Electrical AND Power Train Issues - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

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Old 02-09-2019, 08:55 PM
ajwgeek ajwgeek is offline
Junior Member
Join Date: Feb 2019
Posts: 2
Electrical AND Power Train Issues

Hi Everyone,
I've got a 2005 Trailblazer that's been very reliable thus far. It's about -5F outside tonight and it wouldn't start at first. Held the gas pedal to the floor and got it to start.

Now that it's started, my dash is lit up like a Christmas tree. I've got a Check Engine, Power Train, Brake, and ABS light. My 4WD selector is blinking on A4WD and solid on 2WD. Additionally the blower motor is non-functional for the heater.

When using my cheap eBay Code Scanner, the only code is unrelated. It's an evap code from forgetting my gas cap on the roof last week when filling up.

I was able to confirm that I do NOT have ABS or 4WD. I can lock the wheels up very easily by slamming on the breaks, and cannot climb the snowbank by my driveway without spinning the tires.

As for the blower motor, none of the settings (0-5) are functional. The A/C and defrost lights do come on when pressing the buttons, but no blower motor.

Additionally, all of the power locks, windows, mirrors, dash gauges, interior and exterior lights work great!

I've tried unplugging the battery for a few minutes, checking some of the under-hood and under-seat fuses for A/C, PCM, and Blower. The Check Engine light is now gone, but the Power Train , ABS, and Brake lights are still lit up and the behavior is the same.

Wondering what to check next, really hoping to make it into work on Monday.
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Old 02-10-2019, 12:23 AM
rrt898's Avatar
rrt898 rrt898 is offline
Junior Member
2004 Chevy TrailBlazer LT
Cranberry Red Metallic 4.2L I6 4X4
Join Date: Jan 2019
Location: New Jersey
Posts: 10
Ignition Switch

[B]I have an 04 LT and something similar happened to me and it was the ignition switch. I just had my every dash light on. My A/C controls were not affected when I had this happen. The switch also didn't throw a code but; I was used a cheap scanner also.

Just my experience.[/B]
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Old 02-10-2019, 06:05 AM
princej99 princej99 is offline
New Member
2008 GMC Envoy SLE
Bordeaux Red Metallic 4.2L I6 4X4
Join Date: Jan 2018
Location: ont
Posts: 533
hi and welcome, sorry to hear about the issues your having.

i tend to agree with the ignition switch . if there's no other codes and all fuses/relays look good. then the ignition switch is a good place to start.

its a cheap and easy to replace part.
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Old 02-10-2019, 01:52 PM
ajwgeek ajwgeek is offline
Junior Member
Join Date: Feb 2019
Posts: 2
Thank you, rrt898 and princej99! Picked up a new ignition switch this morning and it’s back up and running. I appreciate it.
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Old 02-15-2019, 11:45 PM
DChild DChild is offline
Junior Member
2003 Chevy TrailBlazer LS
Indigo Blue Metallic 4.2L I6 4X4
Join Date: Nov 2008
Location: Denver, CO
Posts: 4
Bad ignition switch?

I had this issue with my 03 Trailblazer. Replaced the ignition switch and still having the same problem. Anyone else have this issue after replacing the ignition switch?
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