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My thermostat

Tiny
J-BO
  • MEMBER
  • 2010 DODGE CHALLENGER
  • V8
  • 2WD
  • AUTOMATIC
  • 10,000 MILES
My check engine light keeps coming on and every time I take it to the mechanic they tell me it's because of the thermostat. I have a cold air intake in my 2010 Dodge Challenger, would that be the problem.
Wednesday, February 16th, 2011 AT 8:15 PM

15 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
What is the exact code number being set?
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Wednesday, February 16th, 2011 AT 8:52 PM
Tiny
J-BO
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I don't know the code that's being set. The mechanics just keep telling me it's the thermostat
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Wednesday, February 16th, 2011 AT 9:05 PM
Tiny
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So, have you changed the thermostat?
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Wednesday, February 16th, 2011 AT 9:07 PM
Tiny
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Yes
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Wednesday, February 16th, 2011 AT 9:14 PM
Tiny
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Yes I have
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Wednesday, February 16th, 2011 AT 9:15 PM
Tiny
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Apparently his diagnosis was incorrect. We would need to code number to give you any adivice.
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Wednesday, February 16th, 2011 AT 9:40 PM
Tiny
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Ok I'll get one for you
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Wednesday, February 16th, 2011 AT 9:44 PM
Tiny
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I just checked it again. I had the code but I forgot. But the reader did say that the thermostat temperature was too cold. Could that be because of my cold air intake or my aftermarket exhaust?
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Monday, February 28th, 2011 AT 12:42 AM
Tiny
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We still need an exact code number.
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Monday, February 28th, 2011 AT 12:46 AM
Tiny
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I'm not sure but I think it said P118
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Monday, February 28th, 2011 AT 12:53 AM
Tiny
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This is why we need the code number and not someone else's interpretation of what the code means. That code is for an electrical problem with the coolant temp sensor. It's reading too high meaning the signal is shorted somewhere in the circuit. It could be the sensor, the PCM or any related wiring.
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Monday, February 28th, 2011 AT 12:58 AM
Tiny
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Ok. What do you recommend?
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Monday, February 28th, 2011 AT 1:22 AM
Tiny
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Have it diagnosed properly.
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Monday, February 28th, 2011 AT 1:26 AM
Tiny
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I took it in and got it diagnosed and the light came on again this time the code is P0128
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Wednesday, March 23rd, 2011 AT 3:15 PM
Tiny
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P0128-THERMOSTAT RATIONALITY

For a complete wiring diagram, refer to the wiring information.

* When Monitored: With the engine running, start up coolant temperature between -8°C (17.6°F) and 50°C (122°F), the difference between ambient temperature and coolant temperature less than 10°C (50°F) and average vehicle speed greater than 16 kph (10 mph) for more than 18% of vehicle run time.
* Set Condition: The PCM detects that the actual engine coolant temperature does not reach the predicted engine coolant temperature within a specific time. Two trip fault. Three good trips to turn off the MIL.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. See: Initial Inspection and Diagnostic Overview Pre-Diagnostic Troubleshooting Procedure

1. CHECKING THE TEMPERATURE SENSORS.

NOTE: Diagnose and repair any ambient air temperature (AAT), intake air temperature (IAT), or engine coolant temperature (ECT) sensor circuit or rationality DTCs before continuing with this test.
NOTE: Diagnose and repair any crankshaft (CKP) or camshaft (CMP) sensor circuit or rationality DTCs before continuing with this test.
NOTE: Diagnose and repair any communication DTCs before continuing with this test.
NOTE: Verify that the Pinion Factor has been programmed correctly into the PCM.

1. Perform the diagnostic procedure for CHECKING THE TEMPERATURE SENSORS. See: Component Tests and General Diagnostics Checking the Temperature Sensors

Were any problems found?

Yes

* Repair as necessary.
* Perform the PCM VERIFICATION TEST. See: Verification Tests PCM Verification Test.

No

* Go To 2

2. CHECKING THE ENGINE COOLANT TEMPERATURE SENSOR OPERATION.

1. Perform the diagnostic procedure for CHECKING THE ENGINE COOLANT TEMPERATURE SENSOR OPERATION. See: Component Tests and General Diagnostics Checking the Engine Coolant Temperature Sensor Operation

Were any problems found?

Yes

* Repair as necessary.
* Perform the PCM VERIFICATION TEST. See: Verification Tests PCM Verification Test.

No

* Refer to the CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. See: Initial Inspection and Diagnostic Overview Checking for an Intermittent DTC
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Wednesday, March 23rd, 2011 AT 3:21 PM

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