Question about 2003 Volkswagen Jetta TDI

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My 2003 jetta's mil light was on. It said P0118; so i replaced the sensor. Now the temperature gauge flashes when I turn on the car and the mil light is still on.

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Hi,
First check conector going to temprature sensor and if is good replace thermostat.

Posted on Mar 08, 2009

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P0118 code


Make sure you didn't accidentally unplug the ECT sensor or damage the wires. If visual inspection checks out ok clear the code and verify it comes back. If it does probably need a new sensor and or thermostat, pay attention to your temperature gauge. If it acts erratic or definitively different then normal, most likely need a thermostat. I usually just replace both and be done with it.

Mar 18, 2014 | 2002 Nissan Altima

1 Answer

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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I have a problem with the code P0118 of my 2002 Jetta GL can you help me?


Make sure coolant level is as it should be. If level is low look for evidence of leak(s). Top off fluid if necessary. The engine coolant temperature sensor is a very common issue with these vehicles and may be the cause of your issues if no leaks are found. Also a faulty thermostat cans cause the sensors to read voltage high but most likely a sensor issue. The sensor is a potentiometer (variable resistor). The computer sends 5v through one of the wires this voltage goes through a resistor which will vary the voltage based on temperature sensed by the engine coolant temperature sensor. The sensor has a negative temparature coefficient meaning the resistance will go down when temperature is high and up when temperature is low. The less resistance the more of the 5 v gets back to the computer. The PCM detects this high voltage and set the check engine light on warning you of an issue. Whe this sensor goes bad it is usually accompanied by temperature gauge fluctuation or erratic operation and the cooling fans run long or all the time even though the vehicle is cold. Hope this helps.

Feb 14, 2013 | Cars & Trucks

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Engine runs rough if it warms up won't start dtc codes p0118 and p0113 just did head gasket and replaced exhaust manifold all new gaskets new plugs wires and coolant engine timing marks are all c


P0113 Intake Air Temperature Circuit High Input


Low temperature results in a high signal voltage. When the PCM sees a signal voltage higher than 5 volts, it sets this P0113 check engine light code.

P0118 - The 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.
Potential Symptoms

Symptoms of a P0118 could include:

  • Very poor fuel economyicon1.png
  • A no start condition
  • Vehicle may start, but run very poorly, blowing black smoke, running very rough and misfiring
  • Illumination of MIL
Causes

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)

Jan 04, 2013 | 2003 Dodge Stratus

1 Answer

Check engine light is on and code is PO118 what is it


Symptoms of a P0118 could include:
  • Very poor fuel economy
  • A no start condition
  • Vehicle may start, but run very poorly, blowing black smoke, running very rough and misfiring
  • Illumination of MIL
Causes 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)

Jun 16, 2011 | 2001 Hyundai Accent

1 Answer

1998 Honda accord code PO118


P0118 - Engine Coolant Temperature Circuit High Input

What does that mean?
The 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.

Symptoms of a P0118 could include:
* Very poor fuel economy
* A no start condition
* Vehicle may start, but run very poorly, blowing black smoke, running very rough and misfiring
* Illumination of MIL

Causes
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)

Possible Solutions
First, if you have access to a scan tool, check the reading of the coolant sensor. Does it read a logical number? If so, the problem is likely intermittent. Perform a "wiggle" test by wiggling the connector and harness to the sensor while watching the reading on the scan tool. Watch for any drop-outs. Drop-outs would indicate a bad connection. If the scan tool reads an illogical temperature, check the resistance of the temperature sensor. If it is out of specs, replace it. If it is in specifications, unplug the sensor and, using a fused jumper wire, jumper the two terminals of the connector together. The temperature reading should now be maxed out to above 250 degrees F. If not, there is likely a problem with the ground circuit or voltage supply.

Check for 5 volts reference voltage at the connector. Also check for ground presence at the connector. If you do not have 5V ref. and/or ground continuity, check for these back at the PCM connector. If you have these at the PCM connector, then repair open or short between the PCM and the sensor. If you do not, remove the offending wire from the PCM and then check for proper voltage at the PCM pin. If it's present now, repair short on the circuit. If it isn't present after removing the wire and checking the pin, replace PCM

NOTE: 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.

Other engine coolant engine light codes: P0115, P0116, P0117, P0118, P0119, P0125, P0128

Hope helps.

Jun 06, 2010 | 1998 Honda Accord

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

1 Answer

Code P0118 on Audi A4 - Related to Ignition Coil Problem?


Hi, the sensor on the engine (right at the rear end of the cylinder head) has two separate outputs. One drives the temperature gauge and the other provides data for the engine control unit. The output for the engine control unit is almost certainly faulty and the sensor will need to be replaced. It isn't an expensive item and's not time consuming to replace (1/2 hr) - so you could ask Audi to do it for you when they replace the ignition coils.
Hope that helps Matt..

Nov 15, 2009 | 2005 Audi A4

1 Answer

Temperture icon flashes


if the light is blue it just means the car is not at operating temperature yet. let the car warm up before driving. if the light is red and only stays on for seconds check the coolant level. could possibly be a bad level sensor also if the light is red

Oct 18, 2008 | 2003 Volkswagen Beetle TDI

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