Engine-Codes - GMC - P0872 GMC

P0872 GMC Code - Transmission Fluid Pressure Switch 3 Circuit Low Voltage

- Code Popularity: 7,977 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the Code P0872 GMC?

  • Low transmission fluid level
  • Dirty transmission fluid
  • Faulty Transmission Control Solenoid Valve Assembly
  • Transmission Control Solenoid Valve Assembly harness is open or shorted
  • Transmission Control Solenoid Valve Assembly circuit poor electrical connection
  • Faulty Transmission Control Module (TCM)

|How to Fix the P0872 GMC Code?

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.

|Code P0872 GMC Tech Notes

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|What is the Cost to Diagnose the Code P0872 GMC?

Labor: 1.0

The cost to diagnose the P0872 GMC code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

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|What are Code P0872 GMC Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Transmission will not shift gears.

|What Does the P0872 GMC Code Mean?

The transmission fluid pressure switch, also known as the pressure switch manifold, is a multiple switch assembly made up of 3 normally open pressure switches and 1 normally closed pressure switch. Pressure switch 1 monitors shift valve 1 positioning, pressure switch 2 monitors shift valve 2 positioning, pressure switch 3 monitors shift valve 3 positioning, and pressure switch 4 monitors the position of the manual selector valve. The TCM provides a signal circuit to each of the pressure switches. The TCM constantly monitors the circuits to determine the position of the shift valves. The position of shift valves 1, 2, and 3 is controlled by 3 normally closed shift solenoids. When energized, shift solenoid 1 directs fluid pressure to shift valve 1, shift solenoid 2 directs fluid pressure to shift valve 2, and shift solenoid 3 directs fluid pressure to shift valve 3, which strokes the shift valves. When a shift valve is stroked, an exhaust passage is blocked and fluid pressure increases, closing the normally open pressure switch. The Diagnostic Trouble Code (DTC) will be set when the TCM detects that pressure switch 3 is Low when shift solenoid valve 3 is commanded OFF for 1 s.

P0872 GMC Code - Transmission Fluid Pressure Switch 3 Circuit Low Voltage

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