P0927 - Shift Reverse Actuator Circuit High

P0927 – OBD-II Trouble Code Technical Description

High signal level in the gear shift reverse drive circuit

What does the fault code mean P0927?

Trouble code P0927 indicates a high signal in the shift reverse actuator circuit. This diagnostic code applies to transmission systems in OBD-II equipped vehicles and indicates that the ECM has detected a high, abnormal voltage in the reverse actuator.

The problem may be due to a malfunctioning reverse shift guide or shaft in the transmission, making it difficult or impossible to shift into reverse. It is important to contact a specialist to diagnose and fix this problem.

The “P” in the first position of the code indicates the transmission system, the “0” in the second position indicates a general OBD-II fault code, and the “9” in the third position indicates a specific fault. The last two characters “27” represent the diagnostic code (DTC) number.

Possible reasons

Code P0927 may indicate the following problems:

• Problem with the forward gear shift actuator.
• Faulty forward gear selection solenoid.
• Short circuit or damaged wiring.
• Faulty harness connector.
• The transmission control module (TCM) may be faulty.

Causes of high voltage in the shift reverse drive circuit may include a faulty reverse drive circuit, mechanical problems in the transmission, or other possible defects.

What are the symptoms of a fault code? P0927?

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

• Helplessness when engaging reverse gear
• Difficulty or impossibility of changing reverse gear.
• The "Check Engine" warning light on the instrument panel comes on (the code is stored as a fault).
• The gearbox is not working properly.
• Gears do not engage or shift.

How to diagnose a fault code P0927?

To diagnose trouble code P0927, follow these steps:

1. A qualified mechanic should first check for the P0927 code using a scan tool. It is also important to check for additional fault codes. If multiple codes are found, the mechanic should look at them in the order they appear on the scanner.
2. Next, the mechanic should clear the error codes, restart the vehicle, and check to see if the P0927 code persists. If the DTC does not persist after a reset, it may indicate an intermittent or random problem.
3. If the P0927 code persists, the mechanic should move on to further diagnostics to determine the cause. This may include checking the wiring, connectors, solenoids, and other components associated with the shift reverse actuator.
4. It is important to pay attention to mechanical aspects such as the condition of the shift shaft and idler gear in the transmission. If these items are damaged, they can cause code P0927.
5. Finally, a mechanic must make the necessary repairs and component replacements to eliminate the cause of the P0927 code. After this, the error code should be reset again and the car should be tested to ensure that the problem has been resolved.

Diagnostic errors

When diagnosing a P0927 code, the following common errors may occur:

1. Lack of attention to wiring and connectors, which may be damaged or poorly connected, may cause incorrect diagnostic results.
2. Neglect of other related fault codes that may affect the operation of the gear reverse actuator, but were not detected during the initial inspection.
3. Insufficient inspection of mechanical components, such as the shift shaft and idler gear, which may be damaged or worn, causing the P0927 code to occur.
4. Errors in assessing the operation of solenoids and actuators, which may be faulty and cause problems with the reverse drive, but were not detected during the initial diagnosis.

How serious is the fault code? P0927?

Trouble code P0927 is serious because it indicates a high signal level in the shift reverse actuator circuit. This can lead to problems with reverse shifting and even affect the performance of the transmission as a whole. It is recommended that you contact a professional immediately to diagnose and repair this problem as it can significantly affect the safety and performance of your vehicle.

What repair will help eliminate the code? P0927?

To resolve trouble code P0927, it is necessary to diagnose the transmission system and identify the specific cause of the high signal level in the shift reverse drive circuit. Depending on the problems found, the following measures may be required:

1. Checking the integrity and serviceability of wiring, connectors, as well as the condition of the relay in the gear reverse drive circuit.
2. Check and, if necessary, replace the forward gear shift actuator or forward gear selection solenoid.
3. Check for short circuits or damage to wiring and connectors, and correct any problems found.
4. Check and, if necessary, replace the faulty transmission control module (TCM).
5. Perform repairs to mechanical components, such as the idler gear or shift shaft, when found to be faulty.

It is important to carry out thorough diagnostics and repairs, taking into account the specific characteristics of the vehicle and the type of transmission. It is recommended that you consult a qualified mechanic or transmission specialist for a more detailed repair plan.

What is P0927 Engine Code [Quick Guide]