P1639/18047 concerns the accelerator pedal’s two channels.
Meaning, symptoms, causes and checks
P1639/18047 concerns the accelerator pedal’s two channels. Their signals should change consistently, but their different scales must not be mistaken for a fault.
Affected system: Accelerator pedal
Symptoms
- Malfunction indicator illuminated or reduced power.
Possible causes
- Faulty wiring/connections; possible pedal or ECM problem.
What to check
- Compare both channel readings and verify supplies and connections against the service manual.
- Also investigate oxygen-sensor and associated wiring faults before replacing the pedal or ECM.