P0900 OBD-II Trouble Code: Clutch Actuator Circuit / Open

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

SCHEDULE P0900 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0900 code

P0900 is a diagnostic trouble code (DTC) for "Clutch Actuator Circuit / Open". 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 $69.99. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 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$69.99$20.00
Toyota$69.99$20.00
BMW$69.99$20.00
SCHEDULE P0900 DIAGNOSTIC Get a fair and transparent estimate upfront

Check Engine Light

P0900 code definition

This trouble code is defined as the clutch actuator circuit being open.

What the P0900 code means

When the PCM (powertrain control module) detects an open circuit in the clutch actuator control circuit, it will log a P0900 code. The PCM is constantly monitoring the output voltage of the actuator as it engages and disengages the vehicle’s clutch. In order to change gears, the PCM has to send out a command to energize the clutch actuator so it releases the clutch. After that, actuators in the transmission disengage the current gear and engage the next one (whether higher or lower).

Some models use a solenoid-type device in their actuators to operate a specific kind of clutch that uses brake fluid. Others use pneumatic actuators, hydraulic actuators, electronic sensors or some combination of these controlled by microprocessors. In any case, if this code gets reported, it’s because a circuit is left open so the PCM can’t engage a gear.

What causes the P0900 code?

There are a number of reasons that could be behind the P0900 code:

  • Corrosion of the electrical connectors
  • Electrical failures inside the actuator solenoids or motors
  • Motion or travel sensors failing in the clutch
  • Damaged wires
  • Loss of ground

The problem could also be that the PCM is faulty. However, this is incredibly rare and, if the PCM was reporting codes erroneously, they wouldn’t be accompanied by the symptoms mentioned below.

What are the symptoms of the P0900 code?

The main symptom of this trouble code is simply that the vehicle won’t engage a gear. However, the issue could also spread and affect other components. Aside from a Check Engine light, these symptoms may be present too:

  • The engine stalls after control system failure
  • The engine doesn’t crank (this is actually a safety precaution activated by the PCM).
  • The transmission enters into “limp” mode
  • The transmission gets stuck in one gear, but doesn’t enter into “limp” mode

How does a mechanic diagnose the P0900 code?

A qualified mechanic will begin by using an OBD-II scanner to retrieve all the trouble codes that have been stored on a vehicle. They will then proceed to address any accompanying issues that may have come before P0900. Finally, they will need to do some combination of the following steps:

  • Inspect the PCM terminal voltage
  • Inspect the PCM terminal condition
  • Inspect the clutch actuator circuit
  • Inspect the clutch actuator harness and connector
  • Inspect the clutch actuator assembly

Common mistakes when diagnosing the P0900 code

A common mistake that a lot of mechanics make is only addressing one of the above. They may fix the PCM terminal voltage problem and assume that’s the end of it when really the clutch actuator needs some attention too.

Another error is not using the OBD-II scanner because a seasoned mechanic may listen to the owner’s description of the problem and assume they know how to act. While they may address the P0900 problem, there could be others that played a role in it occurring in the first place and will do so all over again.

How serious is the P0900 code?

The code is serious insofar as the vehicle will be impossible to operate until the underlying problem gets fixed. It could also lead to a problem on the road, like the vehicle stalling out, leaving the owner stranded and in need of a tow. For this reason, even if the problem seems to go away after a minute, it’s really best to have a mechanic take a look ASAP.

What repairs can fix the P0900 code?

To fix this problem, a mechanic will do some combination of the following:

  • Repair faulty wiring or connectors
  • Replace PCM terminals
  • Replace the clutch actuator

In very rare scenarios, the PCM may need to be replaced.

Additional comments for consideration regarding the P0900 code

As we covered earlier, there are a number of different actuators, so when addressing the P0900 code, it’s important to understand how it works and how its mechanics affect the rest of the vehicle.

Need help with a P0900 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
Check Engine Light
P0900

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

SCHEDULE P0900 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

4,150

Rating Summary
3,799
173
45
26
107
3,799
173
45
26
107
Kenneth

Kenneth

17 years of experience
374 reviews
Kenneth
17 years of experience
Professional and knowledgeable about his craft!
1999 MERCEDES-BENZ S500 - CHECK ENGINE LIGHT IS ON INSPECTION - LOS ANGELES, CALIFORNIA
Honorio

Honorio

16 years of experience
658 reviews
Honorio
16 years of experience
Honorio always arrives on time, is knowledgeable about the work, and proactive in suggesting solutions. It is always a pleasure working with Honorio!
2007 HONDA FIT - CHECK ENGINE LIGHT IS ON - PALO ALTO, CALIFORNIA
Robert

Robert

29 years of experience
179 reviews
Robert
29 years of experience
Everything was great about the experience except for the mobile app. When I tried to schedule a time I selected 11am but it gave me 9am.
1999 TOYOTA SOLARA - CHECK ENGINE LIGHT IS ON - SAN JOSE, CALIFORNIA
Justin

Justin

17 years of experience
42 reviews
Justin
17 years of experience
As before perfect customer service. My brakes were a mess, nuts breaking, rotors ate up and wrong parts coming in for the repairs. Justin kept me informed of every step that was being taken to make sure the job was done right safely. It took 2 visits, idk how many phone calls or trips Just in made to the parts store but not once did I feel out of the loop or concerned about what he was doing let alone worried that like a lot of mechanics trying to take advantage of my wallet. After having both my truck brakes and car brakes done by Justin, I'll never go to anyone else. You've got a customer for life Justin. Thank you so much for the excellent job.
2001 NISSAN FRONTIER - CHECK ENGINE LIGHT IS ON - PHOENIX, ARIZONA

More related articles

Veteran and Military Driver Laws and Benefits in Idaho
The state of Idaho offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch in the...
Veteran and Military Driver Laws and Benefits in New Mexico
The state of New Mexico offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...

Related questions

Q: What is P0335 Crankshaft Position Sensor A Circuit and where is it located?

Hello - this message (P0335) indicates that the crankshaft position sensor is failing, causing the "cutting off" you have already noticed. It is located on the bottom of the engine/transmission interface (drivers side of the vehicle). To avoid any unnecessary...

Q: Need to know if I should replace my turbo or not

Hi, thanks for writing in. The turbo system is comprised of several different components. Without knowing the exact trouble code, it would be hard to guess at what is going on. There could be a bad sensor, a leaking intake...

Q: power shuts down,but will run and drive very slow

For issues like this you should have the system computer scanned and have any codes diagnosed by a mechanic. The cost to have the problem properly diagnosed far out weighs throwing parts at the problem hoping to fix it. The...

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