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P0707 on 2009-2014 Ford F-150: Transmission Range Sensor Circuit Low Causes and Fixes

P0707 on a 2009-2014 F-150 typically indicates a problem with the Transmission Range Sensor (TRS) or its wiring, preventing the truck from knowing which gear it's in. This often results in a no-start condition or erratic shifting. The fix is usually replacing the sensor itself, which is a moderately difficult DIY job. On some models, especially later in this generation with the 6R80 transmission, the sensor is part of the internal lead frame, making the repair more complex.

21 minutes to read 2009-2014 Ford F-150

Most Likely Cause

Faulty Transmission Range Sensor (TRS) / Molded Lead Frame

Difficulty

2/5

Est. Time

3 hrs

DIY Doable?

🔧 Shop

Shop Labor

$150 – $800

Parts Price

$40 – $300

🚫 Do not drive — Continued driving is not recommended. The vehicle may not start, may shift erratically, or could enter a 'limp mode' with limited gear availability, creating an unsafe driving condition. In some cases, a faulty sensor signal can even cause an unexpected downshift to first gear at speed, which is a significant safety hazard.

Key Takeaways

P0707 on a 2009-2014 F-150 almost always points to a bad Transmission Range Sensor (TRS) or its wiring.
The most common symptom is a no-start condition, where the truck acts as if it's not in Park or Neutral.
On trucks with the 6R80 transmission (most common), the sensor is part of the internal molded lead frame, a more complex and expensive repair.
Before replacing parts, always check the wiring harness for damage and ensure the battery is fully charged, as low voltage can cause similar issues.
This is a safety-critical part; a faulty sensor can lead to unpredictable shifting or prevent the vehicle from starting, so it should be addressed promptly.

The trouble code P0707 means 'Transmission Range Sensor 'A' Circuit Low'. The Transmission Range Sensor (TRS), also known as a neutral safety switch, tells the truck's main computer, the Powertrain Control Module (PCM), what gear you have selected (Park, Reverse, Neutral, Drive, etc.). A 'Circuit Low' condition means the PCM is receiving a voltage signal from the sensor that is below the expected level (typically under 0.5V), or no voltage at all. This makes it difficult or impossible for the computer to confirm the gear selection, which can prevent the engine from starting as a safety measure.

What's Unique About the 2009-2014 Ford F-150

For the 2009-2014 F-150, the location and repair complexity of the Transmission Range Sensor depends on the specific transmission. On older 4-speed models, the sensor is an external, easily replaceable part on the side of the transmission case. However, most F-150s in this generation are equipped with the 6-speed 6R80 automatic transmission. On these models, the TRS is integrated into a component called the molded lead frame, which is located inside the transmission on top of the valve body. This makes the repair significantly more involved, requiring removal of the transmission pan and valve body. This internal lead frame is a known failure point.

Professional service recommended: While replacing an external sensor is possible for an experienced DIYer, diagnosis can be complex, involving electrical testing of circuits. Misdiagnosis could lead to replacing unnecessary parts. If the truck has the 6R80 transmission, the sensor is internal, requiring transmission pan and valve body removal, which is a job best left to a professional.

Symptoms You May Notice

Check Engine Light is on
Wrench light may be illuminated
Engine will not start, or only starts in Neutral.
No gear indicator light (e.g., 'P', 'R', 'N', 'D') on the dashboard.
Inability to shift out of Park
Erratic or harsh shifting between gears
Reverse lights do not turn on
Transmission enters 'limp mode' (stuck in one gear).
Decreased fuel economy.

⚠️ Don't Waste Money on the Wrong Fix

Replacing the starter motor when the vehicle won't crank, without first checking for transmission-related codes.
Assuming an internal transmission failure without diagnosing the external sensor and wiring first.
Replacing the battery due to a no-start condition without addressing the underlying P0707 code that is preventing the starter from engaging.

