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How to fix code p1258 on cadillac

Engine overheating after coolant has been topped off and oil has been changed. Has been checked and there are no leaks. There is alot of water and moisture leaking out of the mufflers.

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Posted on Jan 02, 2017

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SOURCE: car leaking coolant

First of all ensure that your car is leaking coolant fluid, and what is dripping is not just water condensation from the air conditioner.
If you have a coolant liquid leak, it can be from one of the ducts leading to radiator , from water pump or radiator itself. Check liquid levels, and if you have a leak have the car inspected by a qualified mechanic.
A broken water pump, for example, can cause your motor to blow in few miles.

Posted on Jun 08, 2008

  • 45 Answers

SOURCE: coolant leak

You should be able to, so yes. If you have a coolant leak the pressure will build and slowly decrease or it will not get to the correct pressure. Unless the leak is in the radiator cap itself as the pressure tester generally uses a different cap.

Posted on Nov 11, 2008

  • 2 Answers

SOURCE: 1999 Cadillac coolant leak,can not find is my experience with our 1999 Deville. We had the same problem with ours almost 8 months until we had the coolant flushed and filled. That is when our problem reared its ugly head. As you probably already know, this Northstar engine does have well known issues with head gasket failure as well as head bolt issues and last but not least, thermostat problems. If you haven't had an "official" overheat ( not just the coolant low light, but a true blue overheat where car has safety to shut down or run on half the cylinders) you should be fine and your engine healthy enough to repair.

I would dare say it is your head gasket. The first thing you should do is pressure test your sytem, this will diagnose whether or not it is infact your head gasket. It could also be a head bolt(s) that pull from the block when car gets too hot. If either of these things are the problem, be prepared for the investment and be sure that whoever does the work on your engine knows how to diagnose whether your engine is good enough to repair. Cadillac service bulletins instruct dealerships to replace the engine in this case, but you can repair an engine that is healthy enough. It is costly and you must love your car, but if the love is TRUE, you will love it more when it is repaired.

You did mention that the oil is fine...I know you wereprobably looking for coolant.....when these head gaskets go, the coolant doesnt necessarily mix with the oil, in fact, we didnt have that problem at all. Our coolant was shooting out the tailpipe and evaporating. You could probably check your spark plugs for coolant residue, but you would have to be sure to check them all, because you will probably have the problem in only 1 cylinder. The best way to get a yes or no is the pressure test. Good Luck!

Posted on Apr 07, 2009

  • 2692 Answers

SOURCE: 99 Cadillac Deville Coolant Leak

Most likely a cracked block or free plug that came out or loose. Other options are hozes, which I believe the dealer would have fixed. A third option is the water pump itself. 

Posted on May 06, 2009

  • 22326 Answers

SOURCE: 1996 Cadillac Deville overheating- head tested, no

remove pump and check that the imèller which is plastic hasnt seperated from drive shaft

Posted on Jul 16, 2009

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3 Answers

2006 Pontiac g6 code p1258 . The temperature gauge was fluctuating while driving from overheating to normal operation temp but no actual sign of overheating . So I replaced the coolant temp sensor ran it...

I suggest changing the cooling thermostat to make sure it's not getting stuck causing temporary overheating and flush the system and put fresh coolant in.
The guage will go hotter then go back to normal every time the thermostat opens to let cooled water into the engine block which is normal. Time for concern is when the guage goes hot and stays there along with bubbling sounds and coolant overflow onto the ground. Which you probably already know.

Mar 02, 2018 | Pontiac Cars & Trucks

1 Answer

I have 2000 cadillac deville and its overheating

P0741 - Torque converter clutch slip speed is exceeding limit; P1258 - High engine metal temperature. Sounds like you have transmission problems - torque converter problems can cause engine overloading, which in turn can cause the overheating. I would start with a complete transmission check before the engine is seriously damage the engine.

