P0A20 fault code: Motor Torque Sensor Circuit High
Last updated · OBDCode UK editorial
Stop driving. A motor torque sensor circuit fault sits in the hybrid high-voltage family. Arrange recovery to an EV-competent workshop. Short trips are not a safe workaround.
Can I DIY?
Do not DIY this repair. We do not publish DIY repair or strip-down steps for this code on this page. Read codes and observe only; leave the repair to a qualified garage.
This fault is in the professional-only category. We do not publish strip-down or fitting steps on this page. Use a qualified garage.
Orange high-voltage cables can kill. Not a home DIY job. Workshops need competent persons (EaWR); industry benchmark is IMI EV Level 2–4. We publish no HV strip-down steps.
What does P0A20 mean?
P0A20 is a generic (SAE standard) powertrain code reported by your car’s engine control unit. It sits in the P0Axx block, which covers hybrid propulsion. The stored description is “Motor Torque Sensor Circuit High”. The code itself tells you which circuit or system tripped the fault — not always the exact part that failed.
How to diagnose P0A20 yourself
- Confirm P0A20 while parked: With the vehicle stationary in open air, scan for P0A20. Record current versus pending, freeze-frame if shown, and any other motor-torque-sensor codes on the same scan. Do not probe orange cables or sensor plugs. Stop if: You would need to open orange-cabled covers, disconnect the traction battery, or work under the car on a jack.
Park safely and switch off before locating the socket. Its position varies, so use the vehicle handbook and never force or dismantle trim. - Note hybrid warnings and Ready status: From the driver's seat, with the car in Park, note hybrid-system, master-warning, or propulsion lamps and whether Ready stays available. Do not press the starter repeatedly to 'reset' the torque reading. Stop if: Propulsion cuts out, you smell burning, or you are tempted to unplug a sensor in the high-voltage area.
- Look for damaged orange cables (no touch): From outside the vehicle, with the bonnet open if you can do so without reaching in, look only for obviously crushed, cut, or unseated orange cables. Do not touch, tape, or reroute them. Stop if: You would put a hand near orange cables, remove covers, or go under the vehicle.
Keep clear of orange high-voltage cables. Do not touch, probe or inspect them closely; stop and arrange specialist recovery.
Will P0A20 fail an MOT?
An illuminated engine management light is a Major defect at MOT (automatic fail) until the fault is repaired and the light stays off.
Before booking your test, check what usually fails on your car: see our MOT pass rates by make and model, built from 33.1 million DVSA tests.
What the MOT data says
No MOT certificate item corresponds to this code; MOT outcome data cannot be shown.
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P0A20 — quick answers
Is it safe to drive with P0A20?
Stop driving now. Stop driving. A motor torque sensor circuit fault sits in the hybrid high-voltage family. Arrange recovery to an EV-competent workshop. Short trips are not a safe workaround.
Can I fix P0A20 myself?
Do not DIY this repair. We do not publish DIY repair or strip-down steps for this code on this page. Read codes and observe only; leave the repair to a qualified garage. Specialist tools or workshop equipment — typically a professional garage job.
Will P0A20 fail my MOT?
An illuminated engine management light is a Major defect at MOT (automatic fail) until the fault is repaired and the light stays off.
Fault-code identifiers are standard diagnostic facts. Their explanations and diagnostic guidance on this site are original editorial summaries, not reproduced SAE wording. MOT defect rules reflect the DVSA MOT inspection manual (2026). This page is general guidance for UK drivers, not a substitute for a professional diagnosis.