Most Likely Causes

Faulty Transmission Range Sensor (TRS) / Molded Lead Frame 🔴 High Probability → Shop Transmission Valve Body On 6R80-equipped trucks, the TRS is part of the internal molded lead frame, which is a common failure item. The internal electronics can fail, leading to low or no signal. On externally mounted sensors, exposure to the elements, moisture, and road salt makes it susceptible to corrosion and internal failure over time.
How to confirm: Test the sensor's voltage output at the electrical connector with a multimeter while an assistant moves the gear shifter. The voltage should change consistently with each gear position. A reading that is consistently low or absent indicates a failed sensor. For internal sensors, this test is performed at the main transmission harness connector.
Typical fix: For external sensors, replace the sensor. For internal sensors (6R80 transmission), replace the entire molded lead frame assembly inside the transmission. 🎬 Watch: Step-by-step 6R80 lead frame replacement tutorial
Est. part cost: $40-$90 (External), $150-$300 (Internal Lead Frame)
Wiring or Connector Issues 🟡 Medium Probability The wiring harness leading to the transmission can be damaged by road debris, heat from the exhaust, or corrosion at the connector pins. Rodent damage to the harness has also been reported by owners.
How to confirm: Visually inspect the wiring harness for any signs of chafing, breaks, or corrosion, particularly where it runs near the exhaust or suspension components. Perform a continuity test on the wires between the sensor connector and the PCM/TCM.
Typical fix: Repair the damaged section of wire or replace the connector pigtail.
Est. part cost: $15-$50
Misadjusted Transmission Range Sensor or Shift Linkage ⚪ Low Probability → Shop Transmission Assembly This primarily applies to externally mounted sensors. The linkage can become loose or the sensor can be knocked out of alignment, causing it to send incorrect signals. This is less common for the internal lead frame sensors.
How to confirm: Check the mechanical linkage from the shifter to the transmission for excessive play. When installing a new external sensor, ensure the alignment marks on the sensor and the transmission housing line up correctly when the transmission is in Neutral.
Typical fix: Adjust the shift linkage or properly align and tighten the Transmission Range Sensor.
Est. part cost: $0

Rare But Worth Checking

Faulty Powertrain Control Module (PCM) or Transmission Control Module (TCM): → Shop Transmission Assembly This is very rare and should only be considered after all other possibilities (sensor, wiring, alignment) have been exhaustively ruled out. A low battery can also cause communication errors with modules, so ensure the battery is fully charged and healthy.

Diagnosis Steps

Scan for Codes: Use an OBD-II scanner to confirm P0707 is the primary code. Note any other transmission-related codes like P0706 or P1702.
Check Battery Voltage: Ensure the vehicle's battery is fully charged (12.4V+). Low voltage can cause various electronic modules to set erroneous codes.
Check Fluid: Ensure the transmission fluid is at the correct level and in good condition. Low or dirty fluid can sometimes cause shifting issues, though it's less likely to cause this specific code.
Inspect Wiring: Visually inspect the wiring harness and connector going to the transmission. On 6R80 models, this is a large round connector on the passenger side. Look for corrosion, damage, or loose connections. Pay close attention to where the harness may rub against the frame or exhaust.
Test Sensor Voltage: With the key on and engine off, use a multimeter to back-probe the signal wire at the main transmission connector. Have a helper slowly move the gear selector through all positions. The voltage should change smoothly and correspond to each gear. A constant low or zero reading points to a bad sensor/lead frame or a wiring issue.
Check for Proper Alignment (External Sensors Only): If the sensor has been replaced previously, ensure it is correctly aligned. There are typically alignment marks that must line up when the transmission is in Neutral.
Test at the PCM/TCM: If the sensor and wiring appear good, the final step is to test the signal wire for continuity between the sensor connector and the Powertrain Control Module to rule out a break in the wire.

