toyota avensis fault code c1201

[Angelic Upstart]

Hi everybody, Just curious if anybody could help, our Avensis d4d tspirit was fine when we went to work yesterday but when we came out of work 12 hours later we found the vsc, traction control and the malfunction indicator lamp were on. We have taken it to our mechanic who has said it is coming up with the error code c1201 but he's completely stumped as to what to do lol (really fills us with confidence!) We can't afford to go to the Toyota Dealership and wondered if anybody had any ideas what this is and how to fix it? Many thanks

[North East Tech]

Hi, c1201 relates to a communication stop between ECU's , it is possible that your mechanic did not look at the right system and probably assumed that as the vsc lights etc were illuminated then that is the system that is faulty. It is most likely that the fault is within the engine system but with vehicles equipped with vsc all systems are linked so a fault with one will log a code in all others ( normally a communication stop code as you have)

I would advise getting the other systems checked out.

[razon]

anybody knows what is parking brake system or vsc system.or fault code c1201

Edited July 14, 2016 by razon

[Nave]

Hi Razon

 

i have avensis 2010 and have same fault in it. I am research on it please keep in contact if you find anything 

thanks

[Nave]

Hi North East Tech

i also have same problem please advice how i can fix this problem

thanks

[Konrad C]

Have you all read this post? It may have the solution to your problems: - 

All the cars involved are diesel.

Get the codes too.

 

[Devon Aygo]

C1201 is a secondary code there will be one or more other Primary codes that are causing C1201 without these additional codes we have no way of knowing what the issue is.

[Nave]

Hi Devon 

two codes are scan in my car

1- u 0100. ( Lost communication history ECM/PCM 'A' )

2- c 1201 ( Engin control system malfunction )

[Devon Aygo]

1 hour ago, Nave said:

Hi Devon 

two codes are scan in my car

1- u 0100. ( Lost communication history ECM/PCM 'A' )

2- c 1201 ( Engin control system malfunction )

Again both are secondary codes I suggest the Diagnostic machine being used is not fully compatible with your car and is not reading all the codes codes stored.

[Rami chia]

 

So what is the code c1201 means? 

[mrfixer]

8 hours ago, Rami chia said:

 

So what is the code c1201 means? 

It means a loss of communication between the engine ECU and some other control system on the car. You should get another fault code along with C1201 - it is the other fault code which will help guide you to the problem.

[Rami chia]

Hi

The second code that is on the check engine is po420 any idea?

[Rami chia]

And another question is where is front head light senser on an avensis? 

[mrfixer]

12 hours ago, Rami chia said:

Hi

The second code that is on the check engine is po420 any idea?

Indicates fault with catalyst or oxygen sensors.

[paul9]

21 hours ago, Rami chia said:

And another question is where is front head light senser on an avensis? 

Look at this post and the second post after it:

 

[Dan1234]

I had the same fault. It's just a warning to say there is a problem. Ended up being the dpf system not being able to burn. It was over fueling and not getting the exhaust temp up. 

[Eugenio Sciortino]

Hi, I have the same problem on my 2010 Avensis Diesel. I had the air bag light which was on the dash until i found that I had a faulty slip ring squib.

I changed the squib ring and it solved the problem , air bag light is now off, but now I have the  parking brake system or vsc system.or fault code c1201.

This is because I took the steering wheel off? Any ideas or help, much appreciated.

 

[Hillbillie]

Did you fix this? Also do you mind telling me what the squib part number is, I´ve got a 2AD-FTV 2012(2.2  d4d) , horn doesn't work, but I can´t find the part number (nor the correct name, to find it)

Thanks in advance!, any help appreciated. 

[flash22]

10 hours ago, Hillbillie said:

Did you fix this? Also do you mind telling me what the squib part number is, I´ve got a 2AD-FTV 2012(2.2  d4d) , horn doesn't work, but I can´t find the part number (nor the correct name, to find it)

Thanks in advance!, any help appreciated. 

Its called a Spiral cable aka a clock spring, try and avoid Chinese junk parts

Pm me your VIN - be aware you need set up the SAS correctly