Chrysler Fault Code P0700: Don't Panic, But Pay Attention!
Alright, let's talk about something that can make any car owner's heart sink a little: a Check Engine Light. And if you've got a Chrysler, Dodge, or Jeep product, and your scanner spits out P0700, you might be staring at it wondering, "What in the world is that?" Well, pull up a chair, because we're going to break it down. It's not as scary as it sounds, but it's definitely a message you don't want to ignore. Think of it as your car trying to tell you, "Hey, something's up with my gears, but I'm not going to tell you exactly what yet."
What Is P0700, Anyway? The Messenger Code
Here's the deal with P0700: it's not actually telling you about a specific problem in your transmission. Instead, it's what we call a "messenger code." The full, fancy name is "Transmission Control System (TCM) Malfunction Indicator Lamp (MIL) Request." Yeah, it's a mouthful, right?
In plain English, what that means is your car's Transmission Control Module (TCM) – that's the computer that manages your transmission's operations, like when to shift gears – has detected a fault within itself or with one of its components. And when it finds a fault, it sends a signal to the Engine Control Module (ECM) or Powertrain Control Module (PCM), which is the main brain for your engine, basically saying, "Hey chief, I found a problem down here. You need to turn on the Check Engine Light so the driver knows something's wrong." So, P0700 is essentially the TCM calling the PCM and saying, "Sound the alarm!"
It's a lot like getting a voicemail from a friend saying, "Call me back, it's important!" You know there's an issue, but you don't know if it's a flat tire, a leaky faucet, or something even bigger until you actually talk to them. P0700 is that voicemail.
Why P0700 Isn't Enough: The Need for Deeper Digging
This is the absolutely critical part that many DIYers (and even some less-experienced shops) miss. If you just scan your Chrysler with a basic OBD-II scanner and all you see is P0700, you've only got half the story. You haven't actually found the root cause of the problem.
Imagine again that friend leaving you a message. You wouldn't just sit there and worry about the message itself, would you? You'd call them back to find out what's really going on. It's the same with your car. The TCM is holding the actual trouble codes – the specific "P07xx," "P08xx," or even some manufacturer-specific "P1xxx" codes that tell you precisely what component is failing or what circuit has a fault.
These hidden codes could be anything from: * A faulty transmission speed sensor (P0715, P0720). * A problem with a shift solenoid (P0750, P0755, etc.). * Torque converter clutch issues (P0740, P0741). * Incorrect gear ratios detected (P0731 through P0736). * A transmission fluid temperature sensor acting up (P0710). * Even something like low transmission fluid pressure.
Without those specific secondary codes, you're essentially just guessing, and trust me, guessing with transmission problems can get expensive real fast.
Symptoms You Might Be Experiencing
While P0700 itself doesn't point to a specific symptom beyond the Check Engine Light, the underlying issue certainly will. If your TCM has decided to throw this code, you're probably noticing some less-than-ideal driving characteristics. These can vary wildly depending on what the actual problem is, but common complaints include:
- Check Engine Light: This is a given, of course.
- Harsh or Delayed Shifts: Your transmission might be slamming into gear, or taking an unusually long time to engage.
- Transmission Slipping: You might feel the engine revving higher than usual without the car actually accelerating much, or feel a "surge" as it tries to find the right gear.
- Limp Mode: This is your car's self-preservation mechanism. It'll lock the transmission into a higher gear (often 2nd or 3rd) to prevent further damage. You'll notice significantly reduced power and probably won't be able to shift manually.
- No Engagement in Drive or Reverse: The absolute worst-case scenario where the transmission just won't engage.
- Poor Fuel Economy: The transmission isn't operating efficiently, so your MPG will suffer.
- Strange Noises: Clunks, whines, or grinding sounds coming from the transmission area.
If you're experiencing any of these with a P0700 code, it's a definite sign you need to investigate further.
Your First Steps: DIY Checks (Before the Advanced Scan)
Before you panic and tow it straight to the most expensive transmission shop in town, there are a couple of things you, as a vigilant car owner, can do. These are basic checks, but they can sometimes point you in the right direction or rule out simple issues.
Check Your Transmission Fluid
This is honestly the first thing you should do. It's free and easy. * Level: Make sure the fluid is at the correct level, checking it according to your owner's manual (some are checked warm, some cold, some with the engine running, some off). Low fluid can cause all sorts of shifting problems and codes. If it's low, look for leaks! * Color: Healthy transmission fluid is usually bright red or pinkish. If yours is dark brown or black, that's a sign of old, worn-out fluid. * Smell: Give it a sniff. Does it smell burnt? A strong, acrid burnt smell often indicates internal transmission damage and overheating. Milky or foamy fluid can indicate water contamination.
Visual Inspection
Pop the hood and take a look around the transmission area. * Leaks: Are there any obvious fluid leaks around the transmission pan, lines, or seals? * Wiring: Check for any visible damage to wiring harnesses that connect to the transmission. Look for chafed wires, loose connectors, or corrosion. Sometimes a simple loose connection can throw a whole slew of codes.
While less likely to directly cause a P0700, a dying battery or charging system can sometimes throw weird, unrelated codes. It's always a good idea to ensure your battery is strong, especially in older vehicles.
The Real Solution: An Advanced Scan Tool
Alright, so you've done the basic checks, and nothing immediately jumped out at you, or you found something but want confirmation. Now it's time to get serious. This is where a standard, cheap OBD-II code reader won't cut it. You need a scanner that can communicate with Chrysler's specific modules, particularly the TCM.
Many entry-level scanners only read codes from the Engine Control Module (ECM/PCM). To get to the bottom of a P0700, you need a scanner that can perform "enhanced diagnostics" and "read all modules." These types of scanners are often a bit more expensive, but they're invaluable for serious DIYers or if you want to avoid paying a shop solely for diagnosis.
Once you have the right tool, connect it, and dive into the TCM codes. Those are the ones that will tell you what's actually going on. Write them down! Then, you can research those specific codes to understand the precise component or system that's having trouble.
Common Underlying Causes (and What They Mean)
Once you've got those specific TCM codes, you'll be able to narrow down the culprits. Here's a quick rundown of some common issues that can trigger P0700:
- Low/Contaminated Fluid: As we discussed, this is huge. Always start here.
- Faulty Speed Sensors: If the transmission can't accurately tell how fast its input or output shafts are spinning, it gets confused and can't shift correctly.
- Bad Shift Solenoids: These little electrical valves direct fluid flow to engage different gears. If one sticks or fails, your transmission won't shift properly or at all.
- Valve Body Issues: The valve body is like the central nervous system of your transmission, with many tiny passages and valves. Debris or wear can cause issues here.
- Wiring/Connector Problems: A broken wire or corroded pin in a connector can interrupt signals between the TCM and transmission components.
- TCM Failure: While rarer, the Transmission Control Module itself can fail. This is usually an expensive fix.
- Internal Mechanical Failure: This is the big, scary one. Worn clutch packs, broken bands, or other hard part failures usually mean a transmission rebuild or replacement.
- Torque Converter Issues: Problems with the torque converter (which connects the engine to the transmission) can mimic shifting issues.
When to Call the Pros
If you've done your basic checks, perhaps even invested in an advanced scanner, and you've pulled the specific TCM codes but you're still not confident in diagnosing or tackling the repair, it's absolutely okay – and often smart – to call in a professional. Transmission work can be intricate, messy, and require specialized tools.
A good mechanic will: 1. Verify the P0700 and any underlying codes with their own professional scanner. 2. Perform a thorough visual inspection and fluid check. 3. Test relevant components (solenoids, sensors) using their diagnostic equipment. 4. Conduct a road test to observe real-world shifting behavior. 5. Pinpoint the exact cause and give you repair options.
Keep It Healthy: Prevention is Key
Like most things with cars, regular maintenance can go a long way in preventing headaches. * Regular Fluid Changes: Follow your Chrysler's recommended transmission fluid change intervals. Don't skip them! This is probably the single most important thing you can do. * Use the Right Fluid: Always use the specific type of transmission fluid recommended by Chrysler for your vehicle. Using the wrong type can cause serious problems. * Address Leaks Promptly: Don't ignore small drips. A little leak can quickly become a big, expensive problem. * Avoid Over-Stressing: Don't regularly tow heavier loads than your vehicle is rated for, and try to avoid aggressive driving that puts undue stress on the transmission.
The Takeaway
So, when that P0700 code pops up on your Chrysler, Dodge, or Jeep, don't just clear it and hope it goes away. It's a critical warning from your Transmission Control Module. It means, "I've found a problem, and I need you to look deeper." Get an advanced scanner, find those underlying codes, and tackle the issue head-on. Whether you're a seasoned DIYer or taking it to a trusted shop, understanding what P0700 really means is your first step towards a healthy, smooth-shifting ride again. You've got this!