Chevrolet P1258: Engine Overtemp Protection Mode — Fix
On Chevrolet vehicles, P1258 means the engine has entered coolant-overtemperature protection mode — GM cuts fuel to some cylinders to protect the engine from overheating.
- Applies to
- Chevrolet vehicles
- Est. repair cost
- $50 – $1,500
- Time to fix
- 30 minutes – 2 hours
What it means
Causes include low coolant, a failed thermostat/water pump, a stuck fan, a blocked radiator, or a head gasket fault. P1xxx codes are manufacturer-specific — P1258 is defined by Chevrolet (not part of the generic SAE J2012 set), so this definition applies to Chevrolet vehicles. Model years can vary, so confirm against the Chevrolet service manual. Fix the fault, then clear the code with a scan tool.
Symptoms
- Check engine light + high temperature
- Power loss / cylinders cutting out
- Coolant loss or steam
How to fix it
- 1
Stop and let it cool, check coolant
1. Do not keep driving an overheating engine. 2. Once cool, check coolant level and look for leaks.
- 2
Fix the cooling system
1. Test the thermostat, water pump, fan, and radiator. 2. Repair before driving, then clear the code.
Frequently asked questions
Is P1258 safe to drive with?
No — it means the engine overheated and is protecting itself. Fix the cooling fault before driving to avoid engine damage.
Last updated July 19, 2026
Guidance only — always consult a qualified professional or the official service manual before carrying out repairs.