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On my 03 trailblazer the 4x4 isn’t working. I got about 15…

Customer Question
On my 03 trailblazer...

On my 03 trailblazer the 4x4 isn’t working. I got about 15 codes. U1048,U1016,U1024,U1026,C0300,C0305,C0306,C0321,CC0327,C0359,C0370,B0770,B0775,B0780,B0785,B0790,B2725,U1000,P0495,P0420,P0128,P1345. I have checked the frt. diff activator, The transfer case changes from 2hi to awd to 4hi to4lo. But I still don’t have 4x4. And I don’t have a service 4x4 light just a check engine light.

Mechanic's Assistant: Does the light stay on, or does it blink?

Stays on and every now and then it will go out. When I am driving it and then it comes back on

Mechanic's Assistant: Are you fixing your Trailblazer yourself? What have you tried so far?

Removing fuse #8,checked #48 fuse,changed fluid in transfer case and frt diff

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

No that is about it

Submitted: 6 months ago.Category: Chevy
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Answered in 3 minutes by:
12/4/2017
Chevy Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 6 months ago
Chad Farhat
Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
Category: Chevy
Satisfied Customers: 5,507
Experience: Owner at Carolina Auto Service & Sales , 20 years Experience in Foreign & Domestic vehicles A6 - Electrical / Electronic systems A7 Heating / Air Conditioning systems
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Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question and I will be posting your reply ASAP.

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Chevy Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 6 months ago

Clear all these faults,

using below procedure then rescan and tells me what comes back ?

lets start here and we go from there

Master reset Procedure

1- Disconnect Battery Cables ( Negative & Positive Cables )you can use any electrical wire as an extension if battery cables don't reach .

2- Hold cables Together for 60 secs ,then let go

3- Wait 15 minutes

4- Make sure all doors are closed

5- Reconnect battery Cables

6- Lock & unlock the vehicles using the key from driver door side (if you have a key fob with no blade key, just lock & unlock using the key fob buttons)

7- Enter the vehicle and attempt to start

Please let me know

Thank You

Chad Farhat

ASE Certified Technician

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Customer reply replied 6 months ago
Did what you said and no code lights came on. But still no four wheel drive. I only drove it about 10 miles
Customer reply replied 6 months ago
sir I drove it 10 miles and no check engine light or service 4x4 light came on.
Chevy Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 6 months ago
Ok we need to drive more it will throw a code , we need something to start with or we will be guessing just let me know , the control module is common but we have few other things let me know
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Chevy Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 6 months ago

You are very welcome :)

Please Read Below How to Get Back in touch with Me

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Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
Category: Chevy
Satisfied Customers: 5,507
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