Anyone know what Code P0128 means? - DodgeForum.com


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Anyone know what Code P0128 means?

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  #1  
Old 07-24-2011, 06:28 PM
neoncrazy101
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Default Anyone know what Code P0128 means?

My moms cars (06' Sebring Touring) check engine light came on today, when I did the key dance to get the code it was P0128, which after looking on Allpar simply means "Coolant Thermostat" Does that mean it needs to be replaced? I've never seen a code for a thermostat before though so I'm not sure.
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Old 07-24-2011, 10:20 PM
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shrpshtr325
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our post in the 1st gen durango section says

Quote:
P0128 Cooling Sys Error / Thermostat Perf
IMO, clear it and see if it comes back, if so replace the temp sensor and/or the stat
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Old 07-24-2011, 11:09 PM
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master tech
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THis post should have been moved to the stratus section, because the stratus/sebring are the same body code (JA).
Symptom:
P0128-THERMOSTAT RATIONALITY
When Monitored and Set Condition:
P0128-THERMOSTAT RATIONALITY
When Monitored: The engine running. During cold start.
Set Condition: The PCM predicts a coolant temperature value that it will compare to the
actual coolant temperature. If the two coolant temperature values are not within 10C
(50F) of each other an error is detected. Two Trip Fault.
POSSIBLE CAUSES
GOOD TRIP EQUAL TO ZERO
LOW COOLANT LEVEL
OTHER POSSIBLE CAUSES
SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
MONITOR ENGINE COOLANT TEMPERATURE
TEMPERATURE SENSOR VOLTAGE BELOW 1.0 VOLT
SIGNAL CIRCUIT OPEN
SENSOR GROUND CIRCUIT OPEN
SIGNAL CIRCUIT SHORTED TO GROUND
SIGNAL CIRCUIT SHORTED TO SENSOR GROUND
PCM LOW
PCM HIGH
TEST ACTION APPLICABILITY
1 NOTE: If any ECT,AAT, CMP or CKP sensor DTCs have set along with P0128,
diagnose them first before continuing.
NOTE: Ensure that Pinion Factor has been programmed correctly into the
PCM.
Ignition on, engine not running.
With the DRBIIIt, read DTCs and record the related Freeze Frame data.
Is the Good Trip displayed and equal to zero?
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Old 07-25-2011, 01:06 AM
steak59
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A bad Radiator Cap can set this code too, Would be a cheap thing to start. Tho, most of the time is a bad thermostat.
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Old 07-25-2011, 07:27 AM
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i did not know that master tech, thanks for the info
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Old 01-17-2015, 03:20 PM
mr.maximnus
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Default 2003 dodge stratus

Hey all, I have 2003 dodge stratus SXT I noticed my engine light was blinking the day After I noticed I need a exhaust pipe. I did research and my code on car is P0128.

Should I stop driving my car or is it safe to drive?????? Please help I would appreciate it.
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Old 01-18-2015, 09:36 AM
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Quote:
Originally Posted by mr.maximnus View Post
Hey all, I have 2003 dodge stratus SXT I noticed my engine light was blinking the day After I noticed I need a exhaust pipe. I did research and my code on car is P0128.

Should I stop driving my car or is it safe to drive?????? Please help I would appreciate it.
If the light is constantly blinking, then no, it is not safe to drive. Flashing is indicative of a serious misfire And you would be noticing performance problems. If it is on solid with the code P0128, refer to the post above describing the code and the corrective actions required.
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Old 01-19-2015, 06:32 AM
mr.maximnus
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Default thank you my mechanic is changing my spark plugs we will see if this works

Quote:
Originally Posted by jkeaton View Post
If the light is constantly blinking, then no, it is not safe to drive. Flashing is indicative of a serious misfire And you would be noticing performance problems. If it is on solid with the code P0128, refer to the post above describing the code and the corrective actions required.

I appreciate your help
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