OBD Code B1987: Pedal Forward / Rearward Motor Stalled

Q: What does OBD code B1987 mean?

Pedal Forward / Rearward Motor Stalled. The electric motor that adjusts your gas pedal position forward and backward has stopped moving or is stuck. Think of it like a power window motor that won't budge—the motor itself may be seized, disconnected, or lacking power.

Q: What are the symptoms of fault code B1987?

Pedal position does not respond to adjustment commands, Check Engine Light illuminated, Inability to calibrate or initialize pedal during startup

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What This Actually Means

In plain language — no jargon

The electric motor that adjusts your gas pedal position forward and backward has stopped moving or is stuck. Think of it like a power window motor that won't budge—the motor itself may be seized, disconnected, or lacking power.

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Symptoms You May Notice

3 known symptoms for this code

Pedal position does not respond to adjustment commands

Check Engine Light illuminated

Inability to calibrate or initialize pedal during startup

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How Your ECU Detects This

Technical sensor logic and voltage thresholds

The ECU sends voltage commands to the pedal forward/rearward motor and monitors feedback from position sensors to confirm movement. If the ECU detects no position change after sending a motor command, or if motor current draw is absent or abnormal, it registers a stall fault. The ECM uses motor current and position feedback to detect mechanical binding or electrical failure.

Voltage & Parameter Thresholds

Parameter	Normal Range	Fault Condition
Motor Current Draw	50–300 mA during actuation	<10 mA or >500 mA (no movement)
Position Sensor Change	Measurable change within 500 ms of command	No change detected after motor command

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Diagnostic & DIY Fix Guide

Check these in order — from cheapest to most complex

1

Electrical connectors and wiring harness

Inspect and reseat the pedal motor connector; clean any corrosion and verify continuity on the power and ground pins.

2

Pedal motor assembly

Apply penetrating oil around the motor shaft and gently work the pedal back and forth by hand to free any seized internal components.

3

Accelerator pedal assembly

Remove and replace the entire pedal module if the motor is internally damaged or if mechanical binding cannot be resolved.

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When to See a Professional Mechanic

Not all fault codes are safe to DIY

Code B1987 is a low-severity fault. Your vehicle is generally safe to drive to a workshop for diagnosis. However, do not ignore it indefinitely — low-severity codes often indicate developing problems that become expensive if neglected. Book a diagnostic appointment within 2–4 weeks. If you notice any additional symptoms (rough running, power loss, unusual smells), treat it as higher priority.

Safety note: OBD-II codes identify the system or circuit where a fault was detected — they do not always identify the exact failed component. A professional mechanic using live sensor data will diagnose the root cause more accurately than replacing parts based on the code alone.

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How to Clear Code B1987

What happens after you fix the fault

Once the fault is repaired, B1987 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.

The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.

✅ Safe to Clear When

Fault has been diagnosed and repaired
You want to confirm the repair worked
Code appeared after a sensor was cleaned

⚠️ Do Not Clear When

Preparing for an emissions/PUC test
Root cause is still undiagnosed
Check engine light is flashing

Emissions test note: Clearing codes resets OBD readiness monitors. Most vehicles need 50–100 km of mixed driving before monitors complete. Do not clear codes immediately before an emissions or PUC inspection.