P0126 Code - Insufficient Coolant Temperature for Stable Operation

What Does P0126 Mean?

In order for the Powertrain Control Module or PCM to effectively control the fuel and ignition systems while, at the same time, minimize the emissions output from a vehicle, the engine cooling system must reach a critical operating temperature. This temperature is typically between 160-170 degrees F and must be reached within 15 minutes after a 'stone cold' start. If the weather is extremely cold, say 10 or more degrees below zero, the coolant temperature must rise at least 70+ degrees from the 'stone cold' starting temperature. A 'stone cold' start is achieved when the vehicle is started after sitting with its engine off for at least 8 consecutive hours. If the coolant temperature stays below the 160-170 degree range or wanders above and below this level, the PCM can't rely on the exhaust oxygen feedback data it receives from the oxygen sensors in the exhaust system. When this occurs, the PCM must rely on a crude 'limp home' type of fuel and ignition control program. This raises the level of exhaust gas pollution to unacceptably high levels and will trigger the check engine light.

What are the common causes of P0126 ?

This could be caused by insufficient engine warm-up time, a faulty coolant temperature sensor, a low engine coolant condition, or a faulty thermostat.

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How do you troubleshoot P0126 ?

The engine system, in conjuction with the engine control module (ECM)/powertrain control module (PCM), activates the P0126 code solenoid valve to control oil pressure to the engine mechanism that is installed in the valve system to switch valve timing between Low and High.If the engine solenoid valve has an open or short circuit, a DTC is stored.



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