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Dodge caravan 2002 heating problem

Temperature runs normal, but heater does not blow warm. Also has check engine light with o2 sensor code. Will the o2 sensor cause the heat not to blow hot?

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The O2 sensor problem has nothing to do with the heat problem. Check your antifreeze level to make sure it is up where it should be. then check the thermostat which is most likely the problem. If either one of them are not the problem, it might be your water pump is getting weak.

Posted on Feb 02, 2009


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I have a dodge grand caravan wit the code p0135. internal controlmodule memorie check sum error no clue as to what it means please help

Code 135 should be a problem with the heater circuit for O2 sensor bank one sensor one. The O2 sensors have a heater to make them work as soon as the engine is started. The problem could be the sensor or the heater circuit.

Feb 18, 2014 | 2002 Dodge Grand Caravan

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Engine temperature gauge low

I would suspect the thermostat first.

Aug 17, 2017 | 2002 Dodge Grand Caravan

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P0037 code subaru outback I have replaced the cat and both o2 sensors and the same code comes up

I'm sorry you spent that money if this was the original code.

The code means one of the O2 sensors has a faulty heater or the power circuit for the heater is bad. The sensor is not heating up as fast as it should. Since you have replaced the sensor you would need to check the power circuit for the heater.

P0037 SUBARU Description Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. The faster the heated oxygen sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module (ECM).

In order to achieve the require temperature, a heater element is included inside the heated oxygen sensor. The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground.

The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.
Read more:

Sep 14, 2012 | 2000 Subaru Outback

1 Answer

Check engine light is on and it shows code P0032 on 2004 Dodge Grand Caravan 3.8 I think that is something on the O@ sensor, Can anyone point out where and how and if I have more than one O2...

P0032 - Oxygen (A/F) Sensor Heater Control Circuit High (Bank 1 Sensor 1)
A P0032 DTC (diagnostic trouble code) refers to the O2 sensor (oxygen sensor) located on Bank 1 in front of the catalytic converter. There is also an oxygen sensor behind the converter which is Sensor #2.

This O2 sensor #1 may also be refered to as an air/fuel ratio sensor since on some vehicles it is. The sensor detects the amount of oxygen in the exhaust gas compared to the outside air and then vehicle's computer adjusts the air/fuel ratio going into the engine. The sensor is less effective when the exhaust gas temperature is low, so it includes a heater which is activated to help get better readings from the O2 sensor. Essentially this P0032 code means that the resistance of the heater circuit is higher than normal. In some cases, that resistance level must be higher than 10 A to trigger the DTC code.

Note, this code is very similar in nature to P0031, P0051, and P0052

Most likely you'll not notice any symptoms other than the MIL (malfunction indicator lamp, a.k.a. the check engine light) will illuminate.

A P0032 DTC trouble code may be caused by one or more of the following:
A short in the heater circuit in the sensor
A failed O2 sensor heater
Wiring/connectors broken/frayed leading to sensor and/or relay
Failed PCM/ECM

I hope this helps, abd just keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment. Have a nice weekend and thanks for using FixYa.


Oct 16, 2011 | 2004 Dodge Grand Caravan

3 Answers

2002 dodge caravan engine light on code showing p0135 .please advice.thanks.

  • O2 Sensor Heater Circuit Malfunction - Bank 1 - Sensor 1
  • Basically the ECM Electronic Control Unit has determined your O2 sensor is taking to long to begin reacting properly.
  • The causes could be
  1. O2 heater element resistance could be to high.
  2. An internal short or opening in the heater element.
  3. O2 heater circuit wiring with high resistance.
  4. Open or short to ground in the wiring harness.

  • The fixes are
  1. Check the harness and connector to the O2 sensor for shorts or ground.
  2. Replace that O2 sensor.

  • Bank 1 sensor 1 location for this vehicle is located on the exhaust manifold back by the firewall on top of the manifold..
  • Thank you for using FixYa

Regards, Tony

Jun 19, 2011 | 2002 Dodge Grand Caravan

1 Answer

2003 Dodge Caravan SE - light comes on indicating problem with sensor heat circuit - do I worry about it now or is this something that can wait to be repaired. I haven't had problems with the heat so not...

The code you got sounds like it is for the O2 sensor heater circuit. The O2 sensor reads your fuel trim so the computer can adjust it to constantly keep the ideal ratio for the best MPG and best running engine. These sensors have to be hot to work so they have an electric heater in them. While they will still work because the exhaust will eventually heat them up, they will take longer to work and you may notice your short trip MPG will go down. Usually this only means the heater in the sensor is bad and you can just replace the sensor. The code should say something like (bank 1 sensor 2) or something like that and that will tell you which sensor you need.

Feb 28, 2011 | 2003 Dodge Caravan

2 Answers

2007 grand caravan heat takes about 10 minutes plus to get warm-is this normal? It actually blows cool air for that long, but eventually blows hot air. Replacing the thermostat which might have been...

sounds like you have a actuator problem or the heater core may be stoped up check and make sure actuator is moving if not replace

make sure both heater core hoses are hot to touch at operating temp if both are not hot replace heater core

and of course check your coolant/antifreeze and insure it is full no water no heat

Jan 15, 2010 | 2002 Dodge Grand Caravan

1 Answer

Heater slow to work

this sounds normal in very cold conditions! The air is never hot when you first start the car in any car, until the engine warms up, then the heater air will also warm. You could check your anti-freeze level for the first thing. If you don't have enough anti-freeze, it won't run through your heater to give you the proper heat

Dec 11, 2009 | 2000 Dodge Caravan

1 Answer

Cabin Heat is Intermittent / Fluctuates / Cycles

You may have air trapped in the lines to or from the heater core.
If you (still) have a real radiator cap on the radiator, remove it with a cold engine, start and run the engine allowing it to warm up while watching the water/coolant level. Make sure the heater control is set to its highest heat setting while doing this. If it is trapped air, you may see it 'belch' after the engine is warm and the engine thermostat is open. Refill as needed if this is the case.
It's more difficult without direct radiator access and may require several cycles of hot/cold to allow refilling through the overflow.

Dec 10, 2009 | 2002 Dodge Grand Caravan

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