Timing Reference High Resolution Signal B Too Few Pulses
The PCM detects that the engine position sensor B is producing too few pulses, indicating a malfunction in the high-resolution timing reference signal. This affects engine timing control and can cause rough running, poor performance, or starting issues.
What You Might Notice
- Check Engine Light illuminated
- Rough idle or hesitation during acceleration
- Engine timing issues or misfires
- Difficulty starting the engine
- Reduced fuel economy
Most Common Causes
- 1
Faulty crankshaft position sensor B
The sensor may be worn, damaged, or failing, preventing it from generating the correct number of pulses for the PCM to read.
- 2
Damaged reluctor ring or tone ring
Physical damage, corrosion, or wear on the reluctor wheel reduces the number of detectable pulses as it rotates.
- 3
Wiring problems or connector corrosion
Damaged wiring, loose connections, or corroded connectors between the sensor and PCM disrupt the signal transmission.
- 4
Contaminated or dirty sensor
Oil buildup, dirt, or metallic debris on the sensor face reduces its ability to detect the magnetic field properly.
How to Diagnose It
- 1
Check Faulty crankshaft position sensor B — The sensor may be worn, damaged, or failing, preventing it from generating the correct number of pulses for the PCM to read.
- 2
Check Damaged reluctor ring or tone ring — Physical damage, corrosion, or wear on the reluctor wheel reduces the number of detectable pulses as it rotates.
- 3
Check Wiring problems or connector corrosion — Damaged wiring, loose connections, or corroded connectors between the sensor and PCM disrupt the signal transmission.
- 4
Check Contaminated or dirty sensor — Oil buildup, dirt, or metallic debris on the sensor face reduces its ability to detect the magnetic field properly.
How to Fix It
- 1
Inspect and clean crankshaft position sensor B
Remove the sensor and inspect for dirt, oil, or damage. Clean the sensor face with a soft cloth and reinstall, then clear the code and test.
- 2
Replace crankshaft position sensor B
If the sensor is faulty or damaged beyond cleaning, remove the old sensor and install a new OEM or quality replacement.
- 3
Repair wiring and connectors
Check all wiring harnesses and connectors related to sensor B for corrosion, loose connections, or damage. Clean connectors or replace damaged wiring.
- 4
Inspect reluctor ring for damage
Visually inspect the reluctor wheel or tone ring for cracks, missing teeth, or severe corrosion. If damaged, the component may need replacement.
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