P1258 Possible Causes
- Faulty engine coolant temperature
- Engine coolant temperature harness is open or shorted
- Poor electrical connection in the engine coolant temperature circuit
How is P1258 Code Repair Done?
Start by checking the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
Possible Symptoms
- Engine light on (or service engine soon warning light)
P1258 Meaning
To reduce engine temperature, the Powertrain Control Module (PCM) has the ability to disable a number of fuel injectors during engine overheating. The PCM considers engine overheating whenever the Engine Coolant Temperature (ECT) reaches a predetermined temperature. This DTC is set to indicate that the PCM has detected an overheating condition and the system has engaged protection mode.