P0706 - Transmission Range Sensor (PRNDL) 'A' Range/Performance
System
Powertrain (Engine & Gearbox)
Technical Description
The control module has detected a fault in the Transmission Range Sensor (PRNDL) 'A' Range/Performance (P0706). The reported signal is electrically valid but disagrees with other operating parameters (RPM, load, or other sensors).
Multimeter Test Points & Nominal Values
| Test Point / Component | Measurement | Nominal Target Range | Test Condition |
|---|---|---|---|
| Transmission Range Sensor (PRNDL) 'A' Range/Performance – Coil Resistance | Resistance (Ω) | 3 - 30 Ω (typical) | Connector disconnected at 20°C |
| Transmission Range Sensor (PRNDL) 'A' Range/Performance – Duty Cycle | PWM (%) | 5 - 95 % (modulates with target) | Engine running, actuator in control |
| Transmission Range Sensor (PRNDL) 'A' Range/Performance – Supply Voltage | Voltage (V) | 11.8 - 14.4 V | Ignition ON at connector |
Connector disconnected at 20°C
Engine running, actuator in control
Ignition ON at connector
Oscilloscope Waveform Analysis
2 ms/div, 20 V/divPossible Causes
Transmission Range Sensor (PRNDL) 'A' Range/Performance is electrically operational but performing outside calibrated tolerance
Channel A:Verify dedicated wiring pins and signal pair for circuit A against the schematic.
Chafed or pinched wiring harness along the signal path to Transmission Range Sensor (PRNDL) 'A' Range/Performance
Internal mechanical wear or carbon deposits inside Transmission Range Sensor (PRNDL) 'A' Range/Performance
Defective internal output driver or reference circuit in the control module for Transmission Range Sensor (PRNDL) 'A' Range/Performance
Symptoms
4
Recommended Solution
Compare signal voltage and resistance between circuit A and companion circuit B at module connector.
Log component live data across varying load points and verify plausibility against engine target model.
Verify loaded supply voltage and harness terminal pins at Transmission Range Sensor (PRNDL) 'A' Range/Performance.
Check circuit continuity and ground-side voltage drop (< 0.05 V) for Transmission Range Sensor (PRNDL) 'A' Range/Performance.
Check supply and the low-side driver at the ECM connector. Replace the actuator or repair the circuit based on the readings.
Mechanic's Tip
Use the scan-tool output test with the scope on the control side at the same time. If duty changes but the actuator does not move, the valve is stuck — not the electrical fault you were chasing.