Gear does not shift!
Thread Starter
Instructor
Joined: Feb 2015
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Gear does not shift!
Supercharged A6 c6 2008.
Suddenly gear stuck in 2nd and won't shift up or down. Switched off and on and problem gone but code is appearing. What does this mean! On inspection got this:
Suddenly gear stuck in 2nd and won't shift up or down. Switched off and on and problem gone but code is appearing. What does this mean! On inspection got this:
Retired & lovin' it!
Joined: Mar 2005
Posts: 4,475
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From: Jackson NJ
Did a "Google search" on the code & came up with the following:
(the full document is at "http://www.ls2.com/boggs/dtcs/DTC%20P2723%20or%20P2724.htm"
DTC P2723 or P2724
Diagnostic Instructions
•
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
•
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
•
Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC P2723: Clutch Pressure Control (PC) Solenoid 5 - Stuck Off
DTC P2724: Clutch Pressure Control (PC) Solenoid 5 - Stuck On
Diagnostic Fault Information
The following fault table will help determine if a hydraulic circuit or an incorrect position of a valve train component affects the transmission operation.
Component
Cause
DTCs
1-2-3-4 and 3-5-R Clutch Housing Assembly
1-2-3-4 clutch backing plate retaining ring not seated, causing the piston to over-travel and cut 1-2-3-4 clutch piston seal
P2723
Lower Control Valve Body Assembly
Clutch select valve 3 stuck OFF - debris, sediment, binding or scored bore
P2723
Upper Control Valve Body Assembly
1-2-3-4 Clutch regulator valve stuck - debris, sediment, binding or scored bore
P2723
Fluid Pump Cover Assembly
•
Fluid pump cover pump damage or debris between torque converter housing causing pump slide damage
•
Fluid pump cover vanes and fluid pump rotor broken
P2723
Circuit/System Description
The clutch pressure control (PC) solenoid 5 is integral to the control solenoid (w/body and TCM) valve assembly and has no serviceable parts. The PC solenoid 5 is a normally high-pressure control solenoid which provides fluid pressure to the 1-2-3-4 clutch regulator valve. The TCM controls the solenoid pressure by regulating the exhaust fluid. When the TCM commands the solenoid off, the exhausting fluid is stopped and the 1-2-3-4 pressure is high. When commanded on, the clutch PC solenoid 5 regulates the amount of exhausting transmission fluid. Solenoid power is supplied by the TCM through a high side driver (HSD). The HSD protects the circuits and components that the TCM powers. Should the circuit overload the driver will shutdown. After the overload is removed the HSD reset.
(the full document is at "http://www.ls2.com/boggs/dtcs/DTC%20P2723%20or%20P2724.htm"
DTC P2723 or P2724
Diagnostic Instructions
•
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
•
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
•
Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC P2723: Clutch Pressure Control (PC) Solenoid 5 - Stuck Off
DTC P2724: Clutch Pressure Control (PC) Solenoid 5 - Stuck On
Diagnostic Fault Information
The following fault table will help determine if a hydraulic circuit or an incorrect position of a valve train component affects the transmission operation.
Component
Cause
DTCs
1-2-3-4 and 3-5-R Clutch Housing Assembly
1-2-3-4 clutch backing plate retaining ring not seated, causing the piston to over-travel and cut 1-2-3-4 clutch piston seal
P2723
Lower Control Valve Body Assembly
Clutch select valve 3 stuck OFF - debris, sediment, binding or scored bore
P2723
Upper Control Valve Body Assembly
1-2-3-4 Clutch regulator valve stuck - debris, sediment, binding or scored bore
P2723
Fluid Pump Cover Assembly
•
Fluid pump cover pump damage or debris between torque converter housing causing pump slide damage
•
Fluid pump cover vanes and fluid pump rotor broken
P2723
Circuit/System Description
The clutch pressure control (PC) solenoid 5 is integral to the control solenoid (w/body and TCM) valve assembly and has no serviceable parts. The PC solenoid 5 is a normally high-pressure control solenoid which provides fluid pressure to the 1-2-3-4 clutch regulator valve. The TCM controls the solenoid pressure by regulating the exhaust fluid. When the TCM commands the solenoid off, the exhausting fluid is stopped and the 1-2-3-4 pressure is high. When commanded on, the clutch PC solenoid 5 regulates the amount of exhausting transmission fluid. Solenoid power is supplied by the TCM through a high side driver (HSD). The HSD protects the circuits and components that the TCM powers. Should the circuit overload the driver will shutdown. After the overload is removed the HSD reset.
Thread Starter
Instructor
Joined: Feb 2015
Posts: 143
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Problem is back now.
Error is p2724
Solenoid valve 5 stuck on. It goes into limp mode. I changed the "solenoid pack" and filter but came back in a day time.
Could this be mechanical or is that pure electrical?
Error is p2724
Solenoid valve 5 stuck on. It goes into limp mode. I changed the "solenoid pack" and filter but came back in a day time.
Could this be mechanical or is that pure electrical?
Last edited by VetteArts; Jun 30, 2016 at 07:49 PM.
