P2729
DTC P2729
Circuit Description
The pressure control solenoid 1 (PCS1) is a pressure proportional to current (PCC) solenoid used to control on-coming, off-going and holding pressure to any 1 of the 5 clutches. The transmission control module (TCM) provides voltage to the main modulation (MAIN MOD), torque converter clutch (TCC) and PCS1 through a separate solid-state device called high side driver 1 (HSD1). The TCM regulates the amount of current to the PCS1 by switching the low side driver ON and OFF.
DTC P2729 is a type A DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P2729 Pressure Control Solenoid 1 (PCS1) Control Circuit Low (A)
Conditions for Running the DTC
^ DTC P0658 and P0659 are not active.
^ The components are powered and ignition voltage is greater than 9.0 volts and less than 18 volts.
^ Engine speed is greater than 200 RPM and less than 7,500 RPM for 5 seconds.
^ TCM initialization is in process.
^ Engine crank time is not extended.
Conditions for Setting the DTC
DTC P2729 sets when the TCM detects a short to ground on the PCS1 circuit for greater than 2 seconds.
Action Taken When the DTC Sets
^ The TCM illuminates the malfunction indicator lamp (MIL).
^ If the failure occurs while in a forward range, a shift to 1st, 3rd or 5th range is made.
^ While diagnostic response is active, if the shift selector is moved to NEUTRAL, the transmission will shift to NEUTRAL. If the shift selector is moved to REVERSE, the transmission will shift to REVERSE. If the shift selector is moved to a forward range or to REVERSE and the transmission is compromised by overspeeding or direction change, the transmission will shift to NEUTRAL.
^ DTC P2729 is stored in TCM history.
^ The TCM inhibits MAIN MOD.
^ The TCM inhibits torque converter clutch (TCC) engagement.
Conditions for Clearing the MIL/DTC
A scan tool can clear the code from TCM history. The TCM automatically clears the DTC from TCM history if the vehicle completes 40 Warm-up cycles without failure.
Diagnostic Aids
^ Inspect the wiring for poor electrical connections at the TCM. Inspect for the following conditions:
^ A bent terminal
^ A backed-out terminal
^ A damaged terminal
^ Poor terminal tension
^ A chafed wire
^ A broken wire inside the insulation
^ When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.
^ You may have to drive the vehicle in order to experience a condition.
