What Is the P0796 Code?
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The P0796 code is the Diagnostic Trouble Code (DTC) that comes on when there’s an issue with the transmission pressure control solenoid C. This code is stored in the vehicle’s onboard diagnostic system when the Transmission Control Module (TCM) detects a malfunction in the hydraulic circuits of the transmission system related to the pressure control solenoid C.
More About Error Code P0796
The P0796 code is an OBD-II trouble code that lets you know there’s a problem with the transmission pressure control solenoid C. The code specifically refers to a performance issue or stuck-off condition of the pressure control solenoid valve C. It’s generally set when the PCM detects an abnormal reading in the hydraulic pressure of the transmission line.
The transmission pressure control solenoid C is an electronic valve that regulates the hydraulic pressure in the transmission. It is controlled by the Transmission Control Module (TCM). The solenoid adjusts the pressure according to the actual gear and the transmission gear ratio. This helps the transmission to maintain proper hydraulic pressure, which prevents transmission damage.
The pressure control solenoid is relatively sensitive and may be affected by a wide range of factors, including, a clogged transmission filter, dirty transmission fluid, a faulty transmission pump, defective transmission valve body, excessive debris or foreign material in the fluid passages, or hydraulic circuits.
When these issues arise and the Powertrain Control Module (PCM) detects a fault in the solenoid, it tries to protect the transmission by entering fail-safe or limp mode and triggering the check engine light. Unfortunately, limp mode significantly limits the vehicle’s performance, decreasing the engine power and acceleration time.
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What Are the Symptoms of a P0796 Code?
Different car models may exhibit different symptoms depending on the specifications of their transmissions. However, the following are some of the universal symptoms of a P0796 code:
- Erratic shifts – Where the transmission shifts are too harsh or shift too late or too early.
- Engine stalls – The engine may stop suddenly when you try to stop the vehicle, or as you’re shifting gears.
- Engine misfires – The engine may regularly and annoyingly misfire, causing a loss of power, poor fuel economy, or rough idling.
- Check engine light – Like most OBD-II codes, a check engine light will illuminate as long as the P0796 code is active.
- Limp mode – This involves limited power and speed, slower acceleration, rough shifting, and the inability to change gears.
What Are Some Causes of a P0796 Code?
A P0796 code can be caused by any or several of the following factors:
- Faulty pressure control solenoid C
- Dirty transmission fluid
- Clogged transmission filter
- Defective transmission valve body
- Faulty transmission pump
- Damaged wiring or connectors
How Serious Is the P0796 Code?
A P0796 fault code is an extremely serious problem because it affects the transmission control system. The transmission is the backbone of an automatic vehicle, and when it malfunctions, the effects can be costly. For instance, a P0796 code can result in mechanical transmission failure, clutch pack damage, or engine damage. As such, it should be addressed promptly.
Can I Still Drive with a P0796 Code?
You are advised not to drive with a P0796 code. This is because the car will have shifting problems and also misfire and stall at the worst possible moments. If you keep driving, the result may be a mechanical transmission failure or clutch pack damage. Additionally, erratic shifting by the transmission may place a big load on the engine, causing it to overheat or wear out faster.
Essentially, the longer you keep driving with a P0796 code on, the higher your inspection and component replacement costs will be.
How Easy Is It to Diagnose a P0796 Code?
You need extensive auto repair skills to properly and accurately diagnose the problem. To be on the safe side, book an appointment for diagnosis with a reputable auto repair shop or transmission rebuilder as soon as you notice the symptoms of the problem.
At an automobile repair shop, the technicians will retrieve the code via an OBD-II scanner, which helps to get the exact code definition for your car. They will then check the transmission fluid level, hydraulic pressure, and actual gear ratio against normal readings.
If no issue is detected, the technicians will proceed to inspect the transmission fluid for signs of metal particles, excessive debris, or foreign material. They will also test the solenoid itself and the converter clutch circuit for proper electrical function.
Being a straightforward problem, a code P0796 may cost just an hour of labor, or two, unless there are additional trouble codes. Depending on the shop you go to, you may even get advanced Automotive Service Excellence (ASE) repair advice as part of the package.
How Difficult Is It to Inspect a P0796 Code?
Inspecting and fixing a P0796 code can be a complex and challenging process, depending on the underlying cause. As such, there are no standard auto repair labor rates and you may find yourself paying way more, or way less than you expected. Here are some of the inspection procedures that your mechanic may undertake:
- Replace the transmission pump, the transmission control module, or the electronic pressure regulator
- Replace the transmission fluid or filter, or flush the transmission
- Replace the transmission entirely if the code was triggered by mechanical transmission failure
- Fix any loose or poor connections in the electrical circuit
- Replace the solenoid if it is faulty
Need Additional Help with Your P0796 Code?
If you need further assistance with diagnosis or inspecting your P0796 code, use KBB.com to discover a reputable auto repair shop in your region and have your car repaired by automotive experts.
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