Parts You'll Likely Need

Transmission Range Sensor / Molded Lead Frame (OEM #XS4Z-7F293-AB (External Sensor example, may vary), Motorcraft SW-5713 (External Sensor example)) — This is the most common component to fail, triggering the P0707 code due to internal wear, moisture intrusion, or electronic failure within the lead frame assembly.
Trusted brands: Motorcraft, Dorman, Standard Motor Products (SMP)
OEM price range: $70-$250
Aftermarket price range: $40-$180

Related Codes That Often Appear With This One

P0706 — This code indicates 'Transmission Range Sensor Circuit Range/Performance'. It often appears with P0707 because the erratic or low signal can also be interpreted as a performance issue.
P0708 — This code for 'Transmission Range Sensor Circuit High' can appear intermittently if the sensor or wiring has a short that causes voltage to spike, in addition to the low voltage condition of P0707.
P1702 — Indicates a fault with the Transmission Range Sensor circuit, often logged alongside P0706 and P0707, 🎬 See: How to fix these common Ford transmission codes pointing towards a lead frame or wiring issue.

Technical Service Bulletins (TSBs) & Recalls

While no specific TSB for P0707 was found, Ford has issued multiple recalls and TSBs for the 6R80 transmission related to the lead frame and output speed sensor, which can cause similar symptoms like unexpected downshifts. Examples include NHTSA Campaign 19V-075 (19S07) for 2011-2013 models and 24V-444 (24S37) for 2014 models.

Platform-Specific Known Issues

6R80 Molded Lead Frame Failure: → Shop Transmission Valve Body For trucks with the 6R80 6-speed automatic, the Transmission Range Sensor is integrated into the molded lead frame assembly inside the transmission. These lead frames are a known point of failure, 🎬 Watch: Molded leadframe replacement walkthrough causing P0707 and other related codes. The repair requires dropping the transmission pan and valve body. There have been recalls and extended warranty programs for similar issues on these transmissions.

Mechanic-Grade Diagnostic Values

TR Sensor Power Supply Voltage at Transmission Connector C1575, Pin 12 (VT/GN wire) — expected: Greater than 9.5 volts with key on. Failure: Voltage less than 9.5 volts indicates an open in the power supply circuit from the PCM.
TR Sensor Signal Voltage at Transmission Connector C1575, Pin 4 (VT wire) — expected: Less than 4.8 volts with key on. Failure: Voltage greater than 4.8 volts suggests a short to power.
Transmission Range (TR) Sensor PWM Duty Cycle (Scan Tool PID: TR_DC) — expected: Park: 8.0-25.8%, Reverse: 30.5-39.31%, Neutral: 40.54-52.49%, Drive: 54.35-71.15%. Failure: A duty cycle percentage that is stuck low, does not match the selected gear, or is erratic.
Lead Frame to Valve Body Bolt Torque — expected: 6 Nm (53 lb-in). Failure: N/A
Valve Body to Transmission Case Bolt Torque — expected: 71 in-lbs (approx. 8 Nm). Failure: N/A

Scan Tool Commands That Help

Ford IDS (or equivalent high-level scanner): Solenoid Body Strategy Data Download / Relearn — After replacing the molded lead frame, a relearn procedure is often required to ensure the transmission control module recognizes the new component and performs optimal shifting. Failure to do this can result in harsh shifting even with a new part.
Ford IDS (or equivalent high-level scanner): Live Data PID Monitoring (TR_DC, TR_FREQ) — This is a primary diagnostic step. Observing the Transmission Range Duty Cycle (TR_DC) and Frequency (TR_FREQ) PIDs while moving the shifter can confirm if the sensor is sending a valid, changing signal to the PCM, or if it's stuck in a low state.

