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DTC codes / Mazda codes / P1708

P1708 · MazdaClutch Switch Circuit

P1708 on Mazda vehicles indicates that the powertrain control module (PCM) has detected an implausible signal from the clutch switch circuit, which monitors the clutch pedal position. The PCM expects a specific voltage change when the clutch pedal is pressed or released, and this code sets when the circuit stays open, shorted, or otherwise out of range.

SystemPowertrain
Code typeMazda specific
SeverityMedium
Fix difficultyIntermediate
AreaTransmission

Symptoms you may notice

  • The check engine light or malfunction indicator lamp (MIL) illuminates on the dashboard.
  • The engine may not start because the clutch pedal must be depressed to engage the starter on manual-transmission models.
  • Cruise control may become inoperative or disengage unexpectedly if the clutch switch is used to cancel cruise.
  • The engine may idle poorly or hesitate during gear changes if the PCM cannot correctly determine clutch pedal position.
  • Often no symptoms besides the warning light, especially if the switch fails only intermittently.

Common causes, most likely first

  1. Faulty clutch pedal position switch (clutch switch) internally worn or sticking.
  2. Damaged or disconnected electrical connector at the clutch switch.
  3. Broken, chafed, or corroded wiring in the clutch switch circuit between the switch and the PCM.
  4. Misadjusted clutch switch mounting or pedal stop, preventing the switch from actuating correctly.
  5. Failed clutch pedal return spring or worn pedal assembly causing inconsistent switch contact.
  6. Water intrusion or contamination in the switch or connector, leading to intermittent signals.
  7. Rarely, a PCM internal fault misreading the clutch switch input.

How to diagnose and fix it

  1. Verify the code with a scan tool and check for any related codes in the PCM and body control module (BCM).
  2. Inspect the clutch switch connector and wiring for looseness, corrosion, or damage, and repair as needed.
  3. Test the clutch switch operation with a multimeter to confirm it opens and closes correctly when the pedal is pressed and released.
  4. Check the clutch pedal adjustment and switch mounting to ensure the switch is actuated through its full range.
  5. If the switch fails the electrical test, replace the clutch switch and clear the code.
  6. Clear the diagnostic trouble codes (DTCs) and road test the vehicle to confirm the code does not return.
  7. If the code persists after switch replacement, perform a voltage drop test on the circuit and inspect the PCM connector and grounds.

Clutch switch faults that fool technicians

  • A misadjusted clutch switch is a common cause of P1708 that many technicians overlook because the switch itself tests fine on the bench.
  • The clutch switch circuit often shares a ground with other sensors, so a bad ground can set P1708 along with other unrelated codes.
  • On some Mazda models, the clutch switch signal is also used by the cruise control system, so a failing switch may cause cruise control issues before the code sets.
  • Intermittent P1708 codes can be caused by a worn clutch pedal bushing that allows excessive side-to-side movement, changing switch actuation.
  • Do not replace the PCM for P1708 until you have thoroughly tested the clutch switch circuit and ruled out all mechanical adjustment issues.

Can I keep driving with P1708?

If the vehicle starts and drives normally, you can drive it to a repair shop, but avoid relying on cruise control and be aware that the engine may not restart if the switch fails completely. If the engine will not start or the clutch pedal feels abnormal, stop driving and have the vehicle 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 Mazda vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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