What Is the P0736 Code?
Symptoms
Causes
Seriousness
Can I Still Drive?
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The P0736 code definition is “Reverse Incorrect Ratio,” sometimes also called “Reverse Incorrect Gear Ratio.” This diagnostic trouble code indicates that your powertrain control module (PCM) or engine control module (ECM) has identified an issue with shifting into reverse gear or that there’s a transmission issue when driving in reverse. This generic OBD-II powertrain code can show up in just about any modern OBD-II-equipped vehicle with an automatic transmission.
More About the P0736 Code
In an automatic transmission, shifting into reverse is much more complicated than in a manual transmission. It requires mechanical components like the low-reverse clutch and shift solenoids, which aren’t engaged in a manual transmission. During the reverse gear shift and driving, your powertrain control module (PCM) and transmission control module (TCM) analyze information from the transmission speed sensors, allowing them to understand your vehicle’s gear ratio, engine speed, and whether any transmission slippage is occurring. The P0736 code indicates that there has been an issue based on this information.
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What Are the Symptoms of a P0736 Code?
The most common symptom of the P0736 code, especially if it’s just by itself, is that the check engine light will turn on. However, transmission codes often cause more severe symptoms. In this case, outside of the check engine light, you might see the transmission refuse to shift into reverse entirely and slip out of reverse. In some cases, transmission slippage can occur even when driving normally, and you may also see increased fuel consumption, especially if other transmission codes accompany this incorrect gear ratio code.
What Are Some Causes of a P0736 Code?
This is an extremely broad diagnostic trouble code, which means it can come from electrical issues or mechanical issues. There are a wide array of possible causes, but you may need to look at any of these:
- Dirty transmission fluid
- Low transmission fluid level
- Failed transmission valve body
- Low fluid pressure due to blockage
- Faulty shift solenoid
- Transmission sensor issues
- Internal transmission failure
- PCM or TCM issues (uncommon)
In general, because this code is so vague and general, you won’t be able to tell the actual causes of this code until you do extra research. Narrowing down the causes so you can come up with repair steps will require you to check a number of different components of your vehicle.
How Serious Is the P0736 Code?
The P0736 code is pretty serious. This code can indicate general shift issues, not just reversing issues. Plus, in some cases, this code can cause you to be unable to shift into reverse at all, which can cause major problems with parking your vehicle. Whether the problem is faulty solenoids and therefore bleeds over into your general shifting abilities or it’s specifically an error having to do with putting your vehicle in reverse, it’s a serious code that you should definitely fix as soon as possible.
Can I Still Drive with a P0736 Code?
You can usually physically drive with the P0736 code active, but it may not be especially safe to do so. Being able to reverse your vehicle is very important, even if it seems like you don’t use it very frequently. Any time you park your car in a parking lot, you’ll likely end up having to reverse out of the parking spot, for example. Plus, this code can also result in general shifting issues, which can lead to issues with torque converter slip and more. If you have issues with incorrect ratio code P0736, you should avoid driving and take your vehicle to an expert.
How Easy Is It to Diagnose a P0736 Code?
The diagnostic tools and processes necessary for the P0736 code can sometimes be very complex. This code only indicates that there’s some kind of issue with the reverse gear — it doesn’t give you any insight into why that issue is occurring or where the issue is located. It could be anything from an internal blockage to a problem with internal wiring. This type of malfunction often requires advanced knowledge because of how complex it can be to understand. An auto shop will be much more effectively set up to return your vehicle to correct operation.
How Difficult Is It to Inspect a P0736 Code?
As with diagnosis, inspection can be quite difficult for the P0736 code. That’s because this code regularly requires a pretty in-depth inspection. For automatic transmission vehicles, any amount of inspection within the transmission can be incredibly complicated and even lead to the possibility of worsening problems if you perform an incorrect transmission fix. Instead of trying to do it yourself, potentially leading to expensive repairs down the line, get help from an auto repair shop for the best results.
Need Additional Help with Your P0736 Code?
Many people end up needing additional help with the P0736 code. If you’re not sure what to do with this code and you want to avoid costly repairs in the future, it’s a good idea to talk to an expert first before you start trying to DIY a fix.
When it comes to these kinds of issues, you should find an auto repair shop in your area. Even if your vehicle isn’t showing too many issues with drivability, finding a local mechanic for repairs can help you avoid putting off a fix because it feels too inconvenient to take your vehicle in.
This code also frequently shows up with other codes that may provide further insight into the underlying problem. The OBD-II database at KBB.com can help you understand these possible problems and how you might need to fix them.
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