P0376
UniversalTiming Reference High Resolution Signal B Too Many Pulses
The engine controller monitors a high-resolution timing reference signal identified as B to help track engine timing. This code means it detected more pulses than expected in that signal. Depending on how consistently the signal is affected, the engine may run poorly, stall, or have trouble starting; the code does not by itself prove that a particular part has failed.
⚠️ Before You Begin (Safety First)
If the engine stalls, runs very roughly, or cannot be relied on to keep running, stop driving when it is safe and arrange diagnosis. Unexpected stalling can create a traffic hazard. If the vehicle runs normally, avoid demanding driving until the fault is checked.
Common Symptoms
- The check-engine light may be on, with no obvious change in how the vehicle runs.
- A disrupted timing reference can cause rough running or hesitation because the controller may not receive reliable timing information.
- The engine may stall or be difficult to start if the signal is sufficiently affected.
- Symptoms may come and go if the signal fault is intermittent.
Common Causes
- A fault in the component or circuit that produces timing reference signal B.
- A loose, damaged, corroded, or poorly connected electrical connector or wire.
- An electrical short, interference, or other wiring condition that creates extra signal pulses.
- A fault in related signal-processing circuitry; this should be considered only after the signal source and wiring are checked.
Diagnostic Steps
- Note whether the engine runs normally, stalls, or has starting trouble; avoid driving if it stalls or runs unpredictably.
- With the engine off, visually inspect accessible wiring and connectors related to the engine timing reference system for damage, looseness, or corrosion. Do not pull on wires or probe terminals without the correct service information.
- Check for other stored diagnostic codes and record them before clearing anything, since related codes may help identify whether the issue is in the signal source or its circuit.
- If the fault returns or symptoms are present, arrange diagnosis using model-, year-, and engine-specific service information rather than replacing a part based on this code alone.
When to Call a Professional
Check stored codes and freeze-frame data, then inspect the signal circuit and connectors using vehicle-specific service information. A technician can compare signal B with the expected timing pattern using appropriate electrical test equipment, check for wiring faults or signal interference, and confirm the cause before replacing components.
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Commonly Asked Questions
Does P0376 prove that a timing sensor needs replacement?
No. It identifies an excessive-pulse condition in timing reference signal B. The signal-producing component, wiring, connectors, interference, or related circuitry may need checking before a repair is chosen.
Can the vehicle have this code without noticeable symptoms?
Yes. A fault may be intermittent or may not noticeably affect engine operation at the time it is checked.
What does “too many pulses” mean?
The controller detected more signal events on timing reference signal B than it expected. The code does not specify the exact cause or identify a failed part.
Can I keep driving with P0376?
If the engine runs normally, a cautious trip for diagnosis may be possible, but avoid demanding driving. If it stalls, runs very roughly, or is difficult to keep running, stop when safe and arrange assistance.
Browse Available Code Guides
Previous and next available guides in database record order, across makes. Adjacent entries may share a code number and do not necessarily describe related faults.