SPONSORED LINKS

Crank, no start, low voltage

Tiny
ROBOTECH2
  • MEMBER
  • 2003 GMC SIERRA
  • 6.6L
  • V8
  • 4WD
  • AUTOMATIC
  • 160,000 MILES
No or low voltage to cab. No interior lights, power windows and door locks not operating. Engine cranks and fires but shuts off immediately. DTC's are P 1626 and U 1026. Anti theft system is active and not getting fuel enable signal. The u 1026 code says no communication with ATC. Could my BCM be bad and if so what might be the cause? Batteries and alternator are new and charge is 100%.
SPONSORED LINKS
Thursday, April 25th, 2019 AT 4:35 AM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

It sounds like the fuse block may not be allowing voltage to the interior.

Yes, the BCM controls the anti-theft but the BCM needs power to work.

Test for power to the under hood fuse block as well as the ignition switch.

Roy
Images (Click to make bigger)
Thumb
Thumb
Thumb
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Thursday, April 25th, 2019 AT 5:03 AM
Tiny
ROBOTECH2
  • MEMBER
  • 3 POSTS
I have power at the fuse block. And I have power at the fuse block in the cab.
Was this
answer
helpful?
Yes
No
Thursday, April 25th, 2019 AT 5:26 AM
Tiny
ROBOTECH2
  • MEMBER
  • 3 POSTS
Maybe a grounding issue?
Was this
answer
helpful?
Yes
No
Thursday, April 25th, 2019 AT 5:27 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
No, it is a power issue.

Check the ignition switch voltage.

Roy
Was this
answer
helpful?
Yes
No
Thursday, April 25th, 2019 AT 5:39 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Did you respond? I got a notification but no response listed.

Roy
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Thursday, April 25th, 2019 AT 9:19 AM

Please login or register to post a reply.

Related Engine Not Running Content

How to fix an engine that wont start
VIDEO
How to fix an engine that wont start
Instructional repair video
Engine Not Starting - Top 3 Easy Steps
GUIDE
Engine Not Starting - Top 3 Easy Steps
Over the past 20 years on 2CarPros we have identified the top three problems that are easily fixed. This can save you a trip to the repair garage or calling a tow truck and...
VIEW MORE

Sponsored links