Idle Speed High
Table of contents
P0507 HUMMER Possible Causes
- Dirty throttle body
- Electric throttle control actuator misadjusted or damaged
- Faulty Electric throttle control actuator
- Intake air leak
- Poor electrical connection to the Intake Air Control (IAC) valve
How do I fix code P0507 HUMMER?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Tech Notes
- If there are no intake leaks, clean the throttle body, adjust engine idle, and erase engine code. If the code persists you may have to replace the Electric Throttle Control Actuator (Motor).
- The Powertrain Control Module (PCM) learns the idle position of the throttle plate to ensure the correct idle. Anytime the throttle body is cleaned or replaced, the PCM must learn the new throttle position. The idle may be unstable or a DTC may set if the throttle position is not learned.
- HUMMER Throttle Body Cleaning and Idle Learning Procedure
Cost of diagnosing the P0507 HUMMER code
The cost of diagnosing the P0507 HUMMER code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Engine hard to start
- Rough or erratic idle speed
P0507 HUMMER Description
The Idle Air Control (IAC) Valve is a Powertrain Control Module (PCM) controlled stepper motor located on the Throttle Body. The stepper motor drives a valve pintle which protrudes into a passage that bypasses the throttle plates. The PCM commands the Idle Air Control Valve pintle to extend to decrease the idle speed. The bypass air flow is reduced and the idle speed decreases as the pintle approaches its seat. The PCM retracts the IAC valve pintle away from its seat to increase the idle speed. The retracting of the IAC valve pintle allows more air to bypass the throttle plates. One of the PCMs uses for the IAC system is to maintain a desired idle speed. The P0507 Diagnostic Trouble Code (DTC) is set when the Powertrain Control Module detects an engine speed outside of the Idle Air Control range of control.
