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Transmission code, P1745
In transmissions with electronic shift controls, power is supplied to the transmission control module through the transmission control output circuit. If the vehicle experiences a problem that requires the transmission to be put into limp mode, the transmission control output circuit voltage changes.
The transmission will engage in low gear as a self-protective measure and will not shift. When the engine is started or the key is turned to the run position, the transmission control module performs a system check. It looks for voltage on the transmission control circuit.
If the circuit is open, it requests the transmission control circuit to be powered up from the PCM. In most vehicles, if the DTC is active the transmission will engage limp mode and will not shift. Because DTC P is primarily related to an electronic shift control issue, low battery voltage can cause the code to set. Before beginning any in-depth electronic diagnosis, check that the battery voltage is proper. A telltale sign that the battery is weak and may be causing DTC P is if you require a boost to start the engine.
Alternatively, perform a load test on the battery. Many auto parts retailers will perform out-of-vehicle load testing on batteries for no charge. If the load test fails, replace your battery. Clear the DTC with a code reader. If the code returns, continue with diagnosis. Locate the transmission control circuit for your vehicle at the PCM connector. You will need a wiring diagram specific to your make and model for accurate diagnosis, which you may be able to get printed from a parts retailer.
The transmission control circuit should read 5. If the resistance is less than 5. Trace the circuit while monitoring the resistance, wiggling the wire and checking for breaks or rubbed sections in the wire. If you detect a change in resistance while wiggling a section, perform a repair on the wire, clear the codes and retest.
Using a DVOMcheck the transmission control circuit resistance in the same way as checking for a short to ground.Engine-Codes - Generic - P P Possible Causes What does this mean? How is the P code repair? Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors.
Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins. What is the cost to diagnose the P code Labor: 1. The auto repair labor rates vary widely across the country, and even within the same city. P Meaning The P code is an informational code to inform the technician that transmission has been operating in an open-loop line pressure control for kilometers miles or upshifts resulting from a Line Pressure DTC.
The Transmission is not designed to operate in open-loop line pressure control for an extended period time. This code is intended to protect the transmission.
P0882 – Transmission control module (TCM) -power input signal low
If the P code sets, the transmission controller will place the transmission into limp-in mode. More Information Need more information on how to fix the P code? Get Access to Factory Service Manuals. Need more help? Get the P code diagnosed by a professional: Find a repair shop in your area.
Why is the Engine Light ON? Repair Importance Level: 3.We recommend Torque Pro. Diagnosing this code accurately beyond the basic steps outlined here almost always requires advanced diagnostic equipment such as transmission simulators and sometimes oscilloscopesabove average diagnostic skills in general, and expert-level knowledge of automatic transmissions and their control systems, in particular.
Non-professional mechanics are strongly urged NOT to continue the diagnostic steps beyond what is presented here; doing so could cause irreparable damage to the transmission as well as the entire electrical system of the application.
However, this pressure is not constant across all gears; the desired pressure for a particular gear is calculated by the Transmission Control System, using measured engine torque as the primary input data, which is supported by input data from various engine and transmission sensors.
Pressure variation and regulation is accomplished by varying the duty cycle of the Pressure Control Solenoid.
In practice, the transmission line pressure is set to a predefined range. In a fully functional transmission, the actual pressure is both continuously monitored by a dedicated line pressure sensor, and compared to the desired pressure.
NOTE: Take note that if the transmission had become noisy at about the same time code P appeared the transmission had already suffered severe mechanical damage, and trying to resolve this code at this point is a waste of time and money.
P1745 - Line Pressure Too High For Too Long
If the transmission is noisy the only viable option is to replace the transmission. Record all fault codes present, as well as all available freeze frame data. This information can be of use should an intermittent fault be diagnosed later on.
