GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2007 🢒 HHR 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 DTC P0722 or P0723

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 P0722:  Output Speed Sensor Circuit Low Voltage

DTC P0723:  Output Speed Sensor Circuit Intermittent

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

OSS High Signal

P0722, P0723

P0722, P0723

P0722, P0723

P0722, P0723

OSS Low Signal

--

P0722, P0723

--

P0722, P0723

Typical Scan Tool Data

Scan Tool Parameter Data

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Operating Conditions: Drive vehicle, normal operating temperature

Parameter Normal Range: 100-7.000 RPM

Transmission OSS

0 RPM

0 RPM

0 RPM

Circuit/System Description

The output speed sensor (OSS) system is a pulse generator consisting of a speed sensor assembly, located in the case extension, and a toothed vehicle speed sensor reluctor wheel, which is pressed onto the final drive carrier assembly. As the vehicle drives forward, the vehicle speed sensor reluctor wheel rotates. This rotation produces a variable AC signal in the pickup coil that is proportional to vehicle speed. The transmission control module (TCM) uses this signal in order to calculate vehicle speed, shift timing, and gear ratios.

Conditions for Running the DTC
    • No ISS DTCs P0716 or P0717.
    • The engine speed is greater than 500 RPM for 5 seconds.
    • The engine torque is greater than 50 N·m (37 lb ft).
    • The transmission range is not PARK or NEUTRAL.

P0722

    • No TP sensor DTCs P0120 or P0220.
    • No OSS DTC P0723.
    • The calc. throttle position is 8 percent or more.
    • The input shaft speed is 1,000-5,000 RPM.
    • The TCC slip speed is -20 RPM or more.
    • The TFT is -40°C (-40°F) or more.

P0723

    • No 1-2 SS electrical DTC P0974.
    • The time since the last gear selector range change is 6 seconds or more.
    • The output speed is 1,000 RPM or greater for 2 seconds.
    • No transmission OSS rise 500 RPM or greater for 2 seconds.
    • The ISS changes 500 RPM or less for 2 seconds.

Conditions for Setting the DTC

P0722

The output shaft speed is 200 RPM or less for 4.5 seconds.

P0723

The output shaft speed drops greater than 1,200 RPM for 3.25 seconds.

Action Taken When the DTC Sets
    • DTCs P0722 and P0723 are type B DTCs.
    • The TCM commands maximum line pressure.
    • The TCM freezes transmission adaptive functions.
    • The TCM calculates output speed based on ISS, engine speed, and commanded gear.

Conditions for Clearing the DTC

DTCs P0722 and P0723 are type B DTCs.

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

    •  Automatic Transmission Inline 20-Way Connector End View
    •  Automatic Transmission Internal Connector End Views
    •  Automatic Transmission Related Connector End Views

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

    •  Scan Tool Data List
    •  Scan Tool Data Definitions
    •  Scan Tool Output Controls

DTC Type Reference

    •  Diagnostic Trouble Code (DTC) Type Definitions
    •  Diagnostic Trouble Code (DTC) List/Type

Special Tools

J 35616 GM Terminal Test Kit

Circuit/System Verification
  1. Raise and support the drive wheels.
  2. Start and idle the engine.
  3. Place the transmission in DRIVE.
  4. Monitor Transmission OSS on the scan tool.
  5. The Transmission OSS on the scan tool should be greater than 70 RPM.

Circuit/System Testing
  1. With the drive wheels supported, the engine running and the transmission in DRIVE ensure the Transmission OSS parameter on the scan tool is greater than 200 RPM.
    2. ⇒If the value is less than 200 RPM, disconnect the TCM connector and using the J 35616 connect the DMM between the OSS high signal and the OSS low signal circuits.
  2. Measure the resistance between the OSS high signal circuit and the OSS low signal circuit. The resistance should be between 1,650-3,180 ohms.
    3. ⇒If the value is greater than 3,180 ohms test the OSS high signal circuit and the OSS low signal circuit for an open.
    ⇒ If the value is less than 1,650 ohms test the OSS high signal and the OSS low signal circuits for a shorted together condition.
  3. Measure the resistance of the OSS high signal circuit to ground. The resistance should be greater than 10K ohms.
    4. ⇒If the value is less than 10K ohms, repair the short to ground.
  4. Measure the resistance between the ISS low signal circuit and ground. The resistance should be greater than 10K ohms.
    5. ⇒If the value is less than 10K ohms, repair the short to ground.
  5. Reconnect the TCM connector. Disconnect the OSS connector. Ignition ON, test the ISS high signal circuit for a short to voltage.
    6. ⇒If all circuits/connections test normal, test or replace the OSS.

Component Testing
  1. Verify the OSS resistance is between 1,650-3,180 ohms.
    2. ⇒If the resistance is not within the specified range, replace the OSS.
  2. Using the J 35616 connect the DMM between the OSS high signal and the OSS low signal circuits at the OSS connector. Raise and support the drive wheels. While rotating the drive wheels by hand ensure the AC voltage reading on the DMM is above 0.4 volts.
    3. ⇒If the AC voltage is not above 0.4 volts, replace the OSS.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

    • Ensure that the output speed is 500 RPM or greater for 3 seconds and does not change by 500 RPM or greater For 3 seconds.
    •  Vehicle Speed Sensor Replacement
    •  Control Module References for TCM replacement, setup, and programming