Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC Parameters
DTC will set if the throttle has not been learned after the ECM has been reprogrammed; or the learned lower rest position TP values are too far out of range from the stored learned values when:
- During a once per key-up close throttle test.
- Engine speed is less than 250 RPM.
- Vehicle speed is zero MPH.
- ECT is between 41-212°F (5-100°C).
- IAT is greater than 41°F (5°C).
- Accelerator pedal angle is less than 15 percent.
- Battery voltage is more than 10 volts.
DTC P1526 diagnostic runs during a key-up closed throttle test when the above conditions have been met.
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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