Hummer H1 (2006+). Manual - part 88

OBD-196

On-Board Diagnostics

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DTC P0563 System Voltage High

Circuit Description

The transmission control module (TCM) requires ignition voltage to operate correctly. The voltage signal should be direct from the
ignition switch to avoid any interference.

DTC P0563 is a type C DTC.

Conditions for Setting the DTC

DTC P0563 sets when the TCM detects a voltage greater than 18 volts for 6 out of 10 seconds.

Action Taken When the DTC Sets

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

• The transmission fails to hydraulic default.

• DTC P0563 will be stored in TCM history.

• The TCM inhibits torque converter clutch (TCC) engagement.

• The TCM freezes shift adapts.

Conditions for Clearing the DTC

A scan tool can clear the code from TCM history. The TCM automatically clears the DTC from TCM history if the vehicle com-
pletes 40 warm-up cycles without failure.

Diagnostic Aids

• Inspect for the presence of aftermarket accessories, such as a remote starter, etc. Depending on how these aftermarket ac-

cessories are installed, they may interfere with the required voltage for proper operation of the transmission.

• 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.

Step

Action

Value(s)

Yes

NOTE: Before clearing DTC(s) use the scan tool “Capture info”
to record Freeze Frame and Failure Records for reference, as data
will be lost when “Clear Info” function is used

Was the “On-Board Diagnostic (OBD) System Check” per-
formed?

Go to step 2.

Go to OBD Sys-

tem Check.

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On-Board Diagnostics OBD-197

5745804

Install the scan tool.

Turn ON the ignition, with the engine OFF.

NOTE: 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.

Record the DTC Freeze Frame and Failure Records.

Clear the DTC.

Using a DVOM, measure and record voltage at the battery
terminals.

Is voltage within the specified value?

B+

Go to Step 3

Go to Step 4

Start the engine and observe the charge indicator on the instru-
ment cluster.

Does the charge indicator display voltage higher than specified
value?

18 Volts

Go to Step 5

Go to Step 6

Replace the battery, or resolve the battery condition.

Did you resolve the battery condition or replace the battery?

Go to Step 6

Repair the charging system.

Did you complete the repair?

Go to Step 6

Perform the following procedure in order to verify the repair:

Clear the DTC.

Using the scan tool, monitor TCM voltage.

Select Specific DTC.

Enter DTC P0563.

Has the test run and passed?

System OK

Go to Step 1

Step

Action

Value(s)

Yes

OBD-198

On-Board Diagnostics

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DTC P0601 Engine Control Module (ECM) Read Only Memory (ROM)

DTC P0602 Engine Control Module (ECM) Not Programed

DTC P0603 Engine Control Module (ECM) Long Term Memory Reset

DTC P0604 Engine Control Module (ECM) Random Access Memory (RAM)

DTC P1621 Engine Control Module (ECM) Long Term Memory Performance

DTC P2610 Engine Control Module (ECM) Ignition Of Timer Performance

Description

This diagnostic applies to internal microprocessor integrity conditions within the engine control module (ECM). This diagnostic
also addresses if the ECM is not programmed.

Conditions for Setting the DTC

These codes will set when there is incomplete programming or an internal failure within the ECM within 15 seconds.

Action Taken When the DTC Sets

DTC P0601, P0602, and P0604

• The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.

• The control module records the operating conditions at the time the diagnostic fails. The control module stores this informa-

tion in the Freeze Frame/Failure Records.

DTC P0603 and P1621

• The control module stores the DTC information into memory when the diagnostic runs and fails.

• The MIL will not illuminate.

• The control module records the operating conditions at the time the diagnostic fails. The control module stores this informa-

tion in the Failure Records.

• The driver information center (DIC), if equipped, may display a message.

DTC P2610

• The control module illuminates the MIL on the second consecutive ignition cycle that the diagnostic runs and fails.

• The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the

control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecu-
tive ignition cycle, the control module records the operating conditions at the time of the failure. The control module
writes the operating conditions to the Freeze Frame and updates the Failure Records.

Conditions for Clearing the MIL/DTC

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On-Board Diagnostics OBD-199

5745804

DTC P0601, P0602, P0604, and P2610

• The control module turns OFF the MIL after 3 consecutive ignition cycles that the diagnostic runs and does not fail.

• A current DTC, Last Test Failed, clears when the diagnostic runs and passes.

• A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related

diagnostic.

• Clear the MIL and the DTC with a scan tool.

DTC P0603 and P1621

• A current DTC, Last Test Failed, clears when the diagnostic runs and passes.

• A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission re-

lated diagnostic.

• Clear the DTC with a scan tool.

Step

Action

Value(s)

Yes

NOTE: Before clearing DTC(s) use the scan tool “Capture info”
to record Freeze Frame and Failure Records for reference, as data
will be lost when “Clear Info” function is used

Was the “On-Board Diagnostic (OBD) System Check” per-
formed?

Go to step 2.

Go to OBD Sys-

tem Check.

NOTE: P0602 indicates the ECM is not programmed.

Is DTC P0602 set?

Go to Step 3

Go to Step 5

Program the engine control module (ECM).

Does DTC P0602 reset?

Go to Step 4

Go to Step 6

Ensure that all tool connections are secure.

Ensure that the programming equipment is operating cor-
rectly.

Ensure that the correct software/calibration package is used.

Attempt to program the ECM.

Does DTC P0602 reset?

Go to Step 5

Go to Step 6

Replace the faulty ECM.

Did you complete the replacement?

Go to Step 6

Clear the DTCs with a scan tool.

Turn OFF the ignition for 30 seconds.

Start the engine.

Operate the vehicle within the Conditions for Running the
DTC. You may also operate the vehicle within the conditions
that you observed from the Freeze Frame/Failure Records.

Did the DTC fail this ignition?

Go to Step 2

Go to Step 7

Using the Scan Tool select “Capture Info,” Review Info.” Are
any DTC’s displayed that have not been diagnosed?

Go to the appli-

cable DTC

table.

System OK.

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