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DIAGNOSTIC CODE INDEX DTC P0502 OR P0503 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 Descriptor DTC P0502 Vehicle Speed Sensor (VSS) Circuit Low Voltage DTC P0503 Vehicle Speed Sensor (VSS) Circuit Intermittent Diagnostic Fault Information Circuit/System Description DTC Description DTC P0502 or P0503 P0502: Vehicle Speed Sensor (VSS) Circuit Low Voltage P0503: Vehicle Speed Sensor (VSS) Circuit Intermittent DTC P0806 P0806: Clutch Pedal Position (CPP) Sensor Circuit Performance DTC P0807 or P0808 P0807: Clutch Pedal Position (CPP) Sensor Circuit Low Voltage P0808: Clutch Pedal Position (CPP) Sensor Circuit High Voltage DTC P080A P080A: Clutch Pedal Position (CPP) Not Learned Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance VSS Low Signal - P0502, P0503 - - VSS High Signal P0502, P0503 P0502, P0503 P0502, P0503 -
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Manual Transmission - Tremec 5-Speed (TZ0)
The vehicle speed information is provided to the engine control module (ECM) by the vehicle The instrument panel for speedometer and odometer operation The cruise control module Conditions for Running the DTC P0502 DTC P0120, P0220 or P0503 are not set. The TP sensor angle is more than 3.5 percent. The engine is running. The system voltage is 8-18V. TFT is more than -40°C (-40°F) The engine speed is 1,500-6,500 RPM. Vehicle speed is less than 200 km/h (124 mph). Engine torque is 68-8192 N.m (50-6,042 lb ft). The PTO is not active. P0503 The system voltage is 8-18V. The engine speed is 500-7,500 RPM. Transmission out speed change is less than 146 RPM for 2 seconds. The PTO is not active. The OSS is at least 292 RPM for 2 seconds. The OSS has not changed more than 146 RPM for 2 seconds. The 4WD range has not changed within 6 seconds. Conditions for Setting the DTC P0502 The transmission output speed is 58 RPM or less for 5 seconds.
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Manual Transmission - Tremec 5-Speed (TZ0)
P0503 The transmission output speed drops 351 RPMs in less than 3 seconds. Action Taken When the DTC Sets P0502 and P0503 are Type B DTCs. Conditions for Clearing the DTC P0502 and P0503 are Type B DTCs. Reference Information Schematic Reference PSD SIE TITLE Error: SIE linked to empty Cell ID 167881 Connector End View Reference Component Connector End Views Description and Operation Manual Transmission Description and Operation Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs DTC Type Reference Powertrain Diagnostic Trouble Code (DTC) Type Definitions Scan Tool Reference Control Module References Special Tools
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Manual Transmission - Tremec 5-Speed (TZ0)
J 35616 GM-Approved Terminal Test Kit Circuit/System Verification 1. Raise and support the drive wheels. 2. Start and idle the engine. 3. Place the transmission in second gear and release the clutch pedal. 4. Monitor VSS parameter on the scan tool. The VSS parameter should increase as the drive wheel speed increases. 5. Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records List. Circuit/System Testing 1. Disconnect the ECM harness connector X1. 2. Measure for 1,300-1,500 ohms at 25°C (77°F) between the VSS high signal circuit terminal 71 and the VSS low signal circuit terminal 72. If the value is greater than 1,500 ohms test the VSS high signal circuit and the VSS If the value is less than 1,300 ohms test the VSS high signal and the VSS low signal 3. Measure for more than 10 ohms of resistance between the VSS high signal circuit terminal 71 and ground. If the value is less than the specified range, repair the short to ground. 4. Measure for more than 10 ohms of resistance between the VSS low signal circuit terminal 72 and ground. If the value is less than the specified range, repair the short to ground. 5. Reconnect the ECM connector. Disconnect the VSS connector. 6. Ignition ON, test the VSS high signal circuit terminal B for a short to voltage. If all circuits/connections test normal, test or replace the VSS. Repair Procedures Perform the Diagnostic Repair Verification after completing the repair. Vehicle Speed Sensor Replacement
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Manual Transmission - Tremec 5-Speed (TZ0)
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