground, are typically diagnosable one way or the other.

But I could be wrong. (The usual disclaimer.)

J.R ///M5 · Jun 3, 2019

27A1 DME: Throttle-valve actuator, enable line bank 1

Hello guys,

Reviving old thread. I have been getting lately error code "27A1 DME: Throttle-valve actuator, enable line bank 1". Lot's of threads about this "enable line code" and some say it was the throttle sensor and some say it's not. Seems like member rt7085 has done some serious testing about the actuators and very useful information in this thread.

Do you have any information what are the conditions when DME shuts the throttle actuator down, and can anyone verify that is this code for line integrity or some internal fault in the throttle actuator?

Error goes away when i shut off the car and restart. Battery and charging are good. Planning to tear down the plenum at some point and check the actuators and enable line. Have to wait to get new laptop and diagnose car with ISTA because old laptop broke down...

So if anyone of you have encountered this problem and solved it, please chime in. I will report back when if have this problem solved. Thanks!

Matthew Cleary · Jun 4, 2019

solved it by replacing both TA's on mine. Are you getting the physical symptoms too? (limp mode on occasion, no DSC etc)

J.R ///M5 · Jun 4, 2019

Yes. When error occurs, getting limp mode, DSC etc. warnings right away after i start the car and touch the throttle pedal. Now it's been 3 days without the error. Forgot to mention those symptoms in previous post.

I'm thinking that the bank 1 actuator is failed internally and the "enable line" wire itself is in good shape. But you never know with BMW's.

Planning to change both actuators when i have time and get my new laptop. Also going to measure internal resistance from actuator pins. Yesterday i measured spare ones and those showed 102kOhms like rt7085 wrote some time ago.

Thanks for the input!

J.R ///M5 · Jun 14, 2019

27A1 DME: Throttle-valve actuator, enable line bank 1

A little update to my problem. A week ago i went to the local dealer for software update. I have been planning to do this update for a while. After the update no more codes from throttle actuator. I'm a little sceptical that the update fixed my problem but we'll see... If/when the error pops up again i'm changing the actuators for rebuilded ones.

Zac Cov · Jun 15, 2019

I have only had the fault code P157F and was hoping for some clarification, sorry if posted twice, phone acting up. Is this specific to the throttle actuator itself only or could it also be the sensor? Wanted to start process today of getting proper parts and tools. Thanks for any insight!

J.R ///M5 · Jun 17, 2019

Did you started to work with your problem? My advice is to remove throttle actuators and measure actuators enable line pins(explained above) or you could change those from bank to bank and see if the error code moves another bank. You should also check enable line wiring while your at there.

Still no limp mode or codes after my software update. One thing which i was thinking was a glitch in CAN-line, but who knows...

I don't know but maybe some of our DME software gurus can help with the conditions which will trigger this code. Maybe the throttle position sensor can fail without error codes and DME sees this and shut down the actuator? Didn't check the values when i had the problem active

Zac Cov · Jun 22, 2019

Fault code 0x27A2; JR///M5

Thanks for reply, I have not started yet as been busy at hospital lately and bad weather (car port is not a garage! Haha). I have all the tools needed now so I will probably switch the two out as I don’t think I have everything at moment to check it independently. I’ll follow up tomorrow after I undertake it (weather permitting). Would like to clean around once manifold is off, any solvent suggestions?

J.R ///M5 · Jun 23, 2019

Zac Cov said:
Thanks for reply, I have not started yet as been busy at hospital lately and bad weather (car port is not a garage! Haha). I have all the tools needed now so I will probably switch the two out as I don’t think I have everything at moment to check it independently. I’ll follow up tomorrow after I undertake it (weather permitting). Would like to clean around once manifold is off, any solvent suggestions?

You can use throttle body cleaner and micro fiber cloth for cleaning. Let us know how it turns out after you have changed the throttle actuators. Good luck!

J.R ///M5 · Jul 5, 2019

UPDATE: After the software update everything was fine for a while (I bet it had nothing to do for error occurance). Then "27A1 DME:Throttle valve actuator, enable line, bank 1" returned. I started to get it every day but after one or more restart it went away. One day i was driving quite hard and new code popped up "2B25 Throttle valve monitoring bank 1". It was time to take the plenum off and replace both actuators and see what's wrong. After i got plenum off, i manually operated the throttle valves (actuators and arms were still connected) and i notice that bank 1 was very weak and had some resistance comparing to bank 2. Took the actuators out and now the throttle valves moved same speed. Bank 1 actuator returning spring didn't work correctly and was 2. times slower than bank 2, so i found my problem.

I measured internal enable line from both old actuators and it showed 104kOhm so the lines were ok. Also measured the enable line wire for continuity just for fun, it was ok.

What i learned this time is 27A1 or 27A2 does not mean automaticly that your throttle valve sensor is bad, like the one thread in this forum tells you. Also it was easier for me to take both actuators out from the bank 1 side (passenger side).

ISTA also tells you these reasons / solutions about 27A1 error code:

1. Check enable line for continuity, if ok move to step 2.
2. Check throttle valves moves properly, if ok move to step 3
3. Replace throttle actuator

I hope this helps someone to chase down those 27A1 and 27A2 codes. This code could mean many things but in my case it told that DME had shutted down bank 1 actuator because the throttle valves didn't move properly.. It became clearer to me when i got that 2B25 code.

SlvrBlltE39 · Aug 8, 2020

J.R ///M5 said:
UPDATE: After the software update everything was fine for a while (I bet it had nothing to do for error occurance). Then "27A1 DME:Throttle valve actuator, enable line, bank 1" returned. I started to get it every day but after one or more restart it went away. One day i was driving quite hard and new code popped up "2B25 Throttle valve monitoring bank 1". It was time to take the plenum off and replace both actuators and see what's wrong. After i got plenum off, i manually operated the throttle valves (actuators and arms were still connected) and i notice that bank 1 was very weak and had some resistance comparing to bank 2. Took the actuators out and now the throttle valves moved same speed. Bank 1 actuator returning spring didn't work correctly and was 2. times slower than bank 2, so i found my problem.

I measured internal enable line from both old actuators and it showed 104kOhm so the lines were ok. Also measured the enable line wire for continuity just for fun, it was ok.

What i learned this time is 27A1 or 27A2 does not mean automaticly that your throttle valve sensor is bad, like the one thread in this forum tells you. Also it was easier for me to take both actuators out from the bank 1 side (passenger side).

ISTA also tells you these reasons / solutions about 27A1 error code:

1. Check enable line for continuity, if ok move to step 2.
2. Check throttle valves moves properly, if ok move to step 3
3. Replace throttle actuator

I hope this helps someone to chase down those 27A1 and 27A2 codes. This code could mean many things but in my case it told that DME had shutted down bank 1 actuator because the throttle valves didn't move properly.. It became clearer to me when i got that 2B25 code.

So what was the fix ? to replace both actuators?

platii · Aug 9, 2020

SIvrBIItE39, I guess the answer is yes, replace both actuator to fix the problem, or,
repair the gears. When you remove the actuators, test them by hands you may sense that one is sluggish to move which means they are not in synch anymore and the ECU wouldn't like that. You have to test the board though as stated in the previous post, if ok proceed to replace the gears and you should be ok.

Fault code 0x27A2

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