If other codes are present, they must be addressed first.
#COOLANT THERMOSTAT CHECK ENGINE LIGHT CODE#
Use FIXD to s can your vehicle to verify P0128 is the only code present. STEP 1: USE FIXD TO ENSURE NO OTHER ENGINE CODES ARE PRESENT. Tools/parts needed (our top picks from Amazon): This repair is easy enough for beginner-level DIYers to attempt. Diagnosis can require some specialized equipment beyond what the FIXD Sensor can provide, but, on most vehicles, this is still a beginner-level diagnosis and repair for DIYers. If you’d like to try to fix code P0128 at home without throwing money at parts, you’ll want to follow the steps below for proper diagnosis. For each possible repair, the estimated cost of repair includes the cost of the relevant parts and the cost of labor required to make the repair. When it comes to making repairs associated with the P0128 code, one or more of the below repairs may be needed to solve the underlying issue. From there, a shop will be able to give you an accurate estimate for repairs to fix your P0128 code. Many, if not most, shops will apply this diagnosis fee to any required repairs if you have them perform the repairs for you. Depending on the shop’s labor rate, this typically costs somewhere between $75-$150. If you take your car to a shop for diagnosis, most shops will start with an hour of “diag time” (the time spent in labor diagnosing your specific issue). These shops can not only help you figure out what’s going wrong before you waste time and money on the wrong parts, but they also offer a minimum 12-month, 12,000-mile warranty and stand behind all their estimates with guaranteed fair pricing. If your engine is running lean and you’re not comfortable diagnosing this issue at home, we recommend finding a RepairPal-certified shop to pinpoint the problem and give an accurate estimate for repairs. >Click here to get FIXD for just $19.99 for a limited time! Using the live data function of the FIXD sensor and app allows you to read and analyze engine temperatures to properly diagnose a P0128 code. With a P0128 code, the first step is to get it properly diagnosed to figure out what is causing the malfunction in the coolant temperature circuit. Faulty wiring for coolant temperature circuit.Faulty/stuck open thermostat (most common).If either fault is recorded again on the next engine startup, code P0128 is triggered. The PCM will record if either of these two criteria is not met. Additionally, once the 160º F threshold is achieved, the recorded engine temperature must not fall below 160º F during operation. Most ECMs mandate that the engine coolant temperature sensor record temperatures above 160º F within 15 minutes of the engine starting. When the correct engine operating temperature is reached, the powertrain control module orders the fuel system to enter a “closed-loop” where readings from the oxygen sensors are used to maintain the efficient air to fuel ratio of 14.7:1. The engine control module (ECM) tracks how long it takes for the engine of a vehicle to reach and maintain the correct operating temperature. Use the FIXD Sensor and app to diagnose your P0128 at home, access our Mechanic Hotline, see the most likely repair and cost, and much more, saving you time and money! This DTC can be triggered by a missing or stuck open thermostat, a faulty coolant temp sensor, or damaged wiring to the coolant temp sensor circuit. Diagnosis: It is important to complete the entire diagnostic process when diagnosing the P0128 code.Repair Urgency: Get this code fixed withing the next month to prevent.Issue Severity: LOW– Continued driving for a short period of time is okay.P0128 definition: Coolant Thermostat Temperature Below Regulating Temperature.
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