Hello GMT Nation I have a 03 GMC Envoy xl 4.2 6CYL. with a problem with intermittent cruise control activation . Sometimes it comes on others it doesn't ,when it is on it stays on till di activated my problem is should I first look at the switch on the turn signal or the brake switch please refer me to any posts on this issue I understand that it is a common issue ...thanks Javindra
Intermittant cruise control problem
- Thread starter JAVINDRA
- Start date
best guess would be the brake switch. You can take it apart and inspect the contacts... or just replace it as it is relatively cheap. The main problem is that the contacts tend to get "burnt" due to how the switch functions (long copper member which is bent repeatedly by the brake action... eventual the contact point is making poorer and poorer contact causing arching which burns the contact more).
Mooseman
Moderator
Thanks for the reply the brake switch is by far the easiest and cheapest option but I have a gut feeling that it is the column switch because all three brake lights are working
Thanks for the reply I will hook up my code reader and check for errors as for the brake switch all my lights are operating normally I have a gut feeling that it is a defective column turn switch
djthumper
Administrator
My issue is that the cruise controll doesn't always set sometimes it is simply shutting off the ignition and then restarting but it works properly when it is on . I will though replace the brake switch first before I tackle the column switch. ...thanks for the reply
Sorry what I meant to say is just by stopping and turning off the the ignition for a minute the restarting sometimes is enough to get the cruise control to set once you are up to speed ...sorry for the confusion
you are describing a classic case of "pending P01345" this code will disable cruse. when you cycle the ignition the code clears' cruse starts working.
your problem is in the CPAS.
JS
your problem is in the CPAS.
JS
OK it is the crankshaft position actuator sensor or actuator but not sure if that is my cause but it is possible. I have to check for codes but other than the cruise issues I don't yet have any other symptoms of the dreaded p1345 but thanks very much for the reply
there are other pending codes that will cause the cruise to not operate. You will need a reader that provides pending codes other than one that just looks for codes that set the check engine light... as pending codes won't set the light.
m.mcmillen
Member
When I first bought my trailblazer, the cruise control would work intermittently and cycling the key would make it work. About a week after I bought it, I got a P0128 code which is for low coolant temperature. I'm sure it had a pending code in there and that's why it wouldn't work. The thermostat finally stuck open for enough drive cycles to trigger the check engine light.
I changed the thermostat and never had a cruise control problem again.
I changed the thermostat and never had a cruise control problem again.
I really appreciate all the replies to this issue of intermittent cruise control set and I now realise it is more complicated than I originally thought. How do I know if I have a pending p 1345 code if it doesn't show up on the reader and I don't have any symptoms yet other than the cruise issue
CPAS Cam Position Actuator Solenoid. Up above power steering pump
Torque Pro and android phone and bluetooth ELM327 ODBII.
It will show up after a cold start.
JS
Torque Pro and android phone and bluetooth ELM327 ODBII.
It will show up after a cold start.
JS
ok guys I just hooked up my OBD 2 to check for trouble codes and got 2 fault codes...PO340 position A bank 1 circuit malfunction and also PO304 cylinder 4 misfire so you guys that are talking about the camshaft position sensor appear to be correct but I am not sure about the rest of the fault sensor A bank 1has anyone got this particular fault message ...thanks... ps I have 348,000 klm or about 216 thousand miles for my American friends on the vehicle I erased the codes and will monitor in a couple of days
Mooseman
Moderator
Check the wiring to the cam sensor. It's in a vulnerable spot and could get damaged at the sensor. If it checks out, replace the sensor. Not too expensive and easy to do.
For the P1345, after fixing the cam sensor issues, you'll see if this is also fixed. If not, this code WILL disable your cruise control (ask me how I know).
For the P1345, after fixing the cam sensor issues, you'll see if this is also fixed. If not, this code WILL disable your cruise control (ask me how I know).
to all that replied to my post about intermittent cruise control on a GMC Envoy thanks for your replies and that I finally sorted it out ....the problem was a bad cam position sensor and a bad ignition coil