P0704

Clutch Switch Input Circuit

Transmission / clutch switch Generic OBD-II High

What it means

P0704 means the computer sees a problem with the clutch switch input — the sensor that tells it whether the clutch pedal is pressed. On manual-transmission vehicles this switch often must be pressed to allow starting and is used by cruise control, so a fault tends to block cranking or disable cruise rather than change how the engine runs.

High

Can I keep driving? Usually drivable, but on manual cars that need the clutch pressed to start a faulty switch can block cranking, and cruise control may stop working.

Real-world scan data

Seen in

4,290

scans in the past year

Found in

0.7%

of scans

1.2%

of scans that found faults

Appears alongside · share of P0704 scans

P0401in 21.7% of scans

P1646in 19.5% of scans

P0683in 19.4% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Cruise control won't engage or drops out
On clutch-start vehicles, the engine may not crank unless the pedal position reads correctly
Stored transmission/PCM code with otherwise normal running

Common causes

Most likely first

Faulty or misadjusted clutch pedal position switchLikely
Wiring or connector fault at the switchCommon
Loose or corroded connectionCommon
Failed TCM/PCM input (less common)Less often

How to diagnose & fix

Work through it in order

Scan and confirm the code; check cruise-control and start behavior.
Inspect and, if adjustable, re-set the clutch switch position.
Test switch continuity as the pedal is pressed and released.
Check the wiring and connector for damage, then replace the switch if it fails testing. Clear and re-test.

FAQ

Quick answers

Is it safe to drive with P0704?+

Usually yes to drive, but cruise control may not work and, on some manuals, starting can be affected. It is not an engine-damage risk.

Can I just clear P0704?+

If the switch or its wiring is faulty the code returns; clearing won't restore cruise or start-enable function.

Read & clear P0704 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX