Code
P1510
HUMMER
P — Powertrain
Throttle Control System Performance - Throttle Limitation Active
AI status
Completed
Completed
100%
Causes
- Throttle body or throttle actuator (motor) malfunction
- Faulty accelerator pedal position (APP) sensor or sensor correlation fault
- Wiring harness damage, open/short, or poor connector contact in throttle/APP circuits
- Low or unstable vehicle battery/charging system voltage
- PCM/software fault or internal module failure
- Mechanical obstruction or binding of the throttle plate
Symptoms
- Reduced engine power or 'limp' mode with limited throttle response
- Check Engine Light or MIL illuminated
- Delayed or no throttle response from accelerator pedal
- Vehicle may start and idle but will not accelerate normally
- Stored or pending throttle/APP related trouble codes
What to check
- Read and record all stored/active/pending DTCs and freeze frame data using a capable scan tool
- Check battery voltage and charging system under load (expect ~12.6 V at rest, >13.5 V when charging)
- Inspect throttle body, connectors, and wiring for damage, corrosion, or looseness
- Compare accelerator pedal position sensors and throttle position feedback with live data
- Attempt bidirectional control of the throttle body (command throttle plate movement) if scan tool allows
- Check for mechanical interference or carbon build-up restricting throttle plate movement
Signal parameters
- Accelerator Pedal Position (APP) sensor 1 and 2 raw voltage (typical approx 0.5–4.5 V range)
- Commanded Throttle Angle / Percent
- Actual Throttle Position (TP) / Measured Throttle Plate Angle
- Throttle Motor Current or Motor Duty Cycle (if available)
- System/Bus Voltage (battery voltage) while commanding throttle
- Status bits: limp mode / throttle limit active flag from PCM
Diagnostic algorithm
- Retrieve all codes and freeze frame data. Note if P1510 is active or pending and capture related codes (P2101, P2120, P2138, etc.).
- Check battery voltage and charging system. Recharge or replace battery if voltage is low or unstable. Repair charging issues before further testing.
- Visually inspect throttle body, connector, and wiring for damage, corrosion, or loose pins. Wiggle test harness while monitoring live data for intermittent changes.
- With scan tool, monitor APP1 and APP2 voltages while slowly pressing the accelerator pedal. Verify both sensors track smoothly and are within expected ranges and correlation limits.
- Monitor commanded throttle vs actual throttle position. If the commanded change is not followed, attempt a scan-tool commanded throttle plate move (bidirectional test). Note motor response and current draw.
- If commanded control fails or motor draws excessive current, remove and inspect throttle body for mechanical binding, carbon build-up, or foreign objects. Clean if required and re-test.
- If wiring/power to the throttle actuator is suspect, perform backprobe voltage and resistance checks from the PCM to the throttle body and APP sensors. Repair any open/short or high resistance circuits.
- Clear codes and road-test to attempt to reproduce. If P1510 returns, record freeze frame and live data for the event.
- If wiring, sensors, and throttle body check good but fault persists, consider PCM software updates or reflash per manufacturer TSBs. Replace PCM only after confirming other components are good and per manufacturer procedures.
- After any repair, erase codes and verify proper operation with a full test drive and scan tool verification that the throttle limitation is cleared.
Likely causes
- Throttle actuator cannot reach commanded angle (stuck, high current, or failed motor)
- APP sensor outputs do not match each other or do not follow expected input vs commanded throttle
- Intermittent wiring/connector problem between throttle body and PCM
- Battery voltage drop during throttle actuator operation causing protective limiting
- PCM detected inconsistent feedback and applied throttle limitation as a protective response
Fault status
Status
Throttle Limitation Active — PCM has limited engine throttle due to a detected throttle control system fault. Reduced power (limp) mode is active until underlying fault is repaired.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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