Pinpoint Test H: Paddle Shifters Are Inoperative Or Do Not Operate Properly
- Refer to Transmission Controls
for schematic and connector information.
Normal Operation and Fault Conditions
The paddle shift switches are integral to the steering wheel. The upshift/downshift feature becomes activated when the driver pulls the + paddle on the steering wheel. This feature allows the driver to upshift and downshift without removing their hands from the steering wheel. If a new switch is required, install a new paddle shift assembly.
Possible Sources
- Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
- Paddle shift switch
- TCM
- H1 CHECK THE GSM (GEAR SHIFT MODULE) FOR DIAGNOSTIC TROUBLE CODES (DTCS)NOTE: If a GSM self-test is carried out, the driver door must be fully closed and locked. A false P166B DTC may set if the driver door is not fully closed and locked.
- Using a diagnostic scan tool, carry out the GSM self-test.
Are any GSM diagnostic trouble codes (DTCs) present?
Yes RESOLVE all GSM diagnostic trouble codes (DTCs) first. No GO to H2 - H2 CHECK THE UPSHIFT AND DOWNSHIFT INPUTS TO THE TCM (TRANSMISSION CONTROL MODULE)
- Using a diagnostic scan tool, access the TCM and monitor PID SST_U and SST_D.
- Press and release the upshift paddle switch while observing PID SST_U.
- Press and release the downshift paddle switch while observing PID SST_D.
Does each PID agree with the corresponding switch as the switch is pressed and released?
Yes GO to H3 No GO to H4 - H3 CHECK THE OPERATION OF THE PADDLE SHIFT SYSTEM
- Road test the vehicle and use the paddle shifters to upshift and downshift the transmission.
Do the paddle shifters operate properly?
Yes The paddle shift system is working properly at this time. INSPECT harness connectors for loose terminals or corrosion that could cause an intermittent fault. No If any diagnostic trouble codes (DTCs) related to the transmission are present in the TCM or the GSM, RESOLVE those first. If no diagnostic trouble codes (DTCs) related to the transmission are present and the paddle shift switch concern continues, INSTALL a new TCM. After installing a new TCM, CARRY OUT the transmission strategy download. REFER to: Transmission Strategy Download . - H4 CHECK THE UPSHIFT PADDLE SWITCH
- Ignition OFF.
- Disconnect Upshift paddle switch C2428.
- Inspect the connector for damaged or pushed-out terminals.
- Measure the following while pressing and releasing the upshift paddle switch:
Positive Lead Measurement / Action Negative Lead Upshift paddle switch, component side, Pin 1 Upshift paddle switch, component side, Pin 2
Is the resistance less than 1.5 ohms with the upshift paddle switch pressed and greater than 10,000 ohms with the switch released?
Yes GO to H5 No INSTALL a new upshift paddle switch. REFER to: Upshift Paddle Switch . - H5 CHECK THE UPSHIFT SIGNAL CIRCUIT FOR VOLTAGE
- Ignition ON.
- Measure:
Positive Lead Measurement / Action Negative Lead C2428-1 Ground
Is the voltage greater than 11 volts?
Yes GO to H8 No GO to H6 - H6 CHECK THE UPSHIFT SIGNAL CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect TCM C1822.
- Inspect the connector for damaged or pushed-out terminals.
Is the resistance less than 3 ohms?
Yes GO to H7 No REFER to the OEM WIRING DIAGRAMS to identify and repair the open circuit. - H7 CHECK THE UPSHIFT SIGNAL CIRCUIT FOR A SHORT TO GROUND
- Measure:
Positive Lead Measurement / Action Negative Lead C1822-30 Ground
Is the resistance greater than 10,000 ohms?
Yes INSTALL a new TCM. After installing a new TCM, CARRY OUT the transmission strategy download. REFER to: Transmission Strategy Download . No REFER to the OEM WIRING DIAGRAMS to identify and repair the short to ground. - Measure:
- H8 CHECK THE DOWNSHIFT PADDLE SWITCH
- Ignition OFF.
- Disconnect Downshift paddle switch C2429.
- Inspect the connector for damaged or pushed-out terminals.
- Measure the following while pressing and releasing the downshift paddle switch:
Positive Lead Measurement / Action Negative Lead Downshift paddle switch, component side, Pin 4 Downshift paddle switch, component side, Pin 3
Is the resistance less than 1.5 ohms with the downshift paddle switch pressed and greater than 10,000 ohms with the switch released?
Yes GO to H9 No INSTALL a new downshift paddle switch. REFER to: Downshift Paddle Switch . - H9 CHECK THE DOWNSHIFT SIGNAL CIRCUIT FOR VOLTAGE
- Ignition ON.
- Measure:
Positive Lead Measurement / Action Negative Lead C2429-4 Ground
Is the voltage greater than 11 volts?
Yes GO to H12 No GO to H10 - H10 CHECK THE DOWNSHIFT SIGNAL CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect TCM C1822.
- Inspect the connector for damaged or pushed-out terminals.
Is the resistance less than 3 ohms?
Yes GO to H11 No REFER to the OEM WIRING DIAGRAMS to identify and repair the open circuit. - H11 CHECK THE DOWNSHIFT SIGNAL CIRCUIT FOR A SHORT TO GROUND
- Measure:
Positive Lead Measurement / Action Negative Lead C1822-33 Ground
Is the resistance greater than 10,000 ohms?
Yes INSTALL a new TCM. After installing a new TCM, CARRY OUT the transmission strategy download. REFER to: Transmission Strategy Download . No REFER to the OEM WIRING DIAGRAMS to identify and repair the short to ground. - Measure:
- H12 CHECK THE SIGNAL RETURN CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect TCM C1822.
- Disconnect Upshift paddle switch C2428 (if not already disconnected).
- Disconnect Downshift paddle switch C2429 (if not already disconnected).
- Inspect the connectors for damaged or pushed-out terminals.
Are the resistances less than 3 ohms?
Yes GO to H13 No REFER to the OEM WIRING DIAGRAMS to identify and repair an open circuit. - H13 CHECK THE SIGNAL RETURN CIRCUIT FOR A SHORT TO GROUND
- Measure:
Positive Lead Measurement / Action Negative Lead C1822-12 Ground
Is the resistance greater than 10,000 ohms?
Yes INSTALL a new TCM. After installing a new TCM, CARRY OUT the transmission strategy download. REFER to: Transmission Strategy Download . No REFER to the OEM WIRING DIAGRAMS to identify and repair a short to ground. - Measure: