Causes of Subaru OBD2 Code P0700
To identify the root cause of Subaru OBD2 Code P0700 with its malfunctioning transmission, you need to know the possible causes behind this code. This section focuses on the causes of the P0700 code, such as malfunctioning transmission control system, faulty shift solenoids or valve, issues with ECM or TCM, malfunctioning sensors, and fluid leaks. By understanding these causes, you can fix the underlying problem and prevent future performance issues.
Malfunctioning Transmission Control System
The transmission control system is responsible for controlling the power and speed of your car’s movements. Malfunctioning can lead to reduced performance, and eventually, breakdowns.
This system failure triggers the OBD2 code P0700. This module communicates with other components, such as sensors, solenoids, and valves.
Faulty TCM wiring or connectors, damaged solenoids or valves, and low fluid levels can all contribute to a malfunctioning transmission control system.
If you notice issues with gear shifting or slipping, it’s essential to get your car checked. Early diagnosis and repair will help protect your transmission from further damage.
Don’t wait until it’s too late! Get your car inspected regularly by a professional mechanic. Prevention is always better than cure. Remember, Subaru is putting the ‘shift‘ in ‘shit happens‘ when it comes to faulty shift solenoids.
Faulty Shift Solenoids or Valve
Subaru vehicles can suffer from OBD2 code P0700 due to a malfunctioning shift solenoid or valve. This part is responsible for controlling gear shifting and fluid flow within the transmission.
A faulty solenoid or valve can lead to improper shifting, stalling, and poor performance. Mechanics can check it by using an ohm meter to conduct electrical tests.
The table below shows the different voltage values for each gear, which are produced by the transmission control module.
| 1st Gear | 2nd Gear | 3rd Gear | 4th Gear | |
|---|---|---|---|---|
| Voltage Check Value | .21-.27V | .11-.13V | .04-.06V | .01-.03V |
If one of these voltages falls outside of this range, it indicates a problem with a particular solenoid that may need replacing.
In older models, debris build-up from contaminated transmission fluid can also cause issues with the shift solenoids or valve. Regular servicing and fluid changes can help prevent this.
Subaru has acknowledged solenoid problems since 2010 and offered free replacements as part of recalls.
Issues with ECM or TCM
The OBD2 code P0700 on your Subaru vehicle could be triggered by the Electronic Control Module (ECM) or Transmission Control Module (TCM).
There can be multiple causes for this:
- Loss of communication between systems.
- Faulty sensors misreporting.
- Burnt-out fuses and circuits.
- Worn-out solenoids and components.
- Oxidized terminals.
- Damaged wiring harnesses.
If these issues aren’t addressed, it can lead to serious transmission damage. To prevent this, consult a mechanic as soon as any warning signs are detected. Don’t let electrical problems become costly repairs!
Malfunctioning Sensors
Subaru models often trigger OBD2 Code P0700 when sensors detect any abnormality in the transmission control system. Sensors that monitor input/output hydraulic pressure levels and vehicle speed monitor gear shifting. Malfunctioning of these sensors can cause complications, leading to costly repairs.
If one’s Subaru emits any suspicious noises or odors from the engine bay, or has difficulty shifting smoothly, they should seek help immediately. Regular monitoring and early detection of errors is essential to avoid damaging expensive transmission parts and potential danger from an unroadworthy vehicle. And who wants a Slip ‘N Slide when your Subaru leaves fluid leaks all over the driveway?
Fluid Leaks
Subaru OBD2 Code P0700 is caused by the leakage of automotive fluids. Seals and gaskets fail, or lines, hoses, or fittings get damaged, allowing liquids to escape. This can interfere with signals and cause issues for the vehicle’s electronics.
It’s important to check fluid levels regularly and inspect for any drips, puddles, stains, or odours. If any are found, take your car to a qualified mechanic. They can diagnose and repair the issue properly.
In 2018, Subaru recalled over 25k vehicles due to fuel gauge display errors caused by rust near filler pipes. Early detection and remedy of fluid leaks can help prevent serious safety hazards. Be aware of the symptoms of Subaru OBD2 Code P0700.
Symptoms of Subaru OBD2 Code P0700
To identify the symptoms of Subaru OBD2 code P0700 related to the transmission control system malfunction, the article dives into the most common signs of trouble that you should watch out for. In this section, we will talk about these symptoms, including gear slippage, poor performance, the malfunction indicator light (MIL) on, and automatic gearbox issues.
Gear Slippage
Signs of Gear Slippage can indicate various problems with your Subaru’s transmission system. These include:
- Trouble shifting or changing gears
- Abnormal sounds coming from gearbox
- Burning smell coming from engine
- Lack of power when accelerating
- Frequent ‘Check Engine’ light on dashboard
- Sudden drop in fuel efficiency
Diagnosing this issue is tricky, as other transmission issues show similar symptoms. So, it’s best to get an experienced and qualified mechanic to examine the problem.
I once had a friend who had to face the same issue while travelling with me. Their vehicle had trouble shifting gears, eventually leading to slippage, which made driving hazardous. After that, they needed a full overhaul of their Subaru’s transmission system. Thus, disregarding these signs and not getting timely mechanics attention can be costly in the long run.
It looks like your Subaru has been unwillingly added to the ‘slow and steady’ club.
Poor Performance
Subaru OBD2 Code P0700 can make your car’s performance suffer. Symptoms such as rough idling, slow acceleration and sluggishness when driving could be present. It is wise to take your car to a professional to figure out the cause.
The check engine light may come on in connection with P0700. This could mean a variety of problems. It’s important to get a proper diagnosis and take care of any issues quickly.
Don’t wait if your Subaru isn’t performing well. Early detection makes it easier to resolve and prevent further damage.
Pro Tip: Regular maintenance can help avoid OBD2 codes like P0700. Follow your manufacturer’s recommended service schedule for the best performance and reliability!
Malfunction Indicator Light (MIL) On
Your car’s electronic system detects a fault and lights up the dashboard warning light – the Malfunction Indicator Lamp (MIL). This means something is wrong with your transmission control system.
When OBD2 code P0700 appears, it shows a fault in the transmission. You may experience harsher shifting, delay in shifting gears or even failure to shift at all. Plus, the engine may shake, fuel economy drops and emissions rise.
Not fixing it soon can cause more damage and accidents. Subaru cars are especially vulnerable because dirt and debris block solenoid valves and confuse sensors.
Don’t wait – fix it ASAP for your car’s optimal performance and safety.
Automatic Gearbox Issues
Do you have an automatic gearbox in your Subaru vehicle? Wear and tear can cause issues with it, resulting in frustrating driving experiences. Here are signs to watch out for:
- Harsh shifting and slipping gears? If your transmission shifts abruptly or jerks, or if your gear slips while accelerating or cruising, be wary of an issue.
- Delayed engagement? This is when you shift to another gear but don’t get the expected acceleration. It could mean a lack of pressure in the hydraulic system.
- Noises? Faulty gearboxes often make strange sounds such as whining or grinding.
Don’t ignore these signs, as they can worsen and lead to complete transmission failure. Get timely maintenance from a qualified mechanic to avoid expensive repairs and downtime.
My friend recently had similar symptoms with their Subaru vehicle. It was a faulty valve body causing the P0700 code in their OBD2 scanner. Our mechanic team fixed it quickly, saving them from extra costs that could have come from extensive damage. Don’t worry about P0700 – unless your Subaru is a spaceship, it’s not rocket science!
Fixes for Subaru OBD2 Code P0700
To fix the Subaru OBD2 Code P0700 issue, you need to check and replace faulty components, repair fluid leaks, reset the computer module, or replace the powertrain control module. In this section, we’ll cover these sub-sections that offer solutions to resolve the issue. Whether it’s a malfunctioning transmission control system, shift solenoids, or malfunction indicator light, you’ll find ways to fix the problem and prevent gear slippage or performance issues.
Check and Replace Faulty Components
To fix OBD2 code P0700, inspect and replace any broken parts. This keeps the vehicle’s transmission working properly. Here’s how:
- Look over each part of the transmission control system.
- Check the electrical connections for rust or fraying.
- Search for cracks, spills, or wear.
- Use an OBD2 scanner to find faulty pieces.
- Substitute broken parts with new ones.
- Take a test drive to make sure it’s fixed.
