Code P1850

RICHARD F

MEMBER
2004 CHEVROLET TAHOE
5.3L
V8
4WD
AUTOMATIC
180,000 MILES

Intermittent check engine light, brake band solenoid circuit.
Transmission seems to shift fine.
What is a probable cause and repair?

Monday, September 24th, 2018 AT 9:24 PM

6 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Good morning.

Can you verify the code? There is no code listed for P1850?

Roy

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Tuesday, September 25th, 2018 AT 3:43 AM

RICHARD F

MEMBER
3 POSTS

Code P1850, brake band solenoid curcuit.

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Tuesday, September 25th, 2018 AT 7:20 AM

ASEMASTER6371

MECHANIC
52,797 POSTS

Are you sure it is a P code and not a C code?

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Tuesday, September 25th, 2018 AT 7:48 AM

RICHARD F

MEMBER
3 POSTS

Thanks for your time.
You must not know GM's trouble codes very well. I can google GM and get the list of codes, just do not know what it means.

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Tuesday, September 25th, 2018 AT 12:19 PM

ASEMASTER6371

MECHANIC
52,797 POSTS

I know codes inside out on all manufacturers.

Unless you gave me the wrong information on your vehicle, that code does not apply to your truck.

Roy

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Tuesday, September 25th, 2018 AT 1:16 PM

KEN L

MASTER CERTIFIED MECHANIC
42,895 POSTS

Here is what I found on the p1850:

"P1850 Chevrolet Description

With the engine running, Transmission Control Module (TCM) High Side driver is closed, the Power-train Control Module (PCM) detects that the Band Control solenoid was commanded off and the feedback voltage was less than 2.45 volts, or the Band Control solenoid was commanded off and the feedback voltage was from 2.45 -3.53 volts, or the Band Control solenoid was commanded on and the feedback voltage was more than 4.02 volts."

I believe this code pertains to the transfer case does it seem to work okay?

Have you checked all fuses? Here is a guide to help and the fuse locations:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Check out the diagrams (below). Please let us know what you find.

Cheers, Ken

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