P0707

Code

Generic P — Powertrain

Transmission Range Sensor A Circuit Low

Brand: Generic

Type: P — Powertrain

Views: UK: 35 EN: 52 RU: 57

AI status

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Page language: EN

Causes

Short to ground in TR sensor A wiring
Open or high-resistance wiring/connectors between sensor and PCM
Corroded, loose, or damaged connector at the sensor or PCM
Faulty transmission range (park/neutral) position sensor or switch
Poor ground or lost reference voltage from PCM
Incorrectly adjusted or mechanically damaged shift selector

Symptoms

Check Engine Light (MIL) illuminated and DTC P0707 stored
Gear indicator may show incorrect position or be erratic
Engine may not crank (starter inhibited) because PCM thinks vehicle not in Park/Neutral
Transmission may enter limp/ failsafe mode or exhibit abnormal shifting
Intermittent loss of gear selection detection

What to check

Scan for stored/related DTCs and review freeze-frame/live data (PRNDL status, sensor voltage)
Visual inspection of the range sensor connector and wiring for corrosion, damage, or pin pushed out
Backprobe sensor signal, reference, and ground circuits with key ON (engine OFF) and observe voltages
Check continuity and resistance between sensor terminals and PCM connector pins
Verify PCM provides the expected reference voltage (typically ~5 V) and a good ground
Wiggle test wiring while monitoring signal for intermittent faults

Signal parameters

Reference voltage: typically ~5.0 V from PCM to range sensor (key ON, engine OFF)
Signal voltage: varies by gear; a 'low' fault is usually detected when signal is below ~0.3–0.5 V (vehicle-dependent)
Open circuit: very high resistance or infinite between sensor signal and PCM
Short to ground: continuity from signal circuit to chassis ground (near 0 Ω)
Short to battery: presence of battery voltage on signal when it should be low indicates short/high

Diagnostic algorithm

Retrieve P0707 and any other transmission/PRNDL codes; record freeze frame and live data.
Verify battery voltage is stable; low battery can cause spurious sensor readings.
Perform visual inspection of transmission range sensor connector and harness for damage or corrosion.
Backprobe the sensor with key ON (engine OFF): check reference (~5V), signal voltage, and ground. Note values in each gear position while moving shifter through PRNDL.
If reference or ground is missing, trace wiring back to PCM and repair the supply/ground circuit (check fuses/relays as applicable).
If reference and ground are present but signal is low, disconnect the sensor and measure signal circuit to chassis ground and to PCM: check for short to ground or open circuit.
Perform continuity/resistance check between sensor connector pin and PCM pin. Repair any opens/shorts found in harness or connector.
If wiring and connectors test good, replace the transmission range sensor/switch, then clear codes.
Test drive and re-check live data and DTC status. If fault persists after sensor replacement and wiring repairs, consider PCM diagnosis or replacement.
After repair, verify proper gear selection indication and starter enable/disable function as applicable.

Likely causes

Water-corroded connector at the transmission range sensor causing low signal
Wiring chafed and shorted to chassis ground
Broken or intermittent wires in the harness between the sensor and PCM
Failed TR sensor/switch stuck in low-output state
Missing/weak 5V reference or ground at the sensor

Fault status

⚠️ Status

Transmission Range Sensor A Circuit Low — PCM detected a low-voltage/ground condition on the Transmission Range (PRNDL) Sensor A circuit. Inspect wiring, connector, sensor, and related reference/ground circuits.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours