DTC P1258 Engine Coolant Overtemperature - Protection Mode Active
In order to reduce the
engine temperature the PCM has the ability to disable a number of fuel
injectors during an engine over temperature condition. The PCM considers the
engine over temperature whenever the ECT reaches a predetermined temperature.
This DTC sets in order to show that the PCM detected an over temperature
condition and that the system engaged the protection mode.
Conditions
for Running the DTC
- DTCs P0117, P0118, P0125 are not
set.
- The engine is running.
Conditions
for Setting the DTC
- The engine coolant temperature is
greater than 132°C (270°F).
- The above conditions present for
greater than 10.0 seconds.
Action
Taken When the DTC Sets
- The PCM illuminates the malfunction
indicator lamp (MIL) on the second consecutive ignition cycle that the
diagnostic runs and fails.
- The PCM records the operating
conditions at the time the diagnostic fails. The first time the diagnostic
fails, the PCM stores this information in the Failure Records. If the
diagnostic reports a failure on the second consecutive ignition cycle, the
PCM records the operating conditions at the time of the failure. The PCM
writes the conditions to the Freeze Frame and updates the Failure Records.
Conditions
for Clearing the MIL/DTC
- The PCM turns OFF the malfunction
indicator lamp (MIL) after 3 consecutive ignition cycles that the
diagnostic runs and does not fail.
- A last test failed, or current DTC,
clears when the diagnostic runs and does not fail.
- A history DTC clears after
40 consecutive warm-up cycles, if no failures are reported by this or
any other emission related diagnostic.
- Use a scan tool in order to clear
the MIL and the DTC.
Important
If an overheating condition
exists, repair the overheat condition and change the engine oil and filter.
Using the 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 help determine how many miles since the DTC
set. The Fail Counter and Pass Counter can also help determine 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 condition, refer to Symptoms
.
The numbers below refer
to the step numbers on the diagnostic table.
|
Step |
Action |
Value(s) |
Yes |
No |
|
Did
you perform the Powertrain On-Board Diagnostic
(OBD) System Check? |
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Go to Engine
Overheating in Engine Cooling |