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My 2011 GMC Sierra won't start by key with just the T harness THAR-GM4 completely plugged in.

0 votes
With the T Harness plugged into both connections without the EVO-ALL connected the key will not start the engine.  If I disconnect the CAN Bus connecter and reconnect the factory CAN Bus connecter the truck starts by my key.  So I guess my question comes down to does the EVO-ALL have to be plugged into the T Harness for me to use my key? The harness is THAR-GM4
asked Feb 17, 2020 in GMC by Tom Cook (130 points)

1 Answer

0 votes
Need to connect at least the RED connector to the EVO. Immo power is interupted which is why you cannot start with the key
answered Feb 17, 2020 by Robert T (280,310 points)


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