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2011 atima codes p11778 and p0420 help Forums > > 2011 atima codes p11778 and p0420 help 2011 atima codes p11778 and p0420 help
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  #1  
Old 03-31-2017, 06:21 PM
Mike62202 Mike62202 is offline
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2011 Altima Sedan
 
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Default 2011 atima codes p11778 and p0420 help

Have a 2011 altima with 167264 miles,ran fine then when it warms up two codes pop up.p1778 and p0420 then the car seems like power loss and had to drive 40 mph home.checked codes and cleared,again ran fine for 30 minutes then codes again,any help please
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  #2  
Old 03-31-2017, 06:36 PM
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NissanTech NissanTech is offline
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Unfortunately, the P1778 code means you have a problem with transmission.

P1778 NISSAN - Step Motor Function
Read more: https://www.autocodes.com/p1778_nissan.html

And the P0420 code means that the catalytic converter has failed.

P0420 NISSAN - Catalyst System Efficiency Below Threshold Bank 1
Read more: https://www.autocodes.com/p0420_nissan.html
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Old 03-31-2017, 06:43 PM
Mike62202 Mike62202 is offline
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Is it possable the bad cat is heating up trans and it's going into safe mode
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Old 03-31-2017, 10:18 PM
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bennyb53 bennyb53 is offline
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2002 Altima
 
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Quote:
Originally Posted by Mike62202 View Post
Is it possable the bad cat is heating up trans and it's going into safe mode
Aagh Negative. If you look closely the Tranny is not connected to the CAT. So the CAT and Transmission do not interact with each other.

The power produced by the engine is transmitted to the Torque Converter which in turn transmitted to the transmission consisting of many gear sets like the planetary set up; planetary gear, sun gear, ring gear which changes the gear ration according to engine speed. This is also controlled by electronic module like the Valve Body in automatic transmission. In manual transmission, you have to manually shift the lever to change the gear ratio say from 1st gear to second and to Third, etc.

You mentioned the car goes into a Limp Mode probably caused by the DTC P1778. I suggest you have it properly diagnosed. At 167k miles I won't be surprised the CAT (P420) has failed and will need to be replaced.
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