24Car Repair
24car-repair.com
P1712
Turbine Shaft Speed Sensor No Signal
01
Understanding Code P1712: Turbine Shaft Speed Sensor Circuit
Code P1712 is a manufacturer-specific OBD-II diagnostic trouble code that indicates the Transmission Control Module (TCM) or Powertrain Control Module (PCM) is not receiving a valid signal from the Turbine Shaft Speed (TSS) sensor. This critical sensor monitors the rotational speed of the transmission’s input shaft, providing essential data for shift timing, torque converter clutch operation, and transmission line pressure control.
1.1
Sensor Function & Technical Specifications
Turbine Shaft Speed Sensor Technical Data
Sensor Type
Magnetic Pickup or Hall-Effect
Operating Voltage
5V Reference / 12V Power
Signal Output
AC Voltage (Magnetic) or Digital (Hall)
Resistance Range
200-1500 Ohms (varies by manufacturer)
02
Symptoms & Related Error Codes
2.1
Primary Symptoms of P1712
| Symptom | Description | Severity |
|---|---|---|
| Check Engine Light | Illuminated with P1712 stored in memory | High |
| Erratic Shifting | Random upshifts/downshifts, hunting for gears | High |
| Torque Converter Issues | Clutch not engaging, slippage, overheating | High |
| Limp Mode Activation | Transmission defaults to 2nd or 3rd gear only | Medium |
| Harsh Shifts | Jerky or abrupt gear changes | Medium |
| Poor Fuel Economy | Increased fuel consumption due to inefficient shifting | Low |
2.2
Related Diagnostic Trouble Codes
| Error Code | Description | Relationship to P1712 |
|---|---|---|
| P0715 | Input/Turbine Speed Sensor Circuit Malfunction | General circuit fault vs P1712’s specific “no signal” condition |
| P0717 | Input/Turbine Speed Sensor No Signal | Generic OBD-II equivalent of manufacturer-specific P1712 |
| P0720 | Output Speed Sensor Circuit Malfunction | Companion sensor – both needed for proper shift calculation |
| P0722 | Output Speed Sensor No Signal | Similar fault on output side; often diagnosed together |
| P0730 | Incorrect Gear Ratio | Result of P1712 – TCM detects wrong ratio without TSS data |
| P0700 | Transmission Control System Malfunction | Master code indicating transmission system fault |
03
Comprehensive Diagnostic Procedures
Safety First: Always disconnect the battery before working on electrical systems. Ensure vehicle is securely supported with jack stands when working underneath.
Diagnostic Flowchart for P1712
1
Initial Diagnosis & Code Verification
Connect OBD-II scanner, confirm P1712 is present and current. Clear codes and test drive to see if code returns immediately or under specific conditions (acceleration, certain gears, etc.).
2
Visual Inspection Phase
Locate TSS sensor (typically on transmission case near bellhousing). Inspect for physical damage, oil contamination, corrosion, and wiring harness condition up to 18 inches from connector.
3
Electrical Testing – Static
Disconnect sensor connector. Test with multimeter:
• Check resistance: 200-1500Ω (varies by vehicle)
• Check for short to ground: ∞ resistance to chassis
• Check wiring continuity to TCM
4
Dynamic Signal Testing
Reconnect sensor, back-probe signal wire. With vehicle safely raised, run engine in gear and observe AC voltage signal on oscilloscope or AC scale of multimeter. Signal should increase with wheel speed.
5
Final Diagnosis & Repair
Based on test results:
• Bad sensor → Replace TSS sensor
• Wiring fault → Repair harness
• No fault found → Check tone wheel and internal transmission components
3.1
Detailed Voltage & Resistance Specifications
Reference Voltage
5V ± 0.25V
Signal Voltage (AC)
0.5V – 100V (speed dependent)
Ground Circuit
＜ 0.5Ω to chassis ground
Insulation Resistance
＞ 1MΩ to ground
04
Technical Data & Repair Solutions
4.1
Vehicle-Specific Application Data
| Vehicle Make/Model | Transmission | Sensor Location | Resistance Specification |
|---|---|---|---|
| Ford F-150 (2004-2008) | 4R75E / 5R55S | Right side, near bellhousing | 250-750Ω |
| Chevrolet Silverado (2007-2013) | 4L60E / 6L80 | Top rear of transmission case | 190-250Ω |
| Toyota Camry (2002-2006) | U241E / U250E | Front left side, near oil pan | 560-680Ω |
| Dodge Ram (2005-2010) | 545RFE / 68RFE | Driver side, above oil pan | 200-400Ω |
| Nissan Altima (2002-2006) | RE4F04B | Rear extension housing | 215-275Ω |
Professional Tip: After replacing the TSS sensor, many vehicles require a transmission adaptive learning procedure. This typically involves driving through specific gear patterns to allow the TCM to recalibrate shift points.
4.2
Common Failure Patterns by Manufacturer
GM 4L60E Common Issue: The TSS sensor connector is prone to moisture intrusion and corrosion. Seal the connector with dielectric grease during repair to prevent recurrence.
Ford 5R55S Known Problem: Wiring harness chafing against transmission case near the main harness connector. Inspect for worn insulation and use abrasion-resistant conduit.
Categories:
