P0255 Code: Meaning, Symptoms, Causes & Fix

Overview

Symptoms

• engine may stall at idle
• hard starting
• reduced fuel economy

Common causes

• Connector pin fit issue affecting injection pump fuel metering control a intermittent (cam/rotor/injector)
• Temperature/vibration related circuit dropout
• Connector pin damage/corrosion or harness stress near related components

How to diagnose P0255

1. Confirm P0255 and capture freeze-frame data with a professional scan tool.
2. Inspect wiring, connectors, and grounds related to injection pump fuel metering control a intermittent (cam/rotor/injector) for obvious defects.
3. Reproduce the fault with harness movement and heat/vibration checks.
4. Check for related DTCs to identify the root-cause chain before replacing parts.
5. After repair, clear codes and confirm readiness monitors complete without recurrence.

Severity of code P0255

Moderate: This code is moderate severity: the vehicle may still operate, but fault progression can increase repair cost over time.

Can you drive with P0255?

Most vehicles can be driven short-term with P0255, but postpone heavy load/highway driving until repaired.

If the warning lamp is flashing or drivability/safety is affected, avoid driving and diagnose immediately.

How to fix it (step-by-step)

1. Repair obvious wiring/connector faults first to prevent repeat parts replacement.
2. Address the root fault mode (intermittent) in the injection pump fuel metering control a intermittent (cam/rotor/injector) circuit/system.
3. Apply the required relearn/adaptation procedure if specified by service information.
4. Road-test and verify P0255 remains cleared under the conditions that originally set the code.

Fix options

• Repair intermittent connector contact.
• Retest after thermal/vibration simulation.
• Clear DTCs and verify with live data and completed drive cycle.

Typical repair cost

$220-$1100

Common mistakes when diagnosing P0255

• Replacing parts without verifying voltage, ground, and signal integrity first.
• Ignoring related stored/pending codes that indicate upstream faults.
• Skipping post-repair verification drive cycle and readiness checks.

P0255 in common vehicles

P0255 appears across makes such as Nissan, Hyundai, Kia, Volkswagen. Failure patterns differ by platform: wiring routes, software calibration, and component supplier revisions can change root cause.

Frequently asked questions

What causes P0255?

P0255 is commonly set by intermittent faults affecting injection pump fuel metering control a intermittent (cam/rotor/injector).

How much does it cost to fix P0255?

For P0255, repair costs are typically $220-$1100 depending on exact root cause, labor rates, and part quality.

Can I clear P0255 without repair?

You can clear P0255 temporarily, but the code usually returns until the underlying fault is corrected.

Helpful tools

• Estimate repair cost
• Decode your VIN
• Calculate fuel cost