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Tahoe / Yukon Service Manual

DTC P17F5-P17F7 or P17FA-P17FC

Automatic Transmission - 10L80 MHS MQC | Diagnostic Information and Procedures | Document ID: 5224801 Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions DTC Descriptor DTC P17F5 Transmission Park Valve Position Sensor Circuit DTC P17F6 Transmission Park Valve Position Sensor Circuit Low DTC P17F7 Transmission Park Valve Position Sensor Circuit High DTC P17FA Transmission Park Valve Position Sensor 2 Circuit DTC P17FB Transmission Park Valve Position Sensor 2 Circuit Low DTC P17FC Transmission Park Valve Position Sensor 2 Circuit High Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performanc
9 V Reference P17F6, P17FB P17F6, P17FB — —
Signal — Sensor 1 P17F6 P17F6 P17F7 —
Signal — Sensor 2 P17FB P17FB P17FC —

Typical Scan Tool Data Transmission Park Valve Position Sensor / Transmission Park Valve Position Sensor 2

Circuit Short to Ground Open Short to Voltage
Operating Conditions: Engine = Running Parameter Normal Range: 0.7 to 2.2 V
9 V Reference 0 V 0 V —
Signal — Sensor 0 V 0 V 4.8 to 5.0 V
Signal — Sensor 2 0 V 0 V 4.8 to 5.0 V

Circuit/System Description

Circuit Description
9 V Reference Regulated voltage supplied by the control module.
Signal The control module input circuit has an internal resistance connected to ground.
Component Description
B316 Transmission Park Valve Position Switch The switch contains 2 hall-effect sensors and additional electronics. It detects the strength of the magnetic field caused by a magnet that is mounted to the park release lever. When the strength changes, the sensors change the amount of current they consume.
K71 Transmission Control Module The control module contains a microprocessor used to process input data to control outputs. The control module receives information from a variety of sensors, switches and serial data information from other control modules. This information is used to control a combination of solenoid valves to obtain the correct line pressure, gear ratio and torque converter clutch operation.

Conditions for Running the DTC Ignition and Start Signal = 9 to 32 V Ignition and Start Switch Signal = On Frequency the DTC runs = Continuously — After the running conditions are met — For greater than 1 s Conditions for Setting the DTC P17F5 Transmission Park Valve Position Sensor = 0.4 to 1.5 V — For greater than 1 s P17F6 Transmission Park Valve Position Sensor = Less than 0.4 V — For greater than 1 s P17F7 Transmission Park Valve Position Sensor = Greater than 2.5 V — For greater than 1 s P17FA Transmission Park Valve Position Sensor 2 = 0.4 to 1.5 V — For greater than 1 s P17FB Transmission Park Valve Position Sensor 2 = Less than 0.4 V — For greater than 1 s P17FC Transmission Park Valve Position Sensor 2 = Greater than 2.5 V — For greater than 1 s Actions Taken When the DTC Sets DTCs listed in the DTC Descriptor category = Type A DTC Autostart/Autostop = Disabled Conditions for Clearing the DTC DTCs listed in the DTC Descriptor category = Type A DTC Reference Information Schematic Reference Automatic Transmission Controls Schematics Connector End View Reference Master Electrical Component List 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 Circuit/System Verification