Wiring & Ground Locations

C1575 — The main external transmission vehicle harness connector, a large round connector on the passenger side of the 6R80 transmission case.. This is the primary test point for all signals going to and from the internal lead frame. Testing for power, ground, and signal voltage here can determine if the fault is internal to the transmission (bad lead frame) or external (wiring harness, PCM).
Pin 12 (Circuit LE111, VT/GN wire) at C1575 — At the main transmission harness connector.. This is the power supply from the PCM to the TR sensor. A voltage reading below 9.5V here points to a wiring issue between the PCM and the transmission, not a faulty lead frame.
Pin 4 (Circuit VET32, VT wire) at C1575 — At the main transmission harness connector.. This is one of the signal wires from the TR sensor back to the PCM. Checking for shorts or opens on this circuit is a key diagnostic step.
Pin 11 (Circuit RET24, BN/BU wire) at C1575 — At the main transmission harness connector.. This is the ground/return circuit for the TR sensor. High resistance or an open on this wire can cause low voltage readings.

Real Owner Repair Stories

f150forum.com (2016 Ford F-150 5.0L with 54,000 miles) — No-start condition, no gear indicator on the dash, yellow wrench light, codes P0706 & P0707 appeared instantly after clearing.
❌ Tried (didn't work) Clearing codes with a scanner., Disconnecting the battery for 30 minutes.
✅ What actually fixed it The dealership initially diagnosed a bad wiring harness. After further inspection, they determined the issue was the external harness connector that attaches to the lead frame, not the internal lead frame itself. This suggests a connection issue can mimic a complete lead frame failure.

OEM Part Supersession History

AL3Z-7G276-A, AL3Z-7G276-B → AL3Z-7G276-D — Updated design to improve reliability and address common failure points of the integrated sensors.
Heads up: While the lead frame for a 2012 may physically fit a 2015 model, there could be programming or compatibility differences. It is critical to use the correct part number for the specific model year and have it programmed if required.

Model Year Variations Within This Range

2009-2010 (approx.): Some early models in this generation, particularly those with the 4-speed 4R75E transmission, used an external Transmission Range Sensor mounted on the outside of the transmission case. This is a much simpler and cheaper repair than the internal lead frame.
2011-2014: Most trucks in these years use the 6-speed 6R80 transmission, where the TRS is integrated into the internal molded lead frame. This is a known high-failure part requiring removal of the valve body for replacement.

Diagnostic Flowchart

Start by confirming if P0707 is the primary code and checking for the 'Wrench' light. This code indicates a low input signal from the Transmission Range Sensor (TRS), which on most 2009-2014 F-150s is integrated into the internal 6R80 lead frame.

Check battery resting voltage. Is the battery reading at least 12.4V?

→ Recharge or replace the battery. Low voltage on the Ford F-150 platform frequently causes electronic modules to set erroneous P0707 codes.

Inspect the main transmission connector (large round plug on the passenger side). Is there evidence of corrosion, heat damage from the exhaust, or rodent chewing?

→ Repair the wiring harness or replace the connector pigtail. Ensure the harness is routed away from exhaust heat and suspension components.

Back-probe the TRS signal wire at the connector with a multimeter. Does the voltage change consistently as an assistant moves the shifter through all gears?

Is your F-150 equipped with the 6R80 6-speed transmission (standard on 2011-2014 and some 2009-2010 models)?

Check your VIN against NHTSA Campaign 19V-075 (19S07) or 24V-444 (24S37). Is your vehicle covered under a lead frame recall or extended warranty?

→ Contact a Ford dealer for a free replacement of the Molded Lead Frame assembly under the safety recall.

→ Replace the internal Molded Lead Frame assembly ($150-$300 parts). This requires dropping the transmission pan and valve body to access the integrated TRS.

→ Replace the externally mounted Transmission Range Sensor ($40-$90) and ensure proper alignment of the mechanical linkage.

→ The fault may be in the PCM/TCM. Perform a continuity test on the signal wire between the transmission connector and the PCM to rule out an internal wire break.

Does the dashboard gear indicator (P-R-N-D) match the physical shifter position, and do reverse lights work?