Sep 27, 2014 | 2000 Cadillac DeVille

1 Answer

P1258 code

could be a thermostat, head gasket , not fill properly,
P1258 is: engine overtemperature protection, or low coolant fuel disable

Sep 19, 2013 | 1996 Cadillac Eldorado

1 Answer

What is a code p1258 on chevy equinox

DTC P1258 - Engine Coolant Over-Temperature Protection

The powertrain control module (PCM) has the ability to disable 4 injectors during an engine over-temperature (overheating) conditoin. Engine is considered over-temperature whenever the engine coolant temperature reaches 268 F. This protection mode allows the PCM to alternate between groups of cylinders, thereby reducing coolant temperature. This is accomplished by disabling the fuel injectors. This DTC is set to show that an overheating condition was or is observed by the PCM and that the protection mode has been engaged.

You will need to inspect the cooling system to see what is causing your overheating issue. If the engine is not actually overheating, this code may be set due to a faulty engine coolant temperature (ECT) sensor.

Hope this helps, also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Apr 10, 2012 | Chevrolet Equinox Cars & Trucks

2 Answers

2003 chev silverado truck 5.3 the code im getting is p1258 that means engine over heated and the truck did that so can any one help me

You need to figure out why it overheated. Check the coolant level in the radiator/overflow tank. Thermostat may have stuck closed, the water pump may have failed. If the coolant level is low then add coolant and check it often. If the coolant is up to the right level then I would probably change the water pump and thermostat.

Since the engine has to get pretty hot to set this code, You may have comprimised the head gaskets. Look at the dipstick for any signs of water ( milky oil) and take the cap off where you add oil and look/feel for moisture. If you do see any signs of coolant then you will need to remove the heads. I am not that familiar with the engine, but Chevy uses plastic gaskets for the intake on some engines and they have been known to fail.

Jul 26, 2011 | 2005 Chevrolet Equinox

1 Answer

I have a 1996 cadillac deville with codes PO741 and P1258 current. Tonight it shut down as I was driving, what could be the problem?

P0741....Torque Converter Clutch Circuit Performance or Stuck Off
P1258 Engine Coolant Overtemperature - Protection Mode Active
the first code is a generic code the latter code is a GM code and if this is correct the engine shut down because it was overheating for whatever reason or the sensor is faulty

May 02, 2011 | Cadillac DeVille Cars & Trucks

3 Answers

The other day my check engine light came on after my engine started overheating. I did a diagnostic reading on it and the code came up P1258. What does that entail?

code po 1258 is an overheating code, need to check why u r overheating, start simple, do u have fluid, has it been changed , might need thermostat, how old is truck,. is there a leak pressure check on radiator and see if it leaks, check radiator temperature vs engine temperature. get a thermo scanner they work good. point and it reads how hot . if motor is hotter replace thermostat. check make sure oil level is good. get back to me let me know what u find..

Mar 28, 2011 | Chevrolet Silverado 1500 Cars & Trucks

1 Answer

P1258 CODE

Trouble Code: P1258 (4.6L V8 VIN 9 Auto)
Engine Metal Over-Temperature Protection
Number of Trips to Set Code: 1
OBD II Monitor Type: CCM Details
Indicators: MIL Details
Trouble Code Conditions:
DTC P0117, P0118 and P0125 not set, Engine started; and the PCM detected the ECT sensor indicated more than 270ºF for 10 seconds. The PCM uses the ECT sensor to detect if the engine is running too hot (when the ECT sensor is over 268ºF). If the engine is overheated, DTC P1258 will set. The PCM will disable 2 groups of four cylinders by turning off the fuel injectors. By switching between the two groups of cylinders, the PCM is able to reduce the temperature of the coolant and lower the temperature.

Possible Causes:
  • Engine cooling system problem (test the cooling fan operation)
  • Engine coolant level is low or the mixture is not correct
  • ECT sensor is out-of-calibration or "skewed"

Aug 13, 2010 | 1999 Cadillac DeVille

2 Answers

Code p1258 engine light an oil light came on, 2005 equinox

2003 chev silverado truck 5.3 code p1258 the truck over heated and shut down can someone help me please

Feb 06, 2010 | 2005 Chevrolet Equinox

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