P0373 Code - Timing Reference High Resolution Signal 'A' Intermittent/Erratic Pulses

What Does P0373 Mean?

A P0373 means that your powertrain control module (PCM) has detected an irregularity in the high resolution timing reference signal. The “A” refers the area of the system circuitry than to a particular component in your vehicle. If the PCM detects variations in the high-resolution engine timing signal that exceed a set number of degrees, the P0373 code will be stored and your Service Engine Soon lamp will come on.

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What are the common causes of P0373 ?

Professional technicians report that the most common causes of this type of code include defective camshaft, crankshaft, and distributor position sensors. Following closely behind is mechanical distributor failure, which is common in high-mileage rear-wheel drive domestic applications. Faulty, damaged, or corroded wiring and electrical connectors are also contributed with failures of a similar nature. PCM failure is possible but rarely occurs.



How do you troubleshoot P0373 ?

It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. Oxygen sensors signal the engine management computer the amount of oxygen present in the exhaust, which is used in determining and controlling the fuel ratio.

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