P1587 — Electronic Throttle Monitor Data Available

How do I diagnose P1587 myself?

Start with a scan: confirm P1587, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the throttle and intake air metering, and verify the suspect component against live data before buying parts.

What does OBD2 code P1587 mean?

OBD2 code P1587 flags a problem with the throttle and intake air metering (electronic throttle monitor data available). Short, gentle driving to a shop is usually possible. Common culprits: contaminated or failed MAF/MAP sensor, intake air leaks after the MAF sensor, failed electronic throttle motor.

What are the symptoms of P1587?

Drivers most often notice: poor throttle response, stalling when coming to a stop, Check Engine Light on, limp-home mode with reduced power.

Is it safe to drive with P1587?

Drive with caution. Many throttle faults put the car into limp mode with limited power — enough to reach a shop, not for highway trips. If the engine stalls or the pedal stops responding, do not drive.

How much does it cost to fix P1587?

Replace the throttle body assembly — $250–$700; Clean the throttle body — $80–$200; Replace the MAF or MAP sensor — $150–$400. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

When the engine control unit detects that the electronic throttle control system is not operating within expected parameters, it logs trouble code P1587. This diagnostic code signals that throttle body and intake air metering functions are not behaving as the computer programmed them to. Officially defined as "Electronic Throttle Monitor Data Available," P1587 falls under the powertrain category, meaning it affects engine and potentially transmission operation.

The ECU does not set this code after a single anomalous reading. P1587 requires the fault condition to repeat under specific driving circumstances before the check engine light illuminates. This threshold exists to prevent false triggers from temporary glitches. When P1587 is stored, the module captures freeze frame data recording engine load, RPM, coolant temperature, and vehicle speed at the exact moment the fault occurred. This snapshot is invaluable during diagnosis—recreating those precise conditions is the fastest path to identifying the root cause.

The electronic throttle system relies on a motor-driven throttle plate controlled directly by the ECU rather than a mechanical cable. The mass airflow sensor or manifold absolute pressure sensor measures incoming air, and the throttle position sensor reports the plate angle. When these readings do not correlate correctly with driver input, P1587 results.

Symptoms of P1587

When P1587 is active, drivers typically notice one or more of the following:

• Hesitant or unresponsive throttle when pressing the accelerator
• Engine stalls when decelerating to a stop
• Check Engine Light remains illuminated
• Vehicle enters limp-home mode with noticeably reduced power output
• Rough, fluctuating, or higher-than-normal idle speed

Common Causes of P1587

Several conditions can trigger P1587, ranging from simple maintenance issues to component failure:

• Dirty or faulty mass airflow sensor (MAF) or manifold absolute pressure sensor (MAP)
• Failed electronic throttle motor
• Carbon-fouled throttle plate or sticky throttle body mechanism
• Air leaks in the intake system downstream of the MAF sensor
• Wiring harness damage, corrosion, or loose connectors affecting throttle circuitry
• Failed throttle position sensor

Diagnosing P1587

Follow these steps to isolate the cause of P1587 accurately:

1. Connect an OBD2 scanner, retrieve code P1587, and record the associated freeze frame data showing what was happening when the fault triggered.
2. Check for related diagnostic trouble codes and research any applicable technical service bulletins for your specific make and model—manufacturers publish software updates and known fixes.
3. Perform a visual inspection of the wiring harness and connectors serving the throttle body and air metering sensors, looking for chafing, corrosion, or disconnection.
4. Remove and inspect the throttle body for carbon buildup; verify the plate opens and closes freely without binding.
5. Monitor live data streams for throttle position and MAF/MAP readings while operating the accelerator—values should change smoothly and proportionally.
6. Clear the code, drive the vehicle through conditions matching the freeze frame, and verify P1587 does not reappear.

Repair Options for P1587

Address the most accessible and affordable possibilities before replacing major components:

• Throttle body assembly replacement: $250–$700
• Throttle body cleaning service: $80–$200
• MAF or MAP sensor replacement: $150–$400

Total Repair Cost for P1587

Actual repair costs for P1587 depend entirely on which component is at fault. At independent shop rates in the United States, throttle body cleaning typically runs $80–$200, sensor replacement averages $150–$400, and full throttle body assembly replacement ranges from $250–$700. Most P1587 repairs fall somewhere within that $80–$700 window. A methodical diagnosis before purchasing parts prevents unnecessary expense—the priciest solution is rarely where you should start.

Driving Safety Verdict

Drive with caution when P1587 is present. Throttle control failures often force the engine into limp-home mode, allowing limited power suitable only for reaching a repair facility, not sustained highway driving. If the engine stalls unexpectedly or the accelerator pedal becomes unresponsive, stop driving immediately and arrange towing.