Error code

OBD2 P0338

OBD2P0338
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Crankshaft Position Sensor 'A' Circuit High.

Severity

moderateThe vehicle may be drivable but with reduced performance and fuel efficiency.

Summary

P0338 indicates that the crankshaft position sensor 'A' is sending an abnormally high voltage signal to the engine control module (ECM). This sensor is crucial for measuring engine speed and timing.

Symptoms

  • Poor fuel economy
  • Engine cranks but won't start
  • Difficulty starting the engine
  • Lack of engine power
  • Poor acceleration

Common Causes

  • Dead crankshaft position sensor (CKP)
  • Poorly aligned CKP sensor
  • Electrical problems such as open or short circuits in the wiring harness

Diagnosis

  1. Check for proper alignment of the CKP sensor
  2. Inspect wiring harness between ECM and CKP sensor for damage or corrosion
  3. Use a digital multimeter to check voltage signals from the CKP sensor

Fixes

  • Replace faulty crankshaft position sensor

FAQ

Can I drive with P0338?

You can drive but expect reduced performance and fuel efficiency.

What causes a high voltage signal from the CKP sensor?

A dead or misaligned crankshaft position sensor, or electrical issues in the wiring harness.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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