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)
Best-selling code reader on Amazon. Reads and clears check engine codes on any 1996+ vehicle. Under $30.
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
Essential for diagnosing sensor codes, checking voltage, and testing circuits. Under $15 and pays for itself on the first job.
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
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
Step-by-Step Diagnostic Procedure
-
Retrieve P2377 and check for related fuel system codes
-
Monitor injection pump timing and speed data with a scan tool
-
Inspect injection pump sensor wiring and connectors for damage
-
Verify injection pump timing alignment marks are correct
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.
Sources
This page is built from documented references. Verify against your own service info before repair work.
Explore More
Was this helpful?
Share carcodefinder.com with a friend who needs to decode their check engine light.