For Shop Owners

P1258 CADILLAC - Engine Coolant Overtemperature Protection Mode Active

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3 What does this mean?

Possible causes

  • Faulty Engine Coolant Temperature
  • Engine Coolant Temperature harness is open or shorted
  • Engine Coolant Temperature circuit poor electrical connection
What does this mean?

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P1258 CADILLAC Description

In order to reduce the engine temperature the Powertrain Control Module (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 Engine Coolant Temperature (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.
OBDII Code P1258 Cadillac - Engine Coolant Overtemperature Protection Mode Active -

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P1258 CADILLAC Comments

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Any information is appreciated. Thanks
Repair Importance Level: 3
1=Low 2=Medium 3=High
Repair Difficulty Level: 3
1=Easy 2=Moderate 3=Hard

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Posted and Edit by 07-25-2016

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