You can check the pan for debris while you're in there. If I were you, I would replace the valve body assy. The good news is that 68RFE service valve bodies are now anodized, which alleviates the SSV wear problem. So I suspect that may be related to any SSV problem. P0740 is the TCC Out of Range fault, which means the TCC could not properly engage. Your worn SSV bore might be making it difficult for the SSV to stay fully in the TCC position. It routes oil from the LR solenoid to either the LR clutch (in 1st gear) or the TCC (in 2nd thru 6th gears). Not only that, but the SSV is part of the torque converter clutch (TCC) circuit. This is by far the most prevalent fault caused by a worn SSV bore. P0871 is the OD Pressure Switch Rationality fault, which means that the OD pressure switch was in the wrong state (open when it should be closed, or vice versa). This allows oil to leak in and out of the OD clutch passage. Get a quote and book an appointment online or speak to a service advisor at 1-80.Click to expand.Joe, with 200K on the trans you likely have a worn out solenoid switch valve (SSV) bore in the main valve body. YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Also, be aware that control modules can fail, such as the PCM, but it is not a common reason for this code to appear. Checking the PCM is important as this could also be the issue, though it is rare.Īdditional comments for consideration regarding the P0870 codeĭon't rush to replace the sensor when it could be a transmission leak.If it is within the manufacturer's guidelines, test the ground and resistance. If the code persists, the transmission temperature sensor must be unplugged and tested for its reference voltage.Visually examining the wiring and replacing or repairing anything that is corroded, melted, shorted, or disconnected is necessary. Retesting after transmission repairs is necessary and if the code returns, a diagnosis of the electrical circuitry for the sensor is needed.If the fluid smells very burnt before the inspection and the code is set, it could be that a new transmission is needed. Perform a full transmission inspection and diagnostic to be sure that any leaks are repaired and that the right amount of fluid is in the tank.To overcome and repair the P0870 code, a mechanic must: This code should not be taken lightly because it may mean a much costlier repair down the road. Mistaking it for low fluid levels, rather than a full-blown leak is a common blunder. The P0870 code is very serious because it can easily lead to the destruction of the transmission. Only when the transmission has been assessed fully and repaired should the diagnostics on the sensor be performed. This is why the first step is always to do a thorough diagnostic on the transmission to be sure that high temperatures have not damaged it internally. The P0870 code can cause many mistakes because it may lead to a technician feeling that the only problem is a transmission leak. Common mistakes when diagnosing the P0870 code Unplugging the electrical connector and testing the sensor for voltage is also part of the process and if it is not in compliance, it may need to be replaced. The technician will use the scanner to diagnose any electrical issues with the system and examine the wiring, repairing and replacing components when needed. Once they check the transmission, they can reset the fault codes and test the vehicle to see if the code reappears. The technician should also look at freeze frame determine when and where (in the order of events) the code was set. Though the P0870 is diagnosed with an OBD-II scanner, one of the very first steps is to check the transmission before doing any other diagnostics as this may be the source of the code. How does a mechanic diagnose the P0870 code? Drivers will experience transmissions that slip out of gear or which are impossible to put into gear and use. Most mechanics or technicians also say that a major sign that this code is going to appear is the smell of the transmission fluid as it overheats, and the smoke that may appear. The P0870 code triggers the code and also the service engine light. Defective transmission (also called a slipping transmission).There are several reasons that the P0870 can occur: The P0870 is an OBD-II generic code and it will occur if transmission fluid increases or decreases to a level that is not within the programmed limits. A P0870 code indicates that the powertrain control module (PCM) has determined that the pressure of the transmission fluid is not within the desired range.
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