Hummer H2. Manual — part 2469

LACK OF POWER OR HESITATION

Lack of Power or Hesitation

Low and Reverse Clutch Piston (695)

Cut or damaged inner, outer or center clutch seals

Reverse Input Clutch Piston Assembly (607)

Cut or damaged inner or outer clutch seals

Pump Cover (215)

Cut or damaged oil seal rings - stator shaft

Checks

Causes

Automatic Transmission Fluid Pressure
(TFP) Manual Valve Position Switch
(69)

Incorrect TFP signal logic for current gear position. Refer to
Transmission Fluid Pressure (TFP) Manual Valve Position
Switch Logic .

2004 Hummer H2

2004 TRANSMISSION Automatic Transaxle - 4L60-E/4L65-E (Troubleshooting)

2004 TRANSMISSION

Automatic Transmission - 4L60-E/4L65-E Diagnosis (DTC P0218 To DTC P2771) - Hummer H2

AUTOMATIC TRANSMISSION (DTC P0218 TO DTC P2771)

DTC P0218

Fig. 1: Filter, Control Valve Body Assembly, Transmission Case & Oil Pump Assembly
Courtesy of GENERAL MOTORS CORP.

Circuit Description

The flow of transmission fluid starts in the bottom pan and is drawn through the filter, control valve body
assembly, transmission case and into the oil pump assembly. The oil pump assembly pressurizes the fluid and
directs it to the pressure regulator valve where it becomes the main supply of fluid to the various components
and hydraulic circuits in the transmission. Hot fluid exiting the torque converter flows through the converter

2004 Hummer H2

2004 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E Diagnosis (DTC P0218 To DTC P2771) - Hummer H2

2004 Hummer H2

2004 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E Diagnosis (DTC P0218 To DTC P2771) - Hummer H2

clutch apply valve and into the transmission cooler lines to the oil cooler located in the vehicle radiator, and
auxiliary cooler if equipped. From the cooler, fluid returns to cool and lubricate the front of the transmission. In
forward drive ranges, D4 fluid from the manual valve is routed through an orificed cup plug in the rear of the
transmission case to feed the rear lube fluid circuit.

When the powertrain control module (PCM) detects a high transmission fluid temperature (TFT) for a long
period of time, then DTC P0218 sets. DTC P0218 is a type C DTC.

Conditions for Running the DTC

z

No TFT sensor DTCs P0711, P0712 or P0713.

z

The ignition switch is ON for 5 seconds.

Conditions for Setting the DTC

The TFT is greater than 130°C (266°F) for 600 seconds (10 minutes).

Action Taken When the DTC Sets

z

The PCM does not illuminate the malfunction indicator lamp (MIL).

z

TRANS HOT...IDLE ENGINE message displays on the driver information center (DIC).

z

The PCM freezes transmission adapt functions.

z

The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM
stores this information as Failure Records.

z

The PCM stores DTC P0218 in PCM history.

Conditions for Clearing the DIC/DTC

z

The PCM clears the DIC message when the condition no longer exits.

z

A scan tool can clear the DTC.

z

The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without a non-
emission-related diagnostic fault occurring.

z

The PCM cancels the DTC default actions when the fault no longer exists and/or the ignition switch is
OFF long enough in order to power down the PCM.

Diagnostic Aids

z

The scan tool Trans. Fluid Temp. should rise steadily to a normal operating temperature, then stabilize.

z

Ask about the customer's driving habits, trailer towing, etc. Trailer towing should occur in D3.

Refer to Symptoms - Automatic Transmission .

Test Description

The numbers below refer to the step numbers on the diagnostic table.

2004 Hummer H2

2004 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E Diagnosis (DTC P0218 To DTC P2771) - Hummer H2

3: This step inspects for air flow restrictions or damage which may result in the transmission overheating.

DTC P0218

Step

Action

Value

(s)

Yes

No

1

Did you perform the Diagnostic System
Check - Engine Controls?

-

Go to Step 2

Go to Diagnostic

System Check - Engine

Controls in Engine

Controls - 6.0L (LQ4)

2

1. Install a scan tool.

2. Turn ON the ignition, with the engine

OFF.

3. Record the DTC Failure Records.

4. Clear the DTC.

5. Inspect for correct transmission fluid

level.

Refer to Transmission Fluid
Checking Procedure .

Did you perform the fluid checking
procedure?

IMPORTANT:

Before clearing the DTC, use the
scan tool in order to record the
Failure Records. Using the Clear
Info function erases the Failure
Records from the PCM.

-

Go to Step 3

Go to Transmission

Fluid Checking

Procedure

3

1. Inspect the engine cooling system and

transmission cooling system for the
following conditions:

z

Air flow restrictions

z

Air flow blockage

z

Debris

2. Inspect the transmission cooling

system for damaged cooler lines.

3. Test the oil cooler flow.

Refer to Automatic Transmission
Oil Cooler Flushing and Flow Test
(J 45096) or Automatic

-

2004 Hummer H2

2004 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E Diagnosis (DTC P0218 To DTC P2771) - Hummer H2