P0379 - Timing Reference High Resolution Signal B High Resolution Timing Reference B Low Input

The ECM detected a timing-reference signal B problem: high resolution timing reference b low input.

Code Overview

The ECM detected a timing-reference signal B problem: high resolution timing reference b low input.

Common Causes

• Reference sensor problem
• Damaged wiring or connector
• Reluctor or timing signal issue

Diagnostic Steps

1. Inspect timing-reference wiring and connectors
2. Check signal integrity with scan data or scope if available
3. Look for related crank or cam sensor faults

Likely Repairs & Cost Guides

Use test results to confirm the fault before pricing the repair.

Related OBD Codes

Browse the closest code-family pages when the same fault pattern often shows up nearby.

Next Steps

Move from the code to a diagnosis path, then into repair pricing once the fault is confirmed.