Definition of Code P0914
When a vehicle stores a fault code P0914, it indicates that the Powertrain Control Module (PCM) has detected a problem with the gear shift position circuit. Associated codes include fault codes P0915, P0916, P0917, and P0918.
What Does Code P0914 Mean?
A fault code P0914 indicates an electrical error in the gear shift position circuit. When the voltage from the gear shift position sensor varies too much according to the manufacturer’s specifications, a P0914 fault code is recorded and the check engine light illuminates.
What Causes Code P0914?
The most common reason for storing a P0914 fault code is damaged or faulty wiring, connectors, or components in the gear shift position system. Blown fuses, a short circuit to the battery ground, and a faulty PCM can also cause this code to be stored.
What Are the Symptoms of Code P0914?
Symptoms of a P0914 fault code include harsh shifting and, in some cases, the inability to change gears. Another common side effect of a P0914 fault code is a reduction in the fuel consumption of the vehicle that recorded the code.
How Does a Mechanic Diagnose Code P0914?
To diagnose and repair a P0914 fault code, a mechanic must use an advanced scanner and a digital voltmeter/ohmmeter. Using this equipment, the mechanic must perform the following tasks:
Carefully inspect all wiring, connectors, and components for any damage.
Clear the code and test the vehicle to see if the code returns.
If the code returns, download all freeze frame data and stored codes for use in further diagnosis.
Using a digital voltmeter/ohmmeter, the mechanic must then test the voltage and ground signal at the gear shift position circuit.
If no voltage or ground signal is detected, the mechanic must first disconnect the PCM and other associated control modules. Then, they should test the continuity of the gear shift position circuit with the battery ground.
If the code returns after clearing it, the mechanic must inspect the gear shift shaft to see if it is functioning properly.
Additionally, the mechanic must also inspect the gear guide rail to see if it is damaged.
If both of these components appear to be correct, the mechanic should suspect a faulty PCM.
The mechanic must inspect and test the PCM to see if it is bad or simply needs to be reprogrammed.
Finally, the mechanic must clear the code and retest the system to see if the code returns.
Common Mistakes When Diagnosing Code P0914
Mechanics diagnosing and correcting a P0914 fault code most often make the mistake of replacing the entire gear shift position system when the problem was related to a much cheaper and easier-to-replace electrical component, connector, or wiring. Additionally, failing to clear codes when they are stored can result in not resolving the issue causing the code, which will lead to its eventual return.
How Severe Is Code P0914?
A stored P0914 fault code could only cause shifting problems, although in some cases, the vehicle’s gear lever may refuse to operate. This is why it is imperative that a mechanic addresses the P0914 fault code upon its first storage. Furthermore, the conditions causing the storage of a P0914 fault code can further damage the transmission if not diagnosed and treated.
What Repairs Can Fix Code P0914?
- To repair a P0914 fault code, a mechanic must take the following steps after diagnosis:
- Replace any faulty or damaged wiring, connectors, or components.
- Replace the gear shift position circuit if it is faulty.
- Replace the gear shift shaft if it is damaged and not functioning properly.
- Replace the gear guide rail if it is damaged.
- Replace the PCM if it is faulty. The mechanic must also reprogram the PCM once installed.