P0704 OBD-II Trouble Code: Clutch Switch Input Circuit Malfunction

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P0704 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0704 code

P0704 is a diagnostic trouble code (DTC) for "Clutch Switch Input Circuit Malfunction". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$70.00$30.00
Toyota$70.00$30.00
BMW$70.00$30.00
SCHEDULE P0704 DIAGNOSTIC Get a fair and transparent estimate upfront

Check Engine Light

P0704 code definition

The powertrain control module (PCM) will detect and store the P0704 code if it does not detect a change in the clutch switch’s voltage signal when the clutch pedal is held down.

What the P0704 code means

When the driver holds the clutch pedal down while shifting, the voltage signal sent to the PCM from the clutch switch should go from high to low. If that signal does not change when the vehicle is in motion, the PCM will assume that there is a problem with the clutch or clutch switch and set the P0704 code, causing the Check Engine light to illuminate.

What causes the P0704 code?

The problems that can cause a P0704 to be set include:

  • A faulty or damaged clutch switch
  • A shorted or open clutch switch circuit
  • Damaged or corroded wiring or connectors in the clutch switch circuit
  • A poorly adjusted clutch switch

What are the symptoms of the P0704 code?

When the P0704 code is set, a number of symptoms can occur, in addition to the Check Engine light going on (which will always occur). The most common of these are:

  • The engine fails to start.
  • The engine will start without holding the clutch pedal down.

How does a mechanic diagnose the P0704 code?

Upon using an OBD-II scanner to determine that a P0704 code has been set, the mechanic will first inspect the wiring and connectors of the clutch switch to determine if any damage here may be causing the problem. If there is no damage to these, they will check to ensure that the Clutch switch is properly adjusted. If the switch does not open and close as the clutch pedal is held down and released, then the problem is likely with the switch and/or its adjustment.

If the switch has been adjusted correctly and the P0704 code is still detected, the switch may need to be replaced to solve the problem.

Common mistakes when diagnosing the P0704 code

Because this code can cause issues with starting the vehicle, it’s common to assume that the problem is actually located with the starter. Replacing or repairing the starter and/or components associated with it will not resolve the issue or clear the code.

How serious is the P0704 code?

Depending on the symptoms that occur related to the P0704 code, it may not seem very serious. However, with manual transmission vehicles, it is important that the clutch be engaged before starting the vehicle. If the vehicle can start without first engaging the clutch, it can cause other problems to arise.

On the other hand, the vehicle may not be able to start at all or may have a very hard start. This can be dangerous, especially if the vehicle is stalled in traffic and the driver needs to move out of the way.

What repairs can fix the P0704 code?

If a faulty or damaged clutch switch is causing the problem, then the best repair is to replace the switch. However, in many cases, the problem may simply be that the clutch switch is not adjusted properly or that there is damage or corrosion in the circuit. Repairing the circuit and ensuring that all connections are properly fitted could solve the problem without the need to replace the clutch switch.

Additional comments for consideration regarding the P0704 code

Whether or not the vehicle is displaying any other symptoms along with the Check Engine light being illuminated, it’s important to get this code resolved quickly. A faulty clutch switch can cause a number of problems, and if the Check Engine light is on, the vehicle will not pass an OBD-II emissions test, which is required for vehicle registration in most states.

Need help with a P0704 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

trouble codes
P0704
Check Engine Light

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P0704 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.5/5

Number of Reviews

4,004

Rating Summary
3,661
169
45
25
104
3,661
169
45
25
104
Jerome

Jerome

31 years of experience
68 reviews
Jerome
31 years of experience
Jerome did an excellent job explaining what he was doing and why. I appreciated his going into detail about the expected outcome of a particular test and the possible causes of an unexpected outcome.
2013 CHEVROLET MALIBU - CHECK ENGINE LIGHT IS ON - UPPER MARLBORO, MARYLAND
Rusty

Rusty

20 years of experience
263 reviews
Rusty
20 years of experience
Very professional and friendly. Goes out his way to answer all questions. Great guy
2008 INFINITI M35 - CHECK ENGINE LIGHT IS ON - ARLINGTON, TEXAS
Breck

Breck

17 years of experience
355 reviews
Breck
17 years of experience
Fast, friendly, and knowledgeable.
2002 TOYOTA RAV4 - CHECK ENGINE LIGHT IS ON - HOUSTON, TEXAS
Chris

Chris

15 years of experience
109 reviews
Chris
15 years of experience
Very pleasant and professional to work with.
2003 INFINITI FX35 - CHECK ENGINE LIGHT IS ON - FORT LAUDERDALE, FLORIDA

More related articles

P0121 OBD-II Trouble Code: TPS "A" Circuit Range Performance Problem
P0121 code definition Throttle Pedal Position Sensor/Switch (TPS) A Circuit Range Performance Problem...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...

Related questions

Q: Having trouble trying to locate my knock sensor. It's throwing a code for it. 1,2,4,5,6 cylinder misfires

As you may know a knock sensor may fail for any of the following reasons: The knock sensor is faulty and needs to be replaced There is a wiring open/short/fault in the knock sensor circuit The PCM/ECM has failed...

Q: 1999 firebird every now and then dies while driving and low engine power light comes on

A bad mass airflow (MAF) sensor can cause loss of power, no starts, and lean or rich conditions. If cleaning the sensor did not get rid of the P0102 trouble code, then replace the MAF sensor and clear the...

Q: Engine light came on , was hesitant when i pulled off , sometimes cut off when at stop lights

Hi and thanks for your question. Sounds like there could be a fuel or spark issue with your engine. First you would need to scan the computer for what the engine light code has stored to have a starting place...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com