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.
Diagnostic Trouble Code (DTC) Information ECM-925C
Condition
The diagnostic trouble code (DTC) is stored if the engine control module (ECM) registers that the movements of the throttle is impeded, or that the return spring in the throttle unit is not functioning correctly, when attempting to adapt the electronic throttle unit.
Substitute Value
Depending on the fault, the engine control module (ECM) can cut off the supply to the damper motor in the electronic throttle unit. The throttle will then attempt to set itself to the return position.
Possible Source
- The throttle is sticking or is blocked (e. g. oil film, dust)
- Contact resistance or oxidation in the terminals between the engine control module (ECM) and the electronic throttle unit
- Open-circuit, short-circuit to ground or short-circuit to supply voltage in the wiring for the damper motor in the throttle unit
- Short-circuit to each other in the wiring for the damper motor in the throttle unit
- Damaged throttle unit.
Fault symptom[s]
- Malfunction indicator lamp (MIL) lit
- Poor performance.
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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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