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P0118 problems on merc 2001 230k sports coups change temperature sensor worked for 3 days then problem return .

When you start the car fan comes on in seconds have changed the engine coolant temperature sensor which solved the problem for 3 days then the same problem returned.

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Pauline, a code P0118 may mean that one or more of the following has occurred: 1) A bad connection at the sensor 2) An open in the ground circuit between the temp. sensor and the powertrain control module (PCM) 3) An open or short in the voltage feed between the sensor and the PCM 4) A bad PCM (unlikely) 5) A bad temperature sensor. I would first check that you have a good connection at the sensor. If you have a digital voltmeter, you can also check to see if you are getting the proper signal to the sensor (with the ignition ON). One connector terminal should read 5 volts, and the other should be grounded. If you have neither one or the other, then you need to check the wiring back to the PCM. Check for broken or shorted wires. Also check for the 5 volts and ground at the coolant sensor PCM connection. If the correct reading are not present at the PCM, then the PCM needs to be repaired or replaced. An expensive proposition, I'm afraid.

Posted on Feb 13, 2014

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Posted on Jan 02, 2017

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dustyboner
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SOURCE: my obd2 is showing me a code p0118 engine coolant temperature circut high input

d220d27.jpg this is the coolant temp sensor, it sends a signal to the engine ECU
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d9e2deb.jpg
this is the temp sending unit. it sends a signal to the gauge on the instrument panel.
this is what you need to get to fix your temp gauge.

Posted on Oct 15, 2008

  • 1596 Answers

SOURCE: 95 grand am radiator fan only runs with AC on

Cooling Fan Temp Sensor is the First thing You Check (with what you have described) Cooling Fan Should ALways come On When The A/C is turned On as A/C Adds A Load to Engine, If Temp Sensor is Faulty it Will Not Give GROUND Signal to ECM >For COOLING FAN >RELAY to Give ground and turn ON The Fan.
There ARE 2 temp Sensors that Serve Different Purposes 1 is for Dash READING GAGE & Or TEMP LIGHT the Other is For ECM or Fan Relay (SAME Thing) you Said>""can disconnect the sensor and fan continues to run" < This Leads me to think you Changed the Wrong One. Not Questioning your Skills Just Here to Help.
TEMP SENSOR FOR 3.1L V6 is Located upper RH rear of engine compartment, near exhaust system. Temp SENSOR for 2.3L Engine is Located in LH rear of engine compartment.
I Hope this Helps Lead you to a NON-OVERHEATING Pontiac.
Good Luck and Have A Great Evening. rejakwilson

Posted on Feb 04, 2009

  • 6982 Answers

SOURCE: 1996 Mercury Sable Wagon Overheating

sometimes the radiator is just too plugged to respond to flushing. (happens a lot with a marginal radiator because when flushing, the solvent simply goes around the plugged area, and cannot build up enough force to break it free). From what you have written, this may be the case. Is the electric fan coming on and off at the right times? if not this also can give you similar problems. You have done the right things but may not have gotten the desired result. Hope this info helps you a bit.
good luck

Posted on Apr 03, 2009

  • 103 Answers

SOURCE: Overheating problem

With the sensor unplugged and the fan works,, replace the new sensor,,,,, it is probably defective. I have seeh this before.

Posted on Jul 28, 2009

johnjnail
  • 1702 Answers

SOURCE: Code P0133-02 (o2 sensor slow

just because you have a slow response code does not mean that you have a bad sensor, the slow response code is just telling you that the fuel system is very slow to respond to fuel delivery changes, this could be caused by many different things it could be as simple as the oil is contaminated with fuel, it could also be a problem with the fuel pressure, could also be a vacuum leak. the fact that you keep getting the same code with different sensors tells me that the problem is not the sensor but the fuel injection system. there is a flow chart for the fuel system and i am afraid you are going to have to have someone run a diag. check on the fuel system.....SORRY

Posted on Jan 13, 2011

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P 0118, p 0340 and p 1193 probleme on my chrysler pt cruiser 2000


P0118 Engine Coolant Temperature Sensor Circuit High bad sensor
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Replace ect and can sensor erace codes and car should should be good.

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Trouble codes p0118 temperature po118


code p0118 refers to engine coolant temperature (ETC) sensor ---circuit malfunction===causes---coolant thermostat---wiring open circuit/short to positive---wiring short to ground---ground wire defective---ECT sensor.. The temp gauge works off a temperature sender unit separate to the coolant sensor and if it is reading 100 then it indicates an overheat situation in the engine . Probably why the engine light is coming on. As the thermostat is in the list of causes I would replace it as a precaution. The coolant sensor is what tells the CPU to turn on the electric fans to cool the radiator

Jan 13, 2014 | 2004 GMC Envoy

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1998 sunfire temperature gauges quits working as soon as cooling fan comes on and check engine came on P0118 code


You may have a problem with the engine temp sensor or the wiring.
The fan would come on if the computer lost the signal from the sensor rather than the sensor failing because of the fan.
Low coolant is another possible cause.

