P0369 critical

Timing Reference High Resolution Signal A Too Few Pulses

The P0369 code means the vehicle's onboard diagnostic system has detected: Timing Reference High Resolution Signal A Too Few Pulses. This is a critical severity code.

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Keep driving?: No -- stop driving
DIY difficulty: hard
Estimated cost: $100 - $800 (parts and labor)

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Common Symptoms

Check Engine Light on
Engine may not start
Engine stalls or runs very rough
Erratic RPM readings on tachometer

Probable Causes (Ranked by Likelihood)

Damaged crankshaft position sensor reluctor wheel Very High
Faulty crankshaft position sensor High
Wiring damage to crank sensor Moderate
Timing chain/belt jumped or stretched Low

Step-by-Step Diagnostic Procedure

Read crankshaft sensor signal with an oscilloscope. Look for missing or irregular pulses.
Inspect the crankshaft reluctor wheel (tone ring) for missing or damaged teeth.
Check crankshaft position sensor air gap. Should be 0.5-1.5mm from the reluctor wheel.
Verify timing chain or belt has not jumped by checking camshaft to crankshaft alignment marks.

Frequently Asked Questions

What is a high resolution timing signal?

The crankshaft reluctor wheel has many teeth that generate a high-resolution signal allowing the PCM to precisely track crankshaft position and engine RPM.

Can a damaged reluctor wheel be repaired?

No, a damaged reluctor wheel must be replaced. On many engines, this requires removing the harmonic balancer or flywheel.

Is P0369 a serious code?

Yes, without accurate crankshaft position information, the engine cannot time ignition and fuel injection correctly. This can cause no-start or severe misfire conditions.