1999 Cadillac DeVille - Answered Questions & Fixed issues
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 DetailsIndicators: 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"
1/18/2019 6:30:06 AM •
1999 Cadillac...
•
Answered
on Jan 18, 2019
•
4,062 views
99 cadillac deville delegance...im lost with
What you may be hearing is hum from a low voltage power module under the dash, which is activated every time you open a door. It should shut off after doors are closed, all timed devices (such as cabin lights) turn off and the key is not in the ignition. If your battery is in good condition, then either this module, the keep-alive module or something else drawing current is not shutting off the way it is supposed to. Start by checking for trouble codes (DTCs) with a good code reader.
1999 Cadillac Deville..cold air is only coming out
The bad news is that it is most likely a faulty actuator and this will be difficult to replace as they have to partially dismantle the dash to get at it. Go to a couple of dealers and get them to give you a quote for the work. They may not be able to give you an exact quote as they wont know exactly what the problem is until it is dismantled, so ask for an estimate. Jobs like this usually wont be expensive for parts, but there is a lot of labour involved..
Need to locate the air pump that supplies the rear shocks.
The pump is back under the rear of car, but by now, the shocks are sure to be leaking, which causes the pump to run too much burning it up. Best fix is to replace rear shocks with coils and dump the self leveling feature, or prepare to pay big bucks to replace most components.
10/13/2017 11:18:55 PM •
1999 Cadillac...
•
Answered
on Oct 13, 2017
•
481 views
1999 CAD DEVILL COOLING FANS NOT WORKING WHERE ARE THE RELAYS LOCATED?
Engine Cooling Fan Relay 1
In the center front of the engine compartment, on the lower radiator support, near the cooling fans
Engine Cooling Fan Relay 2
In the center front of the engine compartment, on the lower radiator support, near the cooling fans
Engine Cooling Fan Relay 3
In the center front of the engine compartment, on the lower radiator support, near the cooling fans
What sealer is head gasket sealer
Computer glitch , have it checked for DTC'S - diagnostic trouble codes . Not all codes turn on the check engine light . Plus DTC'S for the BCM - body control module won't turn the check engine light on at all , could turn on a yellow wrench symbol on the insturment cluster .
Stop putting head gasket sealer into the cooling system , could clog it up.
MY 1999 DEVILLE OVERHEATS AFTER
You may have an air lock in the system. This is a pain with these engines, and Cadillac has a specific procedure for removing them (see Alldatadiy.com). Otherwise, your water pump may be shot, or there is a blockage somewhere in the cooling system (are you absolutely sure the thermostat is working - installed the right way?).
Also, are both the radiator fans running when it starts to overheat? If not, may have a blown fuse, or the relay for the fans may be shot.
All car manufacturers strongly recommend using an all-type antifreeze because it also contains corrosion inhibitors - tap water alone is not a good idea.
Most good battery chargers will trickle charge a charged battery - this is normal. Even with the car shut off, there will be a small drain on the battery to keep the electronics alive. HOWEVER, for this same reason, it is never a good idea to use a battery charger while the battery is in the car, or to jump start a dead battery in the car - the electronics do not like this.
99 cadillac, shift interlock
Logically, if there is power at the solenoid all the time there is a problem with the brake switch assembly or wiring. If not, the solenoid may simply be stuck in the activated position.
Not finding what you are looking for?