P0370 Code - Timing Reference High Resolution Signal 'A' Malfunction

What Does P0370 Mean?

OBD-II Code Decreased engine performance is defined as a Timing Reference High Resolution Signal "A"

The engine control module (PCM) sends a duplicate signal of the crankshaft position sensor (CKP) to the Fuel Injection Control Module (FICM). If the signal to the FICM becomes corrupt, the PCM will set code P0370.

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What are the common causes of P0370 ?

Some common causes of code P0370 could include the following-

• Damaged, burnt, shorted, disconnected, or corroded wiring and/or connectors
• Defective engine position sensor
• Defective or clogged reluctor ring
• Failed or failing PCM. Note that this is a rare event, and the fault must be sought elsewhere before any control module is replaced

How do you troubleshoot P0370 ?

Check to make sure they are not burnt or corroded. If in doubt, get some Electrical Contact cleaner at any parts store if cleaning of the terminals is needed. 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. Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed.



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