P0338 Code - Crankshaft Position Sensor 'A' Circuit High Input

What Does P0338 Mean?

OBD-II Code Decreased engine performance is defined as a Crankshaft Position Sensor "A" Circuit High

The Crankshaft Position Sensor measures the exact rotational speed and position of the crankshaft. This provides a critical data signal used by the Powertrain Control Module (PCM) to control Ignition Spark Timing and Fuel Delivery. This sensor may be built into the distributor on older vehicles. When the PCM detects an irregular signal or no signal, it will set code P0338.

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What are the common causes of P0338 ?

Common failures in the CPS system include a damaged crankshaft position sensor, sensor connector, or electrical wiring. Technicians have reported that the presence of oil leaking on the outside of the engine often causes deteriorated insulation on wiring and may lead to shorted and loose connectors. Broken crankshaft reluctor rings or missing teeth may also cause this code to be set. Broken timing belts that are wound around crankshaft and camshaft timing gears can often result in damage to CPS system components and wiring. Sensor and wiring failure often reveals itself as an open or shorted (power or ground) circuit. The PCM could also be the culprit but this scenario occurs rarely.



How do you troubleshoot P0338 ?

The following are some of the repairs that mechanics might use when they are trying to fix the P0338 code.

• They will use the OBD-II sensor to learn more about the vehicle’s issues.
• The mechanic will reset the codes and then test the vehicle to see if they return.
• They check the connectors and wiring to make sure it is connected properly and not corroded.
• Check the relator rings and replace if needed.
• Check the timing belt and replace if needed.
• Replace the powertrain control module. This is rarely the cause of the issue though.

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