P0377
Timing Reference High Resolution Signal B Too Few Pulses
P0377 is an OBD-II diagnostic trouble code meaning: Timing Reference High Resolution Signal B Too Few Pulses. Common causes: damaged or chipped teeth on sensor b drive, sensor clogged with metal shavings. Estimated repair cost: $22–167.
Symptoms
- Unstable idle with periodic dips
- Misfires
- Jerks and dips during acceleration
- Increased fuel consumption
- Check Engine Light Is On
Causes
- Damaged or chipped teeth on sensor B drive
- Sensor clogged with metal shavings
- Unstable contact in the sensor connector
- Worn sensor with unstable signal
- Damage to the shielding sheath of the signal wire (crosstalk)
How to Fix
- Read codes, check for misfire codes P030x
- Inspect the drive disc through the inspection window or after removing the cover
- Clean the sensor from metal shavings, check the gap
- Inspect and clean sensor connector B
- Check signal wire shielding
- Replace a damaged drive disk or sensor
Related codes
Error P0377 by Vehicle Brand
FAQ
What does the P0377 code mean?
P0377 is an OBD-II diagnostic trouble code that indicates: Timing Reference High Resolution Signal B Too Few Pulses
What causes a P0377 error code?
The most common causes of P0377 include: Damaged or chipped teeth on sensor B drive; Sensor clogged with metal shavings; Unstable contact in the sensor connector; Worn sensor with unstable signal.
How do I fix a P0377 diagnostic trouble code?
To fix P0377: Read codes, check for misfire codes P030x. Inspect the drive disc through the inspection window or after removing the cover. Clean the sensor from metal shavings, check the gap. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0377?
Do not drive — repair immediately
How much does it cost to fix P0377?
The estimated repair cost for P0377 is $22–167. Actual cost depends on your vehicle, location, and labor rates.
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