Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Pcm Code E037, Shorted Mat Sensor Circuit: Action
PCM turns on SERVICE ENGINE SOON light. PCM substitutes 104°F (40°C) for MAT when coolant temperature is greater than or equal to 104°F (40°C). PCM substitutes coolant temperature for MAT when coolant temperature is less than or equal to 104°F (40°C).
- With a shorted MAT sensor, PCM parameter ED05 should indicate 148°C or greater. If ED05 does not indicate 148° or greater, sensor is not shorted. See NOTE ON INTERMITTENTS.
- Checks for sensor short or circuit No. 472 shorted to ground. If PCM parameter EDO5 stays at 142-151°C with sensor unplugged, circuit is shorted to ground.
- MAT sensors can be damaged by a backfire in intake. If vehicle has had more than one MAT sensor replaced, check for signs of backfire and high intake manifold temperatures due to improper valve train operation.
- Fault is most likely at PCM connector or PCM. Check for damaged PCM terminals or poor connection before replacing PCM.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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