A car that responds poorly to the accelerator can be unsettling, particularly when the symptom comes and goes. P2122 gives the technician a circuit to investigate, but it does not by itself distinguish a pedal assembly problem from a wiring issue.
Keep the full scanner description
For the VAG application, Ross-Tech lists P2122 / 008482 as an accelerator-position sensor G79 signal that is too low. It identifies the pedal assembly and its harness as possible areas of concern, and notes that the signal-voltage arrangement can involve other engine components. Read the P2122 reference.
Use the vehicle’s own wiring information to establish the circuit arrangement. Do not transfer pin numbers or expected readings from a superficially similar car.
Details worth recording
- Whether the problem occurs immediately after starting or during a journey.
- Whether accelerator response is limited continuously or cuts in and out.
- Any recent work near the pedal, footwell, wiring or engine connectors.
- Other codes stored at the same time, including supply-voltage entries.
For garages, attach the measured values with the ignition state and test location. If more than one pedal channel is displayed, identify each channel exactly as the diagnostic tool labels it. A screenshot without labels or conditions is difficult to interpret later.
Choose the assessment around the evidence
An intermittent pedal or harness concern often needs the complete vehicle. A postal ECU enquiry becomes more useful when the surrounding circuit findings are available. If accelerator behaviour makes the car unsafe to control, stop using it and arrange assistance.
Contact AXION with the report to agree the next step. We welcome UK-wide enquiries and confirm vehicle and module support before booking.
Reviewed September 2026. Use the complete manufacturer-specific fault description and vehicle repair information.