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DTC codes / P07xx · Transmission / P07E8

P07E8Transmission Range Control A Circuit/Open

P07E8 indicates that the transmission control module (TCM) has detected an open circuit or loss of continuity in the 'A' range control circuit, which is used to determine the transmission's operating range or gear selection. The TCM monitors voltage or current on this circuit and sets the code when the signal falls outside the expected range, often due to a wiring fault, a failed sensor, or a faulty range switch.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaTransmission

Symptoms you may notice

  • Illumination of the check engine light or transmission warning light, often with no other noticeable symptoms
  • Harsh or delayed shifting, or the transmission may default to a limp-home mode
  • Inability to select certain gears or ranges, such as no reverse or no overdrive
  • The gear indicator on the dashboard may flash or show incorrect range
  • The vehicle may start in the wrong gear or refuse to start if the range signal is used for starter enablement

Common causes, most likely first

  1. Damaged, corroded, or disconnected wiring or connector at the transmission range sensor or switch
  2. Faulty transmission range sensor (also called neutral safety switch or gear position sensor)
  3. Open circuit inside the transmission harness or a broken wire between the TCM and the range sensor
  4. Poor electrical connection at the TCM connector, including bent pins or corrosion
  5. Internal failure of the TCM (less common)
  6. Mechanical misalignment of the range sensor or selector mechanism

How to diagnose and fix it

  1. Inspect the transmission range sensor connector and wiring for signs of damage, corrosion, or loose pins; clean and secure as needed
  2. Check the sensor's electrical connector for proper voltage and ground signals using a multimeter, following the manufacturer's specification
  3. Test the range sensor's continuity or resistance across its pins while moving the selector through all ranges; replace if readings are out of spec
  4. Perform a wiggle test on the wiring harness while monitoring live data to identify intermittent opens
  5. Check for technical service bulletins (TSBs) or software updates for the TCM that may address false setting of this code
  6. If wiring and sensor are good, test the TCM's internal circuit or replace the TCM as a last resort

Don't overlook the range sensor connector

  • A common oversight is assuming the range sensor itself is faulty when the real problem is a corroded connector or chafed wire in the harness near the transmission, especially on vehicles exposed to road salt.
  • The code can be set intermittently by a loose selector cable or linkage that prevents the sensor from aligning properly with the selected range, mimicking an electrical open.
  • Some vehicles use the range signal for starter inhibition, so an open circuit can cause a no-crank condition that is misdiagnosed as a starter or battery problem.
  • After replacing the range sensor, a relearn or calibration procedure may be required for the TCM to recognize the new sensor's positions correctly.
  • This code is often stored alongside other transmission range codes (such as P0705 or P0706) when multiple circuits in the same sensor fail, so always check for related codes before replacing parts.

Can I keep driving with P07E8?

If the vehicle drives normally, you can drive it to a repair shop, but avoid aggressive acceleration or towing. If the transmission is in limp mode or shifts erratically, limit driving to a short distance at low speed to prevent further damage.

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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