DTC P0601-P0604 or P062F. Chevrolet HHR 2006

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2006 🢒 HHR 🢒 Vehicle Control Systems 🢒 Vehicle DTC Information 🢒 DTC P0601-P0604 or P062F

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 P0601: Transmission Control Module (TCM) Read Only Memory (ROM)

DTC P0602: Transmission Control Module (TCM) Not Programmed

DTC P0603: Transmission Control Module (TCM) Long Term Memory Reset

DTC P0604: Transmission Control Module (TCM) Random Access Memory (RAM)

DTC P062F: Transmission Control Module (TCM) Long Term Memory Performance

Circuit/System Description

The internal fault detection is handled inside the transmission control module (TCM). No external circuits are involved.

Conditions for Running the DTC

The TCM runs the program to detect an internal fault when the engine is running. The only requirements are voltage and ground. This program runs even if the voltage is out of the valid operating range.

Conditions for Setting the DTC

The TCM has detected an internal malfunction.

Action Taken When the DTC Sets

•	DTCs P0601, P0602, P0603, P0604, and P062F are Type A DTCs.

•	The TCM commands maximum line pressure.

•	The TCM forces the torque converter clutch (TCC) OFF.

•	The TCM inhibits TCC engagement.

•	The TCM freezes transmission adaptive functions.

DTCs P0601, P0603, P0604, and P062F

The TCM commands a soft landing to 2nd gear.

P0602

The TCM commands an immediate landing to 2nd gear.

⇒	If DTC P0602 is set, program the TCM.

⇒	If DTC P0602 is not set, replace the TCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for TCM replacement, setup, and programming.

Diagnostic Instructions

DTC Descriptors