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G35 Sedan V35 2003-06 Discussion about the 1st Generation V35 G35 Sedan

P0128 & U1001 Engine Code

     
Old Jan 5, 2015 | 04:08 PM
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ImJJames's Avatar
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P0128 & U1001 Engine Code
P0128 = Coolant Thermostat Problem
U1001 = Communication Circuit Fault

I am replacing my thermostat today, what could be causing U1001 though?
 
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Old Jan 7, 2015 | 11:20 AM
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That;s a code for a connection issue.

Was any of the harness disassembled at some point? Was the car in an accident? Any damaged wires? etc.

I would change the tstat, erase both codes and see what comes back.
 
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