Most auto repairs shops charge between $75 and $150 per hour. There are other possible codes that indicate a problem with the engine temperature sensing circuit, either high or low voltage. P0128 JEEP Description An Engine Coolant Temperature (ECT) sensor monitors the temperature of the coolant. 2018 Jeep Wrangler « Back to Wrangler TSBs ... P0128 - Thermostat Rationality(Sales Codes NA1 with NBQ or NB6 Only - APAC and EMEA Only). This is a comprehensive list, so to easily search for your Jeep Wrangler check engine light code, check out these keyboard shortcuts. There are NO other codes - P0128-THERMOSTAT RATIONALITY - coolant level in radiator not tank, thermostat issue, AAT issue Many codes will effect other systems - … Engine light came on 1 day ago. The fan can come on at any time, 8L90E Specs, Performance, and Identification, TH400 Transmission Specs, ID, and Common Problems, Jeep Renegade P0128: Coolant Thermostat – Below Temp, Jeep Liberty P0128: Coolant Thermostat – Below Temp, Chevy Impala: Brake Lights Stuck On → Diagnosis. P0128 is a relatively common OBDII trouble code. My check engine light just came on, but the Jeep still runs good. 2015 Jeep Wrangler. If you have a code P0128, thermostat rationality, that would indicate a thermostat partially stuck open and not maintaining proper coolant temperature. The plaintiffs claim they leased a new 2013 Jeep Wrangler in 2013. Good luck figuring out what is going on with your Wrangler! If your ride starts to overheat, immediately replace the Jeep Wrangler thermostat with a durable part from AutoZone. If it is easy to pinch the hose, typically water will be flowing through it. Your IP: 83.169.20.76 I did a DTC code check with my Superchips and got a DTC code of P0128-Thermostat Rationality....which leads me to thing that the thermostat is stuck open. There aren’t many symptoms with P0128, unless it gets cold. A code P0128 Jeep may mean that one or more of the following has happened: Low engine coolant level Leaking or stuck open thermostat Faulty cooling fan (running too much) Faulty coolant temperature (ECT) sensor Faulty intake air temperature (IAT) sensor It is triggered when your Jeep Renegade‘s coolant temperature fails to reach the proper operating temperature. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policyunless you have disabled them. Your order may be eligible for Ship to Home, and shipping is free on all online orders of $35.00+. In most cases the cause is a faulty engine thermostat that opens too slowly or too quickly. It should be noted that most modern fuel injected engines to like to run at 200+ degrees. Symptoms- CEL Possible causes - Insufficient warm up time - Low engine coolant level - Leaking or stuck open thermostat - Faulty MAP sensor Jeep Wrangler P0128: Coolant Thermostat – Below Temp November 5, 2018 by Jason P0128 is a relatively common OBDII trouble code. By maintaining your vehicle, you're able to enjoy its durability and reliability for years to come. You purchased it for its rugged utility. I have 2012 jeep JK wrangler sport. Most auto repairs shops charge between $75 and $150 per hour. Insert key and turn the ignition On-Off-On-Off then back to the On position and then notice the codes given in the odometer read-out.B1402 - FRONT LEFT AUDIO SPEAKER OUTPUT CIRCUIT HIGHB1403 - FRONT LEFT A FOUND CODE P0128- THERMOSTAT RATIONALITY PROBLEM. What is the cost to diagnose the P0128 JEEP code Labor: 1.0 The cost to diagnose the P0128 JEEP code is 1.0 hour of labor. Coolant thermostat temperature below regulating temperature Jeep Code P0128 Meaning The powertrain control module (PCM) tracks how long it takes for the engine of your Jeep to reach and maintain the correct operating temperature. Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) What the P0128 code means. Any connection or thoughts? Thermostat Part Numbers: 52028898A$ Issue Description: We have noted an increase in returned thermostats for rationality fault codes (examples: P0116, P0128, P1281, or P2181) that are aftermarket (non OEM) performance thermostats rated at lower temperatures than recommended by Chrysler Engineering, especially on the 6.1L SRT Hemi. 2018 (JL) Jeep Wrangler NOTE: This bulletin applies to vehicles within the following markets/countries: North America, APAC, EMEA and LATAM. • How to repair P0128 Jeep code Thermostat Rationality. Letting them run too cool can problems after an extended period of time. Cost of diagnosing the P0128 JEEP code Labor: 1.0 The cost of diagnosing the P0128 JEEP code is 1.0 hour of labor. August 27, 2015 ; ... P0128 - Thermostat Rationality P0129 - Barometric Pressure Out-Of-Range Low P0131 - O2 Sensor 1/1 Circuit Low P0132 - O2 Sensor 1/1 Circuit High Jeep JK Computer Diagnostic Codes B1001 ‐ A/C SWITCH REQUEST INPUT CIRCUIT LOW (ATC & MTC) ... P0128 ‐ THERMOSTAT RATIONALITY P0129 ‐ BAROMETRIC PRESSURE OUT‐OF‐RANGE LOW ... A forum community dedicated to Jeep Wrangler JK owners and enthusiasts. Kimberly K Anderson March 22, 2019. Jeep Wrangler JK Diagnostic Code List | 2007-2018. ... P0111 - Intake Air Temperature Sensor Rationality P0112 - Intake Air Temperature Sensor Circuit Low ... P0128 - Thermostat Rationality P0129 - Barometric Pressure Out-Of-Range Low P0131 - … • It can be really difficult to tell this in a vehicle that doesn’t have a temperature gauge. 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