Refer to the manual to locate the pressure control harness, but be sure to determine the color coding and function of each wire in the harness to avoid testing the wrong circuit. Perform a thorough visual inspection of all associated wiring and connectors, and look for damaged, burnt, shorted, disconnected, or corroded wiring and connectors. Make repairs as required if damage is found. Compare all obtained readings with the values stated in the manual, and repair or replace wiring as required to ensure that all electrical values fall within the ranges specified by the manufacturer.
NOTE 1: Pay particular attention to the internal resistance of both the pressure control solenoid, and the line pressure sensor since resistance is a reasonably good indicator of their overall condition.
Take note that if the fault persists beyond Step 3, the better option is to refer the vehicle to the dealer or other competent repair facility for professional diagnosis and repair. This site uses Akismet to reduce spam. Learn how your comment data is processed. Skip to content. Most reacted comment. Hottest comment thread. Recent comment authors. Notify of. Previous Post Previous P — Four wheel drive switch -circuit malfunction. Next Post Next P — Transmission gate select position circuit -intermittent circuit malfunction.Check the "Possible Causes" listed above.
Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. When is the code detected? The P code is detected if there is an excessive change in the output rpm in any gear. By comparing the input turbine speed signal NT with the counter gear speed sensor signal NCthe Engine Control Module ECM detects the shift timing of the gears and appropriately controls the engine torque and hydraulic pressure according to various conditions.
Thus, providing smooth gear shift. Get Access to Factory Service Manuals.62TE Common Problems
Need more help? Get the P Chrysler code diagnosed by a professional: Find a repair shop in your area. Why is the Engine Light ON? Comments Help us improve AutoCodes. Leave a comment below or tell us if the information above help you fix the code. What are the symptoms on your vehicle for the P Chrysler code? Have you replaced any parts? Any information is appreciated. Repair Importance Level: 3. Home - About AutoCodes. Posted and Edit by AutoCodes.Got a p code in my van and it is in limp mode.
It will not shift or go above forty. It says line pressure with an open loop. Just wanted some ideas on what might be the problem. Do you. Good morning. Description below.
The line pressure is too high. Diagnostics below as well. You will need an advanced scan tool to monitor the system for the tests. No common issue. Every one is different and needs to be checked. It is possible the pressure switch or sensor is the issue.
The valve body in the transmission needs to be removed to access these items. Will you be attempting this repair yourself? Diagrams below Theory of Operation This DTC is an informational DTC to inform the technician that transmission has been operating in an open-loop line pressure control for kilometers miles or upshifts resulting from a Line Pressure DTC. The 62TE Transmission is not designed to operate in open-loop line pressure control for an extended period time.
This DTC is intended to protect the transmission. If the DTC sets, the transmission controller will place the transmission into limp-in mode.
View repair Repair - Perform the appropriate diagnostics. Remove the clamp plate bolts and clamp plate. Remove the electrical connectors to the pressure control solenoid and line pressure sensors.
Check out the diagrams Below. Please let us know if you need anything else to get the problem fixed.That means the computer has detected a problem with the transmission and will not allow it to shift out of second gear in order to prevent further damage to the transmission. To diagnose, follow these instructions. First, check for transmission related trouble codes in the computer. You can read any of these codes with an inexpensive code reader.
The problem is usually caused because the Transmission Control Module TCM cannot determine the input or output shaft speed. Connect your scan tool and start the engine, leaving the transmission in PARK. This should be logical; the engine turns the torque converter at the same speed as the engine and the Input Shaft sensor is clocking the speed of the torque converter. If that checks out, drive the vehicle slowly and watch the speed of the Output Shaft Sensor.
It should rise slowly, corresponding to your vehicle speed. If either sensor is off or completely dead, replace it with a factory sensor.
You read that right, a genuine Chrysler part. You can also test the sensor with a digital ohm meter. It should read about ohms. Also, verify that the wiring harness and connectors are in good shape. Dodge Grand Caravan 3. Unlike the cheaper Haynes and Chilton manuals that cover multiple year models, leaving the exact information you need to fix your car, these professional manuals cover your exact year, make, model.
