Sierra, Silverado 2006-2007

6.6L V8 VIN 2 Auto 3

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Trouble Code: P0561



System Voltage Unstable

Possible Causes:



Inspect for aftermarket devices that could affect the operation of the starting and charging systems.
 
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.Inspect for the presence of aftermarket accessories, such as a remote starter, etc. Depending on how these aftermarket accessories are installed, they may interfere with the required voltage for proper operation of the transmission.
 

Trouble Code: P0562



System Voltage Low

Possible Causes:



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.Inspect the batteries for proper voltage.Inspect the charging system for proper operation.You may have to drive the vehicle in order to experience a condition.Inspect for the presence of aftermarket accessories, such as remote starters, etc. Depending on how these aftermarket accessories are installed, they may interfere with the required voltage for proper operation of the transmission.
 

Trouble Code: P0563



System Voltage High

Possible Causes:



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.Inspect for the presence of aftermarket accessories, such as a remote starter, etc. Depending on how these aftermarket accessories are installed, they may interfere with the required voltage for proper operation of the transmission.
 

Trouble Code: P0567



Cruise Control Resume Switch Circuit

Possible Causes:



Ensure that the Resume/Accel switch is not stuck or sticking in the engaged position.
 
For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P0568



Cruise Control Set Switch Circuit

Possible Causes:



Inspect for a set/coast switch stuck in the engaged position or the signal circuit is shorted to voltage.
 
For an intermittent, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P0571



Cruise Control Brake Switch Circuit

Possible Causes:



Refer to Exterior Lighting Systems Description and Operation , in order to avoid a misdiagnosis.
 
For an intermittent, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P0601



Control Module Random Access Memory (RAM) Failure (6L50/6L80/6L90)

Trouble Code: P0602



Control Module Not Programmed

Trouble Code: P0603



Control Module Random Access Memory (RAM) Failure (6L50/6L80/6L90)

Trouble Code: P0604



Control Module Random Access Memory (RAM) Failure

Trouble Code: P0605



Control Module Programming Read Only Memory

Trouble Code: P0606



Control Module Internal Performance

Trouble Code: P0607



Control Module Performance

Trouble Code: P0608



Vehicle Speed Output Circuit

Possible Causes:



Important: Remove any debris from the PCM connector surfaces before servicing the PCM. Inspect the PCM connector gaskets when diagnosing/replacing the PCM. Ensure that the gaskets are installed correctly. The gaskets prevent water intrusion into the PCM. Using Freeze Frame and/or Failure Records data may aid in locating an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data can aid in determining how many miles since the DTC set. The Fail Counter and Pass Counter can also aid determining how many ignition cycles the diagnostic reported a pass and/or a fail. Operate the vehicle within the same freeze frame conditions (RPM, load, vehicle speed, temperature etc.) that you observed. This will isolate when the DTC failed. For an intermittent, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P060B



Control Module Analog to Digital Performance

Trouble Code: P0613



Transmission Control Module (TCM) Processor

Trouble Code: P061C



Control Module Engine Speed Performance

Trouble Code: P062C



Control Module Vehicle Speed Performance

Trouble Code: P062F



Control Module Long Term Memory Performance

Trouble Code: P0634



Transmission Control Module (TCM) Internal Temperature Too High

Possible Causes:



Clean the TCM if necessary. Excessive road debris will reduce the effectiveness of the heat sink on the TCM and could cause the internal temperature to rise.
 

Trouble Code: P0642



5-Volt Reference 1 Circuit Low Voltage

Trouble Code: P0643



5-Volt Reference 1 Circuit High Voltage

Trouble Code: P0646



Air Conditioning (A/C) Clutch Relay Control Circuit Low Voltage

Trouble Code: P0647



Air Conditioning (A/C) Clutch Relay Control Circuit High Voltage

Trouble Code: P064C



Glow Plug Module Control Performance

Trouble Code: P0650



Malfunction Indicator Lamp (MIL) Control Circuit

Possible Causes:



An intermittent or poor connection at the MIL control circuit in the inline harness connector may cause this DTC to set. Inspect the connector terminals for any condition that may result in excessive resistance. Refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P0652



5 Volt Reference 2 Circuit Low Voltage

Trouble Code: P0653



5 Volt Reference 2 Circuit High Voltage

Trouble Code: P0654



Engine Speed Output Circuit

Possible Causes:



Important: Remove any debris from the PCM connector surfaces before servicing the PCM. Inspect the PCM connector gaskets when diagnosing/replacing the PCM. Ensure that the gaskets are installed correctly. The gaskets prevent water intrusion into the PCM. Using Freeze Frame and/or Failure Records data may aid in locating an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data can aid in determining how many miles since the DTC set. The Fail Counter and Pass Counter can also aid determining how many ignition cycles the diagnostic reported a pass and/or a fail. Operate the vehicle within the same freeze frame conditions (RPM, load, vehicle speed, temperature, etc.) that you observed. This will isolate when the DTC failed. For an intermittent, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P0658



Actuator Supply Voltage 1 Low

Possible Causes:

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.
 

Trouble Code: P0659



Actuator Supply Voltage 1 High

Possible Causes:

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.
 

Trouble Code: P0671



Cylinder #1 Glow Plug Control Circuit

Possible Causes:



If the battery is connected with the ignition ON, the glow plugs could be damaged without finding any circuit fault.
 

Trouble Code: P0672



Cylinder #2 Glow Plug Control Circuit

Possible Causes:



If the battery is connected with the ignition ON, the glow plugs could be damaged without finding any circuit fault.
 

Trouble Code: P0673



Cylinder #3 Glow Plug Control Circuit

Possible Causes:



If the battery is connected with the ignition ON, the glow plugs could be damaged without finding any circuit fault.
 

Trouble Code: P0674



Cylinder #4 Glow Plug Control Circuit

Possible Causes:



If the battery is connected with the ignition ON, the glow plugs could be damaged without finding any circuit fault.
 

Trouble Code: P0675



Cylinder #5 Glow Plug Control Circuit

Possible Causes:



If the battery is connected with the ignition ON, the glow plugs could be damaged without finding any circuit fault.
 

Trouble Code: P0676



Cylinder #6 Glow Plug Control Circuit

Possible Causes:



If the battery is connected with the ignition ON, the glow plugs could be damaged without finding any circuit fault.
 

Trouble Code: P0677



Cylinder #7 Glow Plug Control Circuit

Possible Causes:



If the battery is connected with the ignition ON, the glow plugs could be damaged without finding any circuit fault.
 

Trouble Code: P0678



Cylinder #8 Glow Plug Control Circuit

Possible Causes:



If the battery is connected with the ignition ON, the glow plugs could be damaged without finding any circuit fault.
 

Trouble Code: P0698



5-Volt Reference 3 Circuit Low Voltage

 
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