Note: Different transmission issues have different causes. Get a mechanic’s opinion before replacing anything. Fix fluid leaks fast before they get worse!
Repair Fluid Leaks
Illumination of Subaru OBD2 Code P0700 can be caused by fluid loss. Here’s a 3-step guide to fix it:
- Examine the transmission fluid level and state.
- Detect any leaks using UV dye detection tools and repair.
- Clean up any spilt fluid, reset the code and retest the system.
It is also advised to use top-notch transmission fluid specified by Subaru. Monitoring fluid levels and quality can stop further damage to your car’s transmission system.
It is important to remember that not addressing fluid leaks quickly could reduce the life of your transmission. According to Consumer Reports, the average expense of repairing such damages at dealerships is about $4400. It is time to give your Subaru’s brain a much needed reboot with a computer module reset.
Reset the Computer Module
Resetting the Electronic Control Module (ECM) is a potential solution to clear stored codes in your Subaru. Follow these 4 steps:
- Disconnect the Battery
- Turn On Headlights
- Wait 10-15 mins. Turn off all lights
- Connect Back Battery Cables
This method may not work if underlying issue isn’t fixed. Consult an expert before attempting it.
Ignoring codes can lead to permanent damage or costly repairs. Resetting ECM provides better performance & can save you from major repairs. Replacing PCM isn’t as daunting as finding a date on Tinder.
Replace Powertrain Control Module (PCM)
To resolve Subaru OBD2 Code P0700, replacing the Powertrain Control Module (PCM) is a great solution. It controls communication between your car’s engine and transmission, so it’s important for its smooth operation. Here’s a 5-step guide:
- Switch off engine and disconnect battery’s negative cable.
- Find and unplug all sensors connected to old PCM, and take it out.
- Install new PCM carefully, plugging in all connectors appropriately.
- Reconnect battery’s negative terminal.
- Start engine several times in different gears to test installation.
Before replacing the PCM, make sure it’s the right issue. Don’t replace if other factors are causing Code P0700. Ignoring Code P0700 can damage your vehicle’s transmission badly, costing you in the future. If unsure, consult a mechanic or dealership.
Frequently Asked Questions
Frequently Asked Questions for Subaru OBD2 Code P0700: Transmission Control System (MIL Request)
Q: What is Subaru OBD2 Code P0700?
A: Subaru OBD2 Code P0700 is an OBD-II code for a transmission control system malfunction. It means that the powertrain control module (PCM) has detected a fault in the transmission control system and illuminated the malfunction indicator light (MIL) on the dashboard.
Q: What are the symptoms of Subaru OBD2 Code P0700?
A: Symptoms of Subaru OBD2 Code P0700 may include gear slippage, fluid leaks, performance issues, and other automatic gearbox problems. Drivers may also notice a check engine light on the dashboard.
Q: What are the common causes of Subaru OBD2 Code P0700?
A: Common causes of Subaru OBD2 Code P0700 include faulty sensors, issues with the valve body or shift solenoids, a failed transmission control module (TCM), or problems with the electronic control module (ECM).
Q: What are some fixes for Subaru OBD2 Code P0700?
A: Fixes for Subaru OBD2 Code P0700 will depend on the underlying cause of the fault. Drivers should have their vehicles diagnosed by a professional mechanic or dealership to determine the root cause and plan a course of action. Possible fixes may include replacing faulty sensors, repairing leaks, flushing the transmission fluid and replacing filters, or replacing the TCM.
Q: Can Subaru OBD2 Code P0700 cause permanent damage to the vehicle?
A: Leaving Subaru OBD2 Code P0700 unchecked can eventually cause permanent damage to the vehicle’s transmission. It is important to have the issue diagnosed and fixed as soon as possible to avoid costly repairs down the line.
Q: Is it safe to drive with Subaru OBD2 Code P0700?
A: It is generally not safe to drive with Subaru OBD2 Code P0700 as the fault can cause unpredictable gear shifting, engine stalling, or other potentially dangerous driving conditions. We recommend having the issue diagnosed immediately and repaired to ensure safe driving conditions.
Suggested Workshop Manual Pages –
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Subaru Legacy P0730 P0734 ( P0731 P0732 P0733 0730 0731 0732 0733 0734 )
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