P0706
Transmission Range Sensor Circuit Range/Performance
Encountering the engine check light code P0706 signifies an explicit mechanical or electrical operational breakdown categorized as "Transmission Range Sensor Circuit Range/Performance". Professional scanner tools usually flag this subsystem loop early on.
Driver's Summary
Storing code P0706 is your car's way of telling you something is wrong with the transmission range sensor circuit range/performance. In practice, this fault causes transmission shifts harshly, vehicle won't crank in park/neutral, incorrect gear indicator. Short trips are generally acceptable, but avoid high-load driving and get this inspected soon.
Symptoms
Transmission shifts harshly, vehicle won't crank in Park/Neutral, incorrect gear indicator
Common Causes
- Out of adjustment transmission range sensor
- Dirty or corroded sensor connector
- Failed transmission range sensor
- Damaged shift linkage
How to Fix
- 1 Adjust the transmission range sensor
- 2 Clean and grease electrical connector
- 3 Replace range sensor (neutral safety switch)
- 4 Inspect and repair shift cable/linkage
Technical Explanation
The ECM detects code P0706 by continuously monitoring the relevant sensor circuit against calibrated threshold values stored in its non-volatile memory. The TCM compares the ratio between input turbine speed sensor and output speed sensor readings against the expected gear ratio stored for each commanded gear position. A deviation greater than a few percent indicates clutch slippage, solenoid malfunction, or internal mechanical failure. The fault remains stored in memory even after the MIL is cleared; it becomes a confirmed DTC after failing two consecutive drive cycles, and the PCM logs a freeze frame record of the engine's exact operating state at the moment of detection.
Is It Safe to Drive?
Medium-severity fault: the car functions but not optimally. The out of adjustment transmission range sensor issue will not resolve itself and will cause measurable long-term wear. A repair in the $80–$350 range now avoids far higher costs later.
Mechanic's Pro Tip
The most common mistake with P0706 is replacing the sensor without verifying the reference voltage and ground integrity first. Use a scan tool to monitor the sensor's live output; a truly failed sensor shows a stuck, flatlined reading — a sensor that fluctuates but reads slightly off usually indicates a wiring or vacuum issue, not a dead sensor. Always spray electrical contact cleaner on the connector pins before condemning the sensor.
Sensor adjustment: $80 - $150; Sensor replacement: $150 - $350