  1. Engine » Running
  2. Transmission Range » Park Verify the scan tool parameter: { P17F5, P17F6, P17F7 } Transmission Park Valve Position Sensor = 0.6 to 1.0 V { P17FA, P17FB, P17FC } Transmission Park Valve Position Sensor 2 = 0.6 to 1.0 V ⇒ If not between 0.6 and 1.0 V Refer to: Circuit/System Testing ⇓ If between 0.6 and 1.0 V
  3. Transmission Range » Reverse Gear Verify the scan tool parameter: { P17F5, P17F6, P17F7 } Transmission Park Valve Position Sensor = 1.7 to 2.1 V { P17FA, P17FB, P17FC } Transmission Park Valve Position Sensor 2 = 1.7 to 2.1 V ⇒ If not between 1.7 and 2.1 V Refer to: Circuit/System Testing ⇓ If between 1.7 and 2.1 V
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data. Verify the DTC does not set. ⇒ If the DTC sets Refer to: Circuit/System Testing ⇓ If the DTC is not set
  5. All OK. Circuit/System Testing
  6. Ignition/Vehicle » Off
  1. Disconnect the electrical connector: X1 @ T12 Automatic Transmission
  2. Ignition » On / Vehicle » In Service Mode
  3. Test for 8.6 to 9.2 V between the test points: 9 V Reference circuit terminal 7 @ T12 Automatic Transmission (harness side) & Ground ⇒ If less than 8.6 V 4.1. Disconnect the electrical connector: K71 Transmission Control Module 4.2. Test for infinite resistance between the test points: 9 V Reference circuit terminal 7 @ T12  Automatic Transmission (harness side) & Ground ⇒ If less than infinite resistance » Repair the short to ground on the circuit. ⇓ If infinite resistance 4.3. Test for less than 2 Ω between the test points: 9 V Reference circuit terminal 7 @ T12  Automatic Transmission (harness side) & The other end of the circuit ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Replace the component: K71 Transmission Control Module ⇒ If greater than 9.2 V 4.1. Ignition/Vehicle » Off 4.2. Disconnect the electrical connector: K71 Transmission Control Module 4.3. Ignition » On / Vehicle » In Service Mode 4.4. Test for less than 1 V between the test points: 9 V Reference circuit terminal 7 @ T12  Automatic Transmission (harness side) & Ground ⇒ If 1 V or greater » Repair the short to voltage on the circuit. ⇒ If less than 1 V » Replace the component: K71 Transmission Control Module ⇓ If between 8.6 and 9.2 V
  4. Verify the scan tool parameter: { P17F5, P17F6, P17F7 } Transmission Park Valve Position Sensor = Less than 0.4 V { P17FA, P17FB, P17FC } Transmission Park Valve Position Sensor 2 = Less than 0.4 V ⇒ If 0.4 V or greater 5.1. Ignition/Vehicle » Off 5.2. Disconnect the electrical connector: K71 Transmission Control Module 5.3. Ignition » On / Vehicle » In Service Mode 5.4. Test for less than 0.4 V between the test points: { P17F5, P17F6, P17F7 } Signal circuit terminal 5 @ T12 Automatic Transmission (harness side) & Ground { P17FA, P17FB, P17FC } Signal circuit terminal 6 @ T12 Automatic Transmission (harness side) & Ground ⇒ If 0.4 V or greater » Repair the short to voltage on the circuit. ⇒ If less than 0.4 V » Replace the component: K71 Transmission Control Module ⇓ If less than 0.4 V
  5. Connect a 3 A fused jumper wire between the test points: { P17F5, P17F6, P17F7 } Signal circuit terminal 5 & 9 V Reference circuit terminal 7 { P17FA, P17FB, P17FC } Signal circuit terminal 6 & 9 V Reference circuit terminal 7
  6. Verify the scan tool parameter: { P17F5, P17F6, P17F7 } Transmission Park Valve Position Sensor = Greater than 4.8 V { P17FA, P17FB, P17FC } Transmission Park Valve Position Sensor 2 = Greater than 4.8  V ⇒ If less than 4.8 V 7.1. Ignition/Vehicle » Off & Remove » Jumper wire(s) 7.2. Disconnect the electrical connector: K71 Transmission Control Module 7.3. Test for infinite resistance between the test points: { P17F5, P17F6, P17F7 } Signal circuit terminal 5 @ Component harness & Ground { P17FA, P17FB, P17FC } Signal circuit terminal 6 @ Component harness & Ground ⇒ If less than infinite resistance » Repair the short to ground on the circuit. ⇓ If infinite resistance 7.4. Test for less than 2 Ω between the test points: { P17F5, P17F6, P17F7 } Signal circuit terminal 5 @ Component harness & The other end of the circuit @ Control module harness { P17FA, P17FB, P17FC } Signal circuit terminal 6 @ Component harness & The other end of the circuit @ Control module harness ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Replace the component: K71 Transmission Control Module ⇓ If greater than 4.8 V
  7. Ignition/Vehicle » Off & Remove » Jumper wire(s)
  8. Remove the component: Automatic Transmission Fluid Pan
  9. Connect the electrical connector: X1 @ T12 Automatic Transmission
  10. Disconnect the electrical connector: B316 Transmission Park Valve Position Switch
  11. Ignition » On / Vehicle » In Service Mode
  12. Verify the scan tool parameter: { P17F5, P17F6, P17F7 } Transmission Park Valve Position Sensor = Less than 0.4 V { P17FA, P17FB, P17FC } Transmission Park Valve Position Sensor 2 = Less than 0.4 V ⇒ If 0.4 V or greater Replace the component: Automatic Transmission Wiring Harness
  13. Test for 8.6 to 9.2 V between the test points: 9 V Reference circuit terminal 2 & Ground ⇒ If not between 8.6 and 9.2 V Replace the component: Automatic Transmission Wiring Harness ⇓ If between 8.6 and 9.2 V
  14. Connect a 3 A fused jumper wire between the test points: { P17F5, P17F6, P17F7 } Signal circuit terminal 3 & 9 V Reference circuit terminal 2 { P17FA, P17FB, P17FC } Signal circuit terminal 4 & 9 V Reference circuit terminal 2
  15. Verify the scan tool parameter: { P17F5, P17F6, P17F7 } Transmission Park Valve Position Sensor = Greater than 4.8 V { P17FA, P17FB, P17FC } Transmission Park Valve Position Sensor 2 = Greater than 4.8  V ⇒ If less than 4.8 V Replace the component: Automatic Transmission Wiring Harness ⇓ If 4.8 V or greater
  16. Test or replace the component: B316 Transmission Park Valve Position Switch Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Control Valve Assembly Disassemble / Control Valve Assembly Assemble — B316  Transmission Park Valve Position Switch Automatic Transmission Fluid, Fluid Pan and/or Filter Replacement For control module replacement, programming, and setup refer to: Control Module References