Welcome to Justanswer, My name isXXXXX am here to help.
Hi Danny. Cruise control is driving both me and the dealer crazy. As stated it works sometimes, sometimes will not engage and sometimes will engage and then quit. Dealer has replace the brake switch twice and the PCM the last time in. the error code keeps coming up brake switch which seems unlikely every time.
I do not know what the specific code is displayed. All I know is the dealer says is the brake switch code every time.
well there are two of those which can be different if its P0571 which is brake switch malfunction
Then it has to be within that cirsuit
This runs the tail lamps and the signal to the ECM for cruise
OK but I do not get why it works intermittently.
This is because something is shorting intermittently
Could be a brake light that is shorting out
Or a wire to the brake switch itself getting a short
Thats what I think as well but how would you trouble shoot the entire circuit.
If brake lights work, what then.
You will take a test lamp between the stop lap switch signal circuit and a good ground
then check for short to voltage
Going to need a little more info on that as I have not tried yet to test the brake switch.
Are there any relays in the circuit that might be temperature sensitive. Or will self reset with by turning the engine off.
The dealer told me the transmission is also connected to the circuit. Any possibility that the transmission sensor is the problem.
The problem is most likely the connector to the switch itself
This would normally show a code
And you would have problems shifting
OK. I am taking the truck in again tomorrow morning. Should I suggest what you have highlighted. A bad connector seems likely to me as well. anything else to suggest?
This is the only thing it can be at this point. The system is detecting a fault in that circuit itself
Those connectors are know for failure as you can see there is a part number on the image
OK. thanks. I will get them to change the connector and check the brake circuit. Let me
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