G solenoid is a normally-closed (N/C) solenoid used to modulate the transmission main pressure. Under specific conditions, low throttle setting, low engine torque, low engine speed, and low transmission output speeds, the transmission control module (TCM) commands the G solenoid on.
When G solenoid is applied, fluid is routed to the main pressure regulator valve; this in turn reduces the main pressure schedule and improves the volume of oil through the overage circuit. By modulating main pressure, cooler flow at idle can be increased allowing improved cooling and reducing transmission pump noise.
DTC P2810 is a type B DTC.
This diagnostic procedure supports the following DTC:
DTC P2810 Solenoid G Electrical
• | The components are powered and ignition voltage is greater than 9.0 volts and less than 18 volts. |
• | TCM initialization is in process or engine speed is greater than 200 RPM and less than 7,500 RPM for 5 seconds. |
• | The TCM must auto-detect G solenoid. |
DTC P2810 is set when the TCM detects an open circuit, short to ground, or short to power at G solenoid circuit for greater than 2 seconds.
• | The TCM illuminates the malfunction indicator lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met. |
• | DTC P2810 will be stored in TCM history. |
A scan tool can clear the code from TCM history. The TCM automatically clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without failure.
• | Inspect the wiring for poor electrical connections at the TCM. Inspect for the following conditions: |
- | A bent terminal |
- | A backed-out terminal |
- | A damaged terminal |
- | Poor terminal tension |
- | A chafed wire |
- | A broken wire inside the insulation |
• | When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change. |
• | You may have to drive the vehicle in order to experience a condition. |
• | Solenoids are sensitive to battery voltage spikes and poor ground connections. |
The numbers below refer to the step numbers on the diagnostic table.
This step tests ignition voltage.
This step tests the command signal from the TCM.
This step tests the resistance value of the external harness and solenoid.
This step tests the resistance value of the solenoid, and tests the internal wiring harness for open/shorts.
This step tests the resistance value of the solenoid.
Step | Action | Value | Yes | No |
---|---|---|---|---|
Schematic Reference: Automatic Transmission Controls Schematics | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
Important: Before clearing the DTC, use the scan tool in order to record the Freeze Frame and Failure Records for reference. The Clear Info function will erase the data. Is the voltage within the specified range? | 9-18 V | Go to Step 3 | Go to DTC P0562 for low voltage or DTC P0563 for high voltage | |
Is the voltage within the specified value when G solenoid is commanded ON. | B+ | Go to Step 4 | Go to Step 10 | |
Is the resistance reading within the specified value? | 22.0 ohms @ 20°C (68°F) | Go to Diagnostic Aids | Go to Step 5 | |
Is the resistance within the specified value? | 22.0 ohms @ 20°C (68°F) | Go to Step 6 | Go to Step 7 | |
Inspect the engine wiring harness circuit for an open or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct a condition? | -- | Go to Step 11 | -- | |
7 |
Is the solenoid resistance within the specified value? | 22.0 ohms @ 20°C (68°F) | Go to Step 8 | Go to Step 9 |
8 | Replace the AT internal wiring harness. Refer to Wiring Harness Replacement . Did you complete the replacement? | -- | Go to Step 11 | -- |
9 | Replace G solenoid. Refer to Control Valve Solenoid Replacement . Did you complete the replacement? | -- | Go to Step 11 | -- |
10 |
Important: In most cases, the TCM is not at fault. Investigate thoroughly before replacing the TCM. Replace the TCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 11 | -- |
11 | Perform the following procedure in order to verify the repair:
Has the test run and passed? | -- | System OK | Go to Step 1 |