Fuel Injection Pump Speed/Timing Sensor Circuit Low
The P2377 code means the vehicle's onboard diagnostic system has detected: Fuel Injection Pump Speed/Timing Sensor Circuit Low. This is a serious severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $300 - $1,500 (parts and labor)
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Common Symptoms
- Check Engine Light on
- Engine hard starting or no start condition
- Rough idle and engine knocking
- Excessive smoke from exhaust
- Significant power loss
Probable Causes (Ranked by Likelihood)
- Short to ground in pump timing/speed sensor wiring Very High
- Faulty fuel injection pump sensor High
- Corroded sensor connector Moderate
- PCM driver circuit failure Low
Frequently Asked Questions
What does P2377 mean?
P2377 relates to the fuel injection pump system: Fuel Injection Pump Speed/Timing Sensor Circuit Low. This code is most commonly seen on diesel vehicles where precise pump timing is critical.
Can I drive with P2377?
Drive only short distances to a shop. Fuel injection pump issues can cause hard starting, poor performance, and potential engine damage from incorrect timing.
How much does it cost to fix P2377?
Costs range from $300 for sensor or wiring repairs to $1,500+ if the injection pump itself needs replacement or rebuilding.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
-
Retrieve P2377 and check for related fuel system codes
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Monitor injection pump timing and speed data with a scan tool
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Inspect injection pump sensor wiring and connectors for damage
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Verify injection pump timing alignment marks are correct
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
Commonly Affected Vehicles
- 2010-2018 Volkswagen Jetta 2.0L I4
- 2010-2020 Volkswagen Jetta 1.4L Turbo I4
- 2011-2017 Ford F-150 5.0L V8
- 2012-2020 BMW 328i 3.0L I6
Related Codes
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