Code
P0707
GWM
P — Powertrain
- Low Transmission Sensor
AI status
Completed
Completed
100%
Causes
- Faulty transmission fluid pressure sensor/switch (open/short or internal failure)
- Wiring short to ground, open circuit, or poor connector at sensor or TCM
- Low or contaminated transmission fluid level reducing hydraulic pressure
- Clogged filter or restricted hydraulic passages
- Weak or failing transmission oil pump or internal valve/body problem
- Faulty TCM or incorrect software/calibration
Symptoms
- Transmission limp mode or reduced shift functionality
- Check Engine/Transmission warning lamp illuminated
- Harsh, delayed, or incorrect shifting
- Loss of drive or inability to shift into gears
- Stored transmission-related trouble codes and abnormal pressure PID values on scan tool
What to check
- Read and record freeze-frame data and all stored transmission/engine codes
- Check transmission fluid level and condition (color, smell, debris)
- Visually inspect sensor connector and wiring for corrosion, damage, or pin push-out
- Use a scan tool to monitor transmission pressure PID (if available) and compare to expected behavior
- Check battery voltage and ground integrity before electrical tests
- Perform wiggle tests on wiring while observing live data for intermittent faults
Signal parameters
- Typical sensor circuits use a 5 V reference and return a signal in the ~0.5–4.5 V range proportional to pressure (varies by design)
- A low-circuit condition is indicated by signal voltage near 0 V or well below expected idle value
- Open circuit may show no signal or high diagnostic resistance; short-to-ground pulls the signal toward 0 V
- On switch-type sensors, closed = ground/low, open = reference or pull-up; check OEM specification
Diagnostic algorithm
- Connect a capable scan tool, record all codes and freeze-frame data, then clear codes and attempt to re-create the failure while monitoring live PIDs.
- Visually inspect the pressure sensor connector and wiring for damage, corrosion, pin push-out or water ingress; repair any obvious faults.
- Verify battery voltage and good chassis/engine grounds; low supply voltage can cause false low readings.
- Backprobe the sensor connector: verify reference voltage (typically ~5 V), ground continuity, and signal voltage while key on and with engine running; note if signal is stuck low.
- If the signal is low or erratic, check continuity between the sensor ground/signal and the TCM connector for shorts to chassis ground or to power. Wiggle harness and retest for intermittent faults.
- If electrical tests are within spec but the signal indicates low pressure, perform a mechanical transmission line pressure test with a calibrated gauge to confirm actual hydraulic pressure.
- If mechanical pressure is normal but sensor signal is incorrect, replace the pressure sensor/switch and retest. Use OEM sensor and torque connector per spec.
- If mechanical pressure is low, investigate filter, fluid condition, pump, valve body and internal components—these require deeper transmission diagnosis/repair.
- After repairs, clear codes and perform road test while monitoring live data to confirm the fault does not return. Check for required TCM reprogramming or adaptations if specified by manufacturer.
Likely causes
- Bad sensor or switch
- Damaged connector or corroded pins at the sensor
- Wire shorted to ground between sensor and TCM
- Low/old transmission fluid or clogged filter
- Internal transmission pressure/pump failure (less common)
Fault status
Status
P0707 — Transmission pressure sensor/switch circuit low. TCM senses a low or pulled-to-ground signal from the transmission pressure sensor; may cause limp-in mode and incorrect shifting.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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