No crank stuck in park service brake system alert

Tiny
HARPES66713
  • MEMBER
  • 2005 GMC ENVOY
  • 4.2L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 113,000 MILES
Comes and goes but today the envoy would not crank, shift from park and had a service brake system warning. After cycling the keys multiple times it started and everything is normal. Acts like a brake pedal switch from the 90", s. No ObII codes so I am stuck.
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Monday, June 15th, 2015 AT 9:50 AM

6 Replies

Tiny
JDL
  • EXPERT
If the starter motor won't crank, have to check the starter motor wiring circuits. Usually two voltage circuits, one is battery voltage, hot all the time. The other voltage circuit goes hot with key in the crank position and is wired through the neutral switch. The starter grounds through the engine block. Any testing at the starter, make sure tranny is in park or neutral and the parking brake is set.

If it cranks good but won't start, have a helper crank it, while you visually check for spark at the spark plugs. If spark everywhere, use a gage and check proper fuel pressure. Also, check for fuel injector pulse, engine cranking. Sometimes, if you cycle the key several times before you crank it, it can help prime the fuel system.

As far as shifting out of park issue, check the shift interlock system. Also when problem is ongoing with shift, step on the brake, see if any brake lites?

Battery has a full charge?
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Monday, June 15th, 2015 AT 11:18 AM
Tiny
HARPES66713
  • MEMBER
Starter wiring is fine. Don't think that would have any to do with the service brake system warning that happens every time. Plus the locking of the shifter probably not related and I know it has nothing to do with fuel pressure. Changed out the brake switch but no change but will tinker abit more. Seems like the switch is linked to the shift interlock which makes sense. Started thinking if it might have some thing to do with the ignition switch? Think the key is in the service brake warning. Why would this disappear after cycling the keys? Is there an interlock in the ignition or am I off in left field. I will check my ground but seems a like a long shot.
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Monday, June 15th, 2015 AT 4:52 PM
Tiny
HARPES66713
  • MEMBER
Just verified brake lights work fine.
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Monday, June 15th, 2015 AT 7:06 PM
Tiny
JDL
  • EXPERT
You said, "it won't crank". If starter motor won't crank, what I posted about starter motor circuit, is right on the money.

Sometimes when people say it won't crank, they mean, it cranks good but won't start. I'm just trying to figure out exactly what your saying? Sometimes when you track down one circuit, it may well fix other issues.

At the moment, if starter motor won't crank, I don't care about the brake service. I don't believe you said, the starter motor would crank? You do have shift interlock and the brake is part of that system.

I'm not trying to argue, just trying to understand. You can always get the starter motor to crank, by using jumper wire across switch side of relay, as long as there is voltage to switch side of relay. If you try that, just be sure the tranny is in park or neutral and the parking brake is set.
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Tuesday, June 16th, 2015 AT 11:48 AM
Tiny
HARPES66713
  • MEMBER
Fixed it today by replacing the cylinder mechanism and went ahead and replaced the ignition switch. Not trying to argue but as long as the brake service required is on you will not get the trani out of park. You can jump wires on the starter but as long as the the interlock is there it's a bad day. AS I mentioned a
Earlier all three things happen every time together. NO crank( key will turn but starter does not engage_click or anything. Vehicle won't shift out of park and the brake service warning is displayed. Turn the key to start position rapidly several times and the vehicle starts and shifting and brakes are normal. Not for sure which was the fix but I found several similar postings about the cylinder being a problem so went ahead and did both for $58.00
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Tuesday, June 16th, 2015 AT 12:54 PM
Tiny
JDL
  • EXPERT
Hey, glad you got it going. Not sure I was much help? If you want donation back, holler, I'll talk to the boss. No problem.

Have a good day.
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Tuesday, June 16th, 2015 AT 1:13 PM

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