DTC P0667, P0668, or P0669
Diagnostic Instructions
DTC Descriptors
DTC P0667: Control Module Temperature Sensor
Performance
DTC P0668: Control Module Temperature Sensor
Circuit Low Voltage
DTC P0669: Control Module Temperature Sensor
Circuit High Voltage
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
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Short to Voltage
|
Signal Performance
|
TCM Temperature Sensor
|
P0668
|
P0669
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-
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P0667
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Circuit/System Description
The transmission control module (TCM) temperature sensor is
located inside of the control solenoid valve assembly which has no
serviceable components. The TCM temperature sensor provides the
temperature of the TCM. This temperature reading is used in various
shifting and diagnostic routines in the TCM software. This fault is
handled inside the TCM and no external circuits are involved.
Conditions for Running the DTC
P0667
• |
DTC P0101, P0102, P0103, P0106, P0107, P0108,
P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205,
P0206, P0207, P0208, P0300, P0301, P0302, P0303, P0304, P0305,
P0306, P0307, P0308, P0401, P042E, P0658, P0667, P0668, P0669,
P06AD, P06AE, P0712, P0713, P0716, P0717, P0722, P0723, P0962,
P0963, P0966, P0967, P0970, P0971, P215C, P2720, P2721, P2729, or
P2730 is not set. |
• |
The engine torque signal is valid. |
• |
The ignition voltage is 9.0 volts or
greater. |
• |
The engine speed is greater than 400 RPM for
5 seconds or greater. |
• |
The throttle position signal is valid. |
P0668
• |
The ignition voltage is 9.0 volts or
greater. |
• |
The engine speed is greater than 400 RPM for
5 seconds or greater. |
P0669
• |
DTC P0669, P0716, P0717, P0722, or P0723 is
not set. |
• |
The ignition voltage is 9.0 volts or
greater. |
• |
The engine speed is greater than 400 RPM for
5 seconds or greater. |
Conditions for Setting the DTC
P0667
• |
The difference between the transmission fluid
temperature (TFT) and TCM substrate temperature is greater
than 20-50°C (36-90°F), depending on the average of
the TFT, TCM substrate, and TCM power up temperatures. |
• |
The difference between the TCM power up
temperature and TCM substrate temperature is greater than
8-10°C (14-18°F) depending on the average of the TFT, TCM
substrate, and TCM power up temperatures. |
• |
The above conditions have to be met for
5 minutes within a 6 minute period. |
P0668
The TCM internal temperature is 254°C (489°F) or greater
for 1 minute.
P0669
The TCM internal temperature is -254°C (-425°F) or less
for 1 minute.
Action Taken When the DTC Sets
• |
DTCs P0667, P0668, and P0669 are
Type B DTCs. |
• |
The TCM defaults to using the TCM power up
temperature sensor value in place of the TCM temperature
value. |
Conditions for Clearing the DTC
DTCs P0667, P0668, and P0669 are Type B DTCs.
Diagnostic Aids
The TCM temperature sensor is located inside of the control
solenoid valve assembly and its output should resemble that of the
TFT sensor output.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics
Connector End View Reference
Description and Operation
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition ON, engine OFF. Verify the scan tool TCM
Temperature parameter is between -254 and +254°C (-425 and
+489°F).
- Operate the vehicle at 64 km/h (40 mph) for
10 minutes. Monitor the TCM Temperature parameter and the
Transmission Fluid Temperature parameter with a scan tool. The TCM
Temperature parameter should increase by more than 2°C
(3.5°F). Also, the TCM Temperature parameter and the
Transmission Fluid Temperature parameter should be within 20°C
(36°F) of each other.
⇒ |
If the TCM Temperature parameter does not increase
by greater than 2°C (3.5°F) or the TCM Temperature
parameter value is not within 20°C (36°F) of the
Transmission Fluid Temperature parameter, then replace the Q8
control solenoid valve assembly. |
- After performing the above steps, verify that the DTC
does not reset by operating 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
data. If the vehicle passes the Circuit/System Verification
procedure, refer to
Testing for Intermittent Conditions and Poor Connections .
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
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