Aug 15, 2012 | Pontiac Sunfire Cars & Trucks

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Code 1 senser P0118 on a 2004 V.W beetle dicesel


P0118 for Volkswagen - (ECT) Engine Colant Temperature Circuit High

Symptoms:- Engine Light ON (or Service Engine Soon Warning Light)

Possible causes:
(Inspect the following... Repair/Replace if necessary)
- Low engine coolant level
- Engine Coolant Temperature (ECT) sensor harness is open or shorted
- Engine Coolant Temperature (ECT) sensor electrical circuit poor connection
- Faulty Engine Coolant Temperature (ECT) sensor
- Faulty engine coolant thermostat

P0118 VOLKSWAGEN Description: The Engine Coolant Temperature (ECT) sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the Engine Control Module (ECM). The modified signal returns to the (ECM) as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.
When is the code detected?:When an excessively high voltage from the sensor is sent to ECM.

I hope this helps! Let me know if you need further assistance.

Mar 08, 2012 | Mercedes-Benz C Cars & Trucks

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P0118


As with all engine codes there is no one solution fits all, here is the info on the code from the diagnostic material.
P0118 - Engine Coolant Temperature Circuit High Input
Possible causes - Low engine coolant level
- Engine Coolant Temperature (ECT) sensor harness is open or shorted
- Engine Coolant Temperature (ECT) sensor electrical circuit poor connection
- Faulty Engine Coolant Temperature (ECT) sensor
- Faulty engine coolant thermostat P0118 Description The Engine Coolant Temperature (ECT) sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the Engine Control Module (ECM). The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.

Feb 02, 2012 | 2005 Chevrolet Tahoe

2 Answers

97grand am code P0118 replaced ect sensor clear code P0118 returns reference voltage is 2.4 volts engine off key on scan tool shows -38F with engine hot replaced ecm same result


Engine coolant temperature (ECT) sensor is a thermistor screwed into a coolant passage in the cylinder head. Sensor resistance is high when coolant temperature is low and resistance drops when coolant temperature increases. The powertrain control module (PCM) provides a 5 volt reference and a ground to the sensor. The PCM monitors voltage drop to determine coolant temperature. If the ECT reads less than freezing temp. when engine has been running for more than a few minutes, the PCM determines a circuit fault and sets this code. Or if the PCM determines the sensor resistance is out of specs, this code is set.

The reference values given below are measured between ECM terminal 72 and ground...



zjlimited_9.jpg


When measuring input / output voltage be careful not to use ECM ground terminals. The ECM will enter fail safe mode once a malfunction is detected and the MI will light up.

Usually, P0118 is indicative of a bad temperature sensor, but doesn't rule out these other possibilities. If you're unsure of how to diagnose a PCM, do not attempt.

Keep us updated.

Nov 04, 2010 | 1997 Pontiac Grand Am

1 Answer

I have a 2002 3-litre v6 a4 cab engine management


engine coolant temperature (ECT) sensor

A code P0118 may mean that one or more of the following has happened:
  • A bad connection at the sensor
  • An open in the ground circuit between the ECT sensor and the PCM
  • A short in the voltage feed between the sensor and the PCM
  • A bad PCM (less likely)
  • A bad temperature sensor (shorted internally)
info taken from http://www.obd-codes.com/p0118

Apr 21, 2010 | 2003 Audi A4 Cabriolet

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The check engine light on a 2001 beetle read code PO118 engine coolant temperature circuit high input. what do i do?


16502/P0118/000280 From Ross-Tech Wiki Jump to: navigation, search Contents [hide] if (window.showTocToggle) { var tocShowText = "show"; var tocHideText = "hide"; showTocToggle(); } 16502/P0118/000280 - Engine Coolant Temperature Sensor (G62): Signal too High Possible Symptoms
  • Difficulties with starting a cold engine.
  • Starting the engine when engine is warmish or warm, idle rpm immediately is 1200 - 3000 rpm.
  • RPM at idle is irregular.
  • With all engine temperatures idle rpm will often vary between 900 - 1000 rpm.
  • With engine warm (90 °C) the engine temperature suddenly drops (70 °C) and slowly comes back to 90 °C.
  • Bad acceleration during warm-up.
  • Diesel Engines: Glow plug indicator may be on for a longer than normal time or at ambient temperatures where it shouldn't come on at all.
Possible Causes
  • The electrical signal coming from G62 is too low
  • Wiring and/or connections faulty (short circuit?)
  • Engine Coolant Temperature Sensor (G62) faulty
Possible Solutions
  • Check wiring and connections
  • Check / Replace Engine Coolant Temperature Sensor (G62)
Special Notes
  • In many cars between MY 1995-2002 the G2/G62 had a bad reputation for failing often. The original G2/G62 sensor is black and the improved replacements are green.

Jan 26, 2010 | 2000 Volkswagen Beetle

1 Answer

One day starts next it does not start


if there is no service light on. it might come on at a later time. but in my situation the thermostat need to be changed and the engine coolant temperature sensor circuit. the sensor was broken and it would shut off the van after it started or after the engine warmed up it would not let it start. the code was P0118. You can have you engine light checked at any autozone. hope it helps.

Mar 27, 2009 | 1999 GMC Savana

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