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DTC codes / P07xx · Transmission / P07C5

P07C5Intermediate Shaft Speed Sensor A Circuit Low

P07C5 indicates that the powertrain control module has detected an abnormally low voltage signal on the intermediate shaft speed sensor A circuit, which typically measures the rotational speed of an intermediate shaft inside the transmission. The computer compares this signal against expected values from other speed sensors and sets the code when the voltage falls below the calibrated threshold for a set period.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaTransmission

Symptoms you may notice

  • Illumination of the check engine light, often with no other noticeable symptoms
  • Harsh or delayed transmission shifts, especially during acceleration or deceleration
  • The transmission may enter limp mode, limiting vehicle speed and gear selection
  • Incorrect or erratic speedometer readings on some vehicles
  • A noticeable loss of power or hesitation when accelerating from a stop

Common causes, most likely first

  1. Damaged or chafed wiring in the intermediate shaft speed sensor circuit, often near connectors or heat sources
  2. A faulty intermediate shaft speed sensor itself, due to internal failure or contamination
  3. Corroded, loose, or water-intruded electrical connectors at the sensor or transmission harness
  4. A short to ground or open circuit in the signal wire between the sensor and the PCM
  5. Mechanical issues inside the transmission, such as a damaged reluctor wheel or excessive bearing play
  6. A malfunctioning powertrain control module, though this is rare

How to diagnose and fix it

  1. Perform a visual inspection of the sensor, wiring, and connectors for obvious damage, corrosion, or loose pins
  2. Use a scan tool to check for related codes and freeze-frame data to confirm the fault conditions
  3. Measure the sensor's resistance and compare it to the manufacturer's specification to rule out an internal sensor failure
  4. Backprobe the sensor connector and check for a proper voltage signal while rotating the intermediate shaft by hand or during a road test
  5. Check circuit continuity and resistance between the sensor and PCM, looking for opens or shorts to ground
  6. If the wiring and sensor test good, inspect the transmission internally for mechanical faults such as a damaged reluctor wheel
  7. Replace the faulty sensor or repair the wiring as needed, then clear codes and verify the repair with a test drive

What a low signal really means

  • A low voltage code often results from a poor ground connection or a short to ground in the signal wire, not necessarily a failed sensor.
  • Debris or metallic particles on the sensor tip can disrupt the magnetic pickup and cause a low signal without any electrical fault.
  • On some transmissions, the intermediate shaft speed sensor shares a ground with other sensors, so a fault in one circuit can affect multiple readings.
  • A failing sensor may still produce a signal at low speeds but drop out at higher RPM, so a static resistance test alone can miss the problem.
  • Always check for technical service bulletins specific to the vehicle, as some models have known harness routing issues that cause this code.

Can I keep driving with P07C5?

You can usually drive the vehicle short distances to a repair shop, but avoid aggressive acceleration or highway speeds because the transmission may shift erratically or enter limp mode. If the vehicle feels unsafe or refuses to shift, stop driving and have it towed.

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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