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P0117, P0118 and the Temp gauge doing the WAVE

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Old 10 Nov 2017, 05:54 pm
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Join Date: Sep 2017
Posts: 6
Default P0117, P0118 and the Temp gauge doing the WAVE

2002 PT cruiser NON TURBO

P0117 ECT low input signal
P0118 ECT High input signal

Gauge is either ALL THE WAY at the bottom or ALL THE WAY at the top. Coolant light is also on.

Checked coolant....FULL
Changed ECT difference.

Hooked up my code reader bluetooth thingy and the engine temp that it shows is either -40 or 260.6 F

Has anybody else experienced this? If so, what is the solution? I do not want to take it in to a repair shop, I just hate chasing down electrical issues...

Thanks to everyone in advance....
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Old 10 Nov 2017, 06:11 pm
Obsessed Cruiser
Join Date: Aug 2014
Location: Thousand Oaks, CA
Posts: 7,500
Default Re: P0117, P0118 and the Temp gauge doing the WAVE


These include P0115, P0116, P0117, P0118 & P0119, and can be set if the coolant sensor readings do not change as the engine warms up, if the readings are too high or too low (out of range), if there is no signal from the sensor, or if the engine overheats.

The coolant sensor monitors engine temperature. This is a key function because it allows the fuel management system to go into the closed loop mode of operation when the engine warms up. The computer also uses engine temperature to control other functions, too. A failure here can prevent the system from going into closed loop causing a rich fuel mixture, and an increase in fuel consumption and emissions.

A coolant sensor's resistance changes as the temperature increases. If you don't see a change in the resistance as the engine warms up, or the resistance is out of specifications, the sensor is bad.

Other things that can cause bad sensor readings include a low coolant level in the cooling system, a thermostat that is stuck open or shut, or a thermostat that has the wrong temperature rating for the engine.

First thing I would suggest checking the wiring and the wiring connector going to the engine coolant temperature sensor.
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