NEED HELP Potential reasons for code's?

Hearnrobert2828

Original poster
Member
Dec 8, 2019
8
Knoxville
'07 TB LS 4.2L
C0161- Antilock break system, break switch circuit
C0455- steering wheel angle sensor performance
P1400- cold start emission reduction control system
P0506- idle air control system revolutions per min. Lower than expected.
Any help would be greatly appreciated. Thanks!
 
Last edited:

mrrsm

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Supporting Donor
Member
Oct 22, 2015
7,642
Tampa Bay Area
C0455- steering wheel angle sensor performance



C0161- Anti-lock Break System, break switch circuit

If you can see these CXXXX Codes on your scanner...it is probably High End one like a “GYMKO” Tech 2 or an Autel Scanner. As such you can perform an ABS Actuation Test as per the videos available in the “Stickyed” Tech 2- Additional Tech 2 Resources Thread...BUT FIRST… You must perform a proper Brake Bleed that flushes the crap out of all the lines and the Master Brake Cylinder:

Tech 2 ABS Brake Bleed Procedures:


P0506- idle air control system revolutions per min. Lower than expected.
P1400- cold start emission reduction control system.


Work the P0506 Problem first...and the P1400 Code will probably go away. Pursue a Good Cleaning by First removing the Throttle Body from the Intake Manifold and using a Non-Destructive Cleaning Solvent that will not invade and damage the TB-IAC Internal Gear Controls. Go EZ with excessive pressure when using your fingers to apply pressure to the Butterfly TB Plate. Clean and align the Plastic Grommet Gasket and go EZ on tightening down the (4) TB to IM Bolts .

From a Famous 'Wu-Tang Clan GMTN Guru'… @MAY03LT on How to Perform a THOROUGH Throttle Body Cleaning:

 
Last edited:

TJBaker57

Member
Aug 16, 2015
2,897
Colorado
C0161- Antilock break system, break switch circuit
The brake switch on these trucks is actually 3 separate sets of contacts, 2 are normally closed and 1 is normally open. The normally open contacts are for the stop lamps and the others are for TCC and Cruise Release. I have had success cleaning the internal switch contacts but the clip that holds it in is a pita to remove so for the price of a new switch you might want to go that route.
 

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