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.
- 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.
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Check crankshaft position sensor air gap. Should be 0.5-1.5mm from the reluctor wheel.
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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.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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