P1287 Code: Meaning, Symptoms, Causes & Fix

Overview

Symptoms

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

Common causes

• Reference/ground fault affecting fuel pulse in range but higher than expected
• Sensor output out of expected upper range
• Connector pin damage/corrosion or harness stress near related components

How to diagnose P1287

1. Confirm P1287 and capture freeze-frame data with a professional scan tool.
2. Inspect wiring, connectors, and grounds related to fuel pulse in range but higher than expected for obvious defects.
3. Compare live data against expected upper threshold and verify reference voltage.
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 P1287

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

Can you drive with P1287?

Most vehicles can be driven short-term with P1287, 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 (high) in the fuel pulse in range but higher than expected circuit/system.
3. Apply the required relearn/adaptation procedure if specified by service information.
4. Road-test and verify P1287 remains cleared under the conditions that originally set the code.

Fix options

• Replace failed sensor if signal remains high.
• Perform relearn/adaptation if required.
• Clear DTCs and verify with live data and completed drive cycle.

Typical repair cost

$220-$1100

Common mistakes when diagnosing P1287

• 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.

P1287 in common vehicles

P1287 appears across makes such as Mazda, Subaru, Lexus, Jeep. Failure patterns differ by platform: wiring routes, software calibration, and component supplier revisions can change root cause.

Frequently asked questions

What causes P1287?

P1287 is commonly set by high faults affecting fuel pulse in range but higher than expected.

How much does it cost to fix P1287?

For P1287, repair costs are typically $220-$1100 depending on exact root cause, labor rates, and part quality.

Can I clear P1287 without repair?

You can clear P1287 temporarily, but the code usually returns until the underlying fault is corrected.

Helpful tools

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