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

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:

• Difficulty or inability to shift into reverse gear
• Reduced fuel efficiency

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.