Skip the auto shop - Our mechanics make house calls

P0927 OBD-II Trouble Code: Gear Shift Reverse Actuator Circuit High

check engine light

The P0927 fault code indicates the Engine Control Module (ECM) detected a problem in the operation of the gear shift reverse actuator of the transmission. The gear shift reverse actuator controls how a vehicle’s transmission shifts into reverse gear.

What the P0927 code means

Put in the simplest of terms, the P0927 OBD-II trouble code means the ECM found a signal indicating the voltage within the gear shift reverse actuator was higher than normal parameters.

This voltage anomaly may be caused by improper function of the guide rail or shift shaft corresponding to reverse gear within the transmission, making it difficult or impossible to shift into reverse gear.

What causes the P0927 code?

While there are several issues that can trigger a higher than normal reading within the gear shift reverse actuator circuit, resulting in the illumination of the Check Engine Light on a vehicle’s dashboard, the cause of the code is likely due to a mechanical problem within the transmission.

What are the symptoms of the P0927 code?*

When the P0927 code causes the Check Engine Light to come on, the following symptoms may be present:

How does a mechanic diagnose the P0927 code?

A certified technician must first verify the existence of the P0927 code with a specialized scan tool before moving further. Multiple scans may be necessary to ascertain if the problem is intermittent or constant along with other tests, including a visual inspection.

Common mistakes when diagnosing the P0927 code

After the P0927 code registers, a technician may make the following mistake(s):

  • Not verifying the voltage running through the gear shift reverse actuator is high
  • Failure to visually inspect the transmission, especially components relating to reverse gear
  • Forgetting to clear the P0927 OBD-II fault code after the issue is resolved

How serious is the P0927 code?

A vehicle registering the P0927 code can still run, although it may not be able to shift into reverse gear easily or at all. Over time, this issue can affect the function of other parts and systems, so it is advisable to promptly contact a qualified mechanic for assistance in diagnosing and repairing the root cause of the P0927 code registering.

What repairs can fix the P0927 code?

After a qualified mechanic uses a specialized scan tool to verify the existence of the P0927 code, the vehicle may need the following repair(s):

  • Adjusting the guide rail or shift shaft corresponding to reverse gear
  • Replacing the transmission as a whole
  • Replacing the ECM in rare cases

Additional comments for consideration regarding the P0927 code

Any time an OBD-II trouble code, such as P0927, is detected, prompt attention is advisable.

Neglecting to diagnose and repair the root cause of the trouble code can make the situation worse, which necessitates greater costs and hassle down the road.

It can also take up to several hours to diagnose the cause of the P0927 code. Multiple scans may be needed along with other tests to ensure and repairs or parts replacements have effectively resolved the issue.

Need help with a P0927 code?

YourMechanic can put you in touch with a mobile mechanic who can come to your home or office to diagnose the cause of the P0927 OBD-II trouble code and fix the issue. Get a quote and book an appointment online or talk to a service representative at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.


Post a question and get free advice from our certified mechanics.


More related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....
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...

Related questions

Q: Code p0420

Hello. P0420 could be due to a variety of faults including even a fuel pump that is not supplying sufficient fuel, causing a lean condition, and hence "fooling" the O2 sensors (pre and post) as to the status (i.e., efficiency)...

Q: Check Engine Light and air conditioning problems

The Check Engine Light illumination is most likely due to your engine having a misfire, and also getting a code to the cam sensor. If the misfire code is pointing to a particular cylinder misfiring, there could be another problem...

Q: Check engine light came on while driving

The Check Engine Light is an indicator that something is affecting your emissions in a negative way. This can be as simple as a loose gas cap, to a misfire and many things contribute to the overall emissions output. The...