Plus, they contain full trouble code descriptions and troubleshooting instructions.
P0792 CHRYSLER - Intermediate Shaft Speed Sensor 'A' Circuit Range/Performance
Pricing: Eautorepair. So you have to refer to the factory legends to learn the identification symbols and then refer back to circuit diagrams to find the splice and ground locations. However, Alldatadiy. If you need to dig into your doors, dash or console, Alldatadiy.
Find this article useful?This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic.
A P trouble code indicates that an abnormality has been detected in the gear ration of one of the automatic transmissions gears, causing the storage of a code in the Powertrain Control Module PCM and illumination of the Check Engine Light. Utilizing the position of the throttle, engine load and speed, as well as vehicle speed, the vehicle computer determines the appropriate gear to shift into to maintain the desired speed and power in an automatic transmission.
The P trouble code develops when there is a problem shifting into fourth gear specifically. And when this data does not match up, a P trouble code is stored.
The causes of a P trouble code include a faulty PCM, ECM, or TCM; blockage inside the transmission; a faulty shift solenoid, dirty or contaminated transmission fluidor a low transmission fluid condition, and a mechanical transmission failure.
Symptoms of a P trouble code range from the failure of the transmission to shift into a particular gear to no apparent malfunction. The vehicle could also suffer from the transmission slipping and overheating, a decrease in fuel efficiencyand other gear ratio codes being stored on the PCM in addition to the original code.
In addition, the mechanic should perform the following steps when attempting a diagnosis:. The mechanic should begin the diagnosis by checking the transmission fluid level and condition. While inspecting the fluid, the mechanic should be on the lookout for a burnt or abnormal smell, which can indicate that the transmission has suffered damage from a low fluid condition.
If this is the case, the mechanic should remove the transmission pan and inspect it for pieces of the clutch or other debris. If the wiring and connectors appear to be in good shape, then they should connect the OBD-II scanner to the diagnostic connector and download any stored trouble codes and freeze frame data.
Additionally, if the transmission fluid is low, the mechanic should fill the transmission fluid to a point that any leaks can be detected and repaired. Once all leaks are found and fixed, the transmission fluid must be filled to an appropriate level.
The mechanic should clear the code, allow the vehicle to reach a normal operating temperature, and test drive the vehicle to see if the trouble code returns. If the code returns and the transmission is still slipping or hesitating, the mechanic should connect a manual pressure gauge. Using the manual pressure gauge in conjunction with a hydraulic pressure diagram, they should check the pressure of the transmission's hydraulic pump.
The mechanic should compare their findings to manufacturer specifications. They need to then check for circuit continuity, making sure to disconnect any related control modules to prevent memory loss. Furthermore, the mechanic should use a manufacturer's wiring diagram to test all related circuits for resistance and continuity, comparing their findings to the manufacturer's specifications. If everything checks out and is in good condition, the next step is to diagnose the PCM for failure.
Finally, once all repairs are made, the mechanic should clear the code and retest the system to see if the trouble code returns. A common misdiagnosis by a mechanic is to blame the shift solenoid and replace that component. Ultimately, this does not fix the problem and the condition returns. The condition that causes the storage of a P trouble code, if left untreated, can lead to the transmission failure, worsening fuel mileage, and trouble shifting while driving.
Fixing and clearing a P trouble code is a multi-step process and requires the mechanic to perform the following:. If upon inspection it is determined that the transmission has suffered damage due to a low fluid condition, the mechanic must first rebuild the transmission, perform a fluid flush, and replace the torque converter, before the transmission will perform properly.
If a rebuild and flush does not fix the problem, the problem might lie with the wiring or connectors. In this case, the mechanic should replace any damaged, or faulty, wiring or connectors.
Most often, if damaged components are detected during this inspection, the full internal transmission harness needs replacing. The mechanic should repair any leaks if the transmission fluid looks like it is in good condition and is only low.
In addition, the mechanic should replace the hydraulic pump if this component is damaged.