P2817 Pressure Regulator Solenoid H Perf / Off
OBD2 Error Codes

P2817 Pressure Regulator Solenoid H Perf / Off

P2817 Pressure Regulator Solenoid H Perf / Off

OBD-II DTC Datasheet

Pressure control solenoid valve H is running or stuck when switched off

What does this mean?

This is a Generic Transmission Diagnostic Trouble Code (DTC) and is commonly applied to OBD-II vehicles equipped with an automatic transmission.

This may include, but is not limited to, BMW, Toyota, Lexus, Nissan, Mitsubishi, Chevrolet, GMC, Mercedes-Benz, etc. Despite the general nature, the exact repair steps may vary depending on the year of manufacture, make, model and transmission configuration.

When the P2817 OBD-II DTC is set, the powertrain control module (PCM) detected a problem with the transmission pressure control solenoid "H". Most automatic transmissions have at least three solenoids, which are solenoids A, B, and C. However, the transmission contains even more for this DTC. Trouble codes related to the "H" solenoid are codes P2816, P2817, P2818, P2819 and P281A. The code set is based on a specific fault that alerts the PCM and turns on the check engine light.

The transmission pressure control solenoid valves control fluid pressure for proper automatic transmission operation. The PCM receives an electronic signal based on the pressure inside the solenoids. The automatic transmission is controlled by belts and clutches that shift gears by applying fluid pressure to the right place at the right time. Based on signals from associated vehicle speed control devices, the PCM controls the pressure solenoids to direct fluid at the appropriate pressure to various hydraulic circuits that change the transmission ratio at the right time.

Code P2817 is set by the PCM when the "H" pressure control solenoid is not working properly or is stuck in the "Off" position.

Example of a transmission pressure control solenoid: P2817 Pressure Regulator Solenoid H Perf / Off

What is the severity of this DTC?

The severity of this code usually starts at moderate, but can quickly progress to a more serious level if not corrected in a timely manner.

What are some of the symptoms of the code?

Symptoms of a P2817 trouble code may include:

  • The car goes into emergency mode
  • Transmission slips when shifting gears
  • Overheating of the transmission
  • Transmission stuck in gear
  • Reduced fuel economy
  • Possible misfire-like symptoms
  • Check Engine light is on

What are some of the common causes for the code?

Reasons for this P2817 transfer code may include:

  • Defective pressure control solenoid
  • Dirty or contaminated liquid
  • Dirty or clogged transmission filter
  • Defective transmission pump
  • Defective transmission valve body
  • Limited hydraulic passages
  • Corroded or damaged connector
  • Faulty or damaged wiring
  • Defective PCM

What are some steps to troubleshoot the P2817?

Before beginning the troubleshooting process for any problem, you should review the vehicle-specific Technical Service Bulletins (TSB) by year, model and transmission. In some cases, this can save you a lot of time in the long run by pointing you in the right direction. You should also check the vehicle records to check when the filter and fluid were last changed, if possible.

Checking fluid and wiring

The first step is to check the fluid level and check the condition of the fluid for contamination. Before changing the fluid, you should check the vehicle records to find out when the filter and fluid were last changed.

This is followed by a detailed visual inspection to check the condition of the wiring for obvious defects. Check connectors and connections for safety, corrosion and damage to pins. This should include all wiring and connectors to the transmission pressure control solenoids, transmission pump, and PCM. The transmission pump can be electrically or mechanically driven, depending on the configuration.

Advanced steps

Additional steps are always vehicle specific and require appropriate advanced equipment to be performed accurately. These procedures require a digital multimeter and vehicle-specific technical reference documents. You should receive specific troubleshooting instructions for your vehicle before proceeding with the advanced steps. Voltage requirements can vary greatly from vehicle model to vehicle. Fluid pressure requirements will also vary based on transmission design and configuration.

Continuity checks

Unless otherwise specified in the datasheet, normal wiring and connection readings should be 0 ohms of resistance. Continuity checks should always be performed with circuit power disconnected to avoid short circuiting the circuit and causing more damage. Resistance or no continuity indicates faulty wiring that is open or shorted and requires repair or replacement.

What are the standard ways to fix this code?

  • Replacing fluid and filter
  • Replace defective pressure control solenoid.
  • Repair or replace a faulty transmission pump
  • Repair or replace a faulty transmission valve body
  • Flushing transmission for clean passages
  • Cleaning connectors from corrosion
  • Repair or replacement of wiring
  • Flashing or replacing PCM

Possible misdiagnosis may include:

  • Engine misfire problem
  • Transmission pump problem
  • Internal transmission problem
  • Transmission problem

Hopefully the information in this article has helped point you in the right direction for solving your pressure control solenoid DTC problem. This article is for informational purposes only and specific technical data and service bulletins for your vehicle should always take priority.

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NOTE. This information is provided for informational purposes only. It is not intended to be used as a repair recommendation and we are not responsible for any action you take on any vehicle. All information on this site is protected by copyright.

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