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DTC codes / P07xx · Transmission / P07EB

P07EBTransmission Range Control A Circuit High

P07EB indicates that the transmission control module (TCM) has detected an abnormally high voltage on the 'A' circuit of the transmission range control system, which is responsible for determining the gear selector position. The TCM expects a specific voltage range from the range sensor or switch, and a high voltage reading suggests an open circuit, short to power, or a faulty sensor.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaTransmission

Symptoms you may notice

  • Illumination of the check engine light or transmission warning light
  • Transmission may default to a limp mode, limiting gear selection
  • Harsh or delayed shifting
  • Inability to select certain gears or the gear indicator may not match the actual selector position
  • Often no symptoms besides the warning light, especially if the fault is intermittent

Common causes, most likely first

  1. Faulty transmission range sensor (also known as neutral safety switch or gear position sensor)
  2. Damaged or corroded wiring harness or connector at the transmission range sensor
  3. Open circuit in the signal circuit (e.g., broken wire)
  4. Short to voltage on the signal circuit
  5. Poor electrical connection at the TCM
  6. Internal TCM fault (less common)

How to diagnose and fix it

  1. Verify the code with a scan tool and check for any related codes in the TCM and other modules
  2. Inspect the transmission range sensor connector and wiring for damage, corrosion, or loose pins
  3. Measure the voltage on the signal circuit at the sensor connector with the key on and compare to specifications
  4. Check for continuity and resistance in the wiring between the sensor and TCM to rule out open or short circuits
  5. Test the transmission range sensor with a multimeter according to the manufacturer's procedure
  6. If the sensor is faulty, replace it and clear the codes
  7. If wiring is faulty, repair or replace the affected section and retest

Range Sensor Circuit High Voltage Pitfalls

  • A high voltage code often results from an open circuit rather than a short, so a broken wire or disconnected connector is a common culprit that is frequently overlooked.
  • The transmission range sensor may be integrated into the transmission control module on some vehicles, making diagnosis more complex and potentially requiring module replacement.
  • Intermittent faults can be caused by worn ignition switch or selector mechanism, causing the sensor to misreport position; always check for mechanical wear.
  • Clearing the code without repairing the underlying issue will usually result in the code returning, so proper diagnosis is essential.
  • Related codes such as P07E8 or P07E9 may also be present, indicating other range sensor circuit faults, and should be addressed together.

Can I keep driving with P07EB?

If the vehicle is in limp mode or shifting erratically, avoid driving at high speeds or under heavy load and seek repair promptly. If only the warning light is on and the transmission behaves normally, you may drive cautiously to a repair shop, but do not ignore the issue as it may worsen.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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