00816 on Volkswagen: How to Diagnose & Fix
Power Steering Sensor (G250): Faulty
1 Volkswagen model · 2 documented issues · 2 critical · $90-$1,200 repair
On Volkswagen vehicles, 00816 (power steering sensor (g250): faulty) is most often reported on the 2010-2014 Volkswagen Polo as 00816 That Will Not Clear After an Uncoded or Mismatched Steering Pump Replacement ($150-$1,200 repair). Before touching anything else, confirm the part number of the fitted unit against the parts catalogue for that exact VIN - not against what physically fits. If the supplier variant is wrong, no amount of coding will resolve it and the unit must be exchanged for the correct one. Rated critical: Polo 00816 That Will Not Clear After an Uncoded or Mismatched Steering Pump Replacement and Polo Water Ingress at the Electro-Hydraulic Steering Pump Connectors Kills the G250 Signal. Each section below gives the symptoms, how to confirm the cause, the fix, parts and sources for that model.
Common causes of 00816 (all vehicles)
- Faulty or internally failed power steering sensor (G250) within the pump/rack assembly
- Replacement power steering pump or rack that is incompatible with the original part or from a different supplier
- Uncoded or unadapted replacement pump/control module not matched to the vehicle
- Damaged, corroded, or loose wiring and connectors at the power steering sensor
- Short to ground or short to positive in the sensor circuit
- Failing power steering control module
00816 on Volkswagen by model: symptoms, diagnosis and fix
On the 6R Polo the electro-hydraulic motor/pump unit is a coded, vehicle-matched assembly. Two different rack and pump suppliers were used across the platform, and their units are not interchangeable even though the castings, mountings and hydraulic ports look identical and the part will physically bolt straight on. Ross-Tech's own documentation carries the warning explicitly: there are at least two different manufacturers of these steering racks and they use a number of incompatible components, so if the rack or related components have been replaced, the replacement must come from the same manufacturer as the original - physical fit is not proof of compatibility. The result is a repair that appears to go perfectly and then fails on the first key-on. A used or pattern pump is fitted, the system is bled, and 00816 - Power Steering Sensor (G250): Faulty comes straight back and refuses to clear, with the steering still heavy and the warning lamp still lit. Independent workshops document exactly this on 2012-2013 cars: in one published case the pump/motor unit fitted elsewhere did not match what the vehicle was originally built with, and it had never been coded, so the vehicle could not read the sensor input correctly. Because the fault reappears immediately rather than intermittently, this presentation is easy to separate from the corrosion-driven version seen on older cars.
Common Symptoms
- Steering still heavy after a new power steering pump was fitted
- Fault code 00816 returns immediately after being cleared
- Steering warning light stays on
- No power assistance at parking speeds
- Power steering in emergency or limp mode
How to Fix
Before touching anything else, confirm the part number of the fitted unit against the parts catalogue for that exact VIN - not against what physically fits. If the supplier variant is wrong, no amount of coding will resolve it and the unit must be exchanged for the correct one. If the part number is right, the pump has very likely not been coded: connect ODIS, VCDS or an equivalent VAG-capable tool, enter the power steering control module, write the coding for the vehicle, and run the adaptation the module requires before clearing the code. After coding, check measuring value block 002 with the engine running and the wheel turned lock to lock - the G250 value should track steering effort smoothly and stay within range. Clear the fault, cycle the ignition, and road test; the code should not return. Budget for the coding step at the point of quoting: a pump fitted by a garage without VAG diagnostics will come back, and the second visit is what turns a straightforward job into an expensive one.
On the 9N and 9N3 Polo the power steering is electro-hydraulic: a combined motor/pump unit lives low down in the left front corner of the engine bay, behind the bumper and roughly level with the fog lamp aperture. The power steering sensor G250 and its harness plug into that unit through connectors that sit directly in the splash zone of the front wheel. Road salt, standing water and spray work into the connector bodies over the years, corroding the pins and chafing the loom where it is clipped to the pump housing. Once the G250 circuit goes open or picks up a short to positive, the steering control module can no longer trust the sensor signal, so it drops assistance and logs 00816 - Power Steering Sensor (G250): Faulty, very often with the sub-qualifier 'Open or Short to Plus - Intermittent'. Owners describe it as steering that is normal on a cold start and then abruptly goes heavy, or assistance that flickers in and out over bumps and in wet weather - a classic intermittent-connection signature rather than a dead component. The steering warning lamp illuminates and, because the module latches the fault, the light often stays on after assistance returns. On the Ross-Tech forums an experienced member calls this 'a very common issue with the 9N' and sends the owner straight to the pump connectors - remove the left headlight/fog lamp cover, unplug all three connectors at the pump unit, and look for water and wire damage - rather than condemning the pump.
Common Symptoms
- Steering suddenly goes heavy while driving
- Power steering assistance cuts in and out intermittently
- Steering warning light on the dash
- Assistance worse in wet weather or over bumps
- Heavy steering at parking speeds
How to Fix
Do not order a pump on the strength of the code. Remove the left fog lamp cover or the wheel arch liner to reach the motor/pump unit, unplug all three connectors, and inspect the pins and the seals for green corrosion, water sitting in the connector body, and chafed insulation where the loom is clipped to the housing. Back-probe the G250 circuit and wiggle-test the harness while watching measuring value block 002 in VCDS - a signal that drops out when you flex the loom confirms the wiring rather than the sensor. Repair is usually connector and wiring level: clean or replace the terminals, repair any broken conductor with a soldered and heat-shrunk splice rather than a crimp, re-seal the connector with dielectric grease, and re-route or re-clip the loom so it is not resting on the pump body. Clear the fault and road test; the module needs a completed drive cycle before the warning lamp extinguishes. If the signal is genuinely absent with a good harness, the sensor is integral to the motor/pump assembly on most variants, which means a reconditioned or new pump unit and, on later units, coding the replacement to the vehicle. Ross-Tech's own documentation warns that at least two manufacturers supply these racks and pumps with incompatible components, so fitting a unit from a different supplier without checking the parts catalogue is the single most common way this repair goes wrong.
Looking for 00816 on a different make?
View 00816 across all makes →Frequently asked questions
What does 00816 mean on a Volkswagen?
00816 stands for "Power Steering Sensor (G250): Faulty." This is a VAG (Volkswagen/Audi/Skoda/SEAT) manufacturer-specific fault code stored by the power steering control module, indicating a fault with the Power Steering Sensor (G250). The module has detected an electrical problem with the sensor signal (short to ground, open/short to positive, or a faulty/implausible sensor), which can cause stiff/heavy steering, power steering operating in emergency (limp) mode, and an illuminated warning light. It very commonly appears after a power steering pump or rack replacement when an incompatible or uncoded part is fitted, because steering racks/pumps from different suppliers use non-interchangeable internal components. On Volkswagen it is documented across 1 model: Polo.
How do I diagnose 00816 on a Volkswagen Polo?
Before touching anything else, confirm the part number of the fitted unit against the parts catalogue for that exact VIN - not against what physically fits. If the supplier variant is wrong, no amount of coding will resolve it and the unit must be exchanged for the correct one. If the part number is right, the pump has very likely not been coded: connect ODIS, VCDS or an equivalent VAG-capable tool, enter the power steering control module, write the coding for the vehicle, and run the adaptation the module requires before clearing the code. Published repair guidance and available estimates are in the Polo section on this page.
What causes 00816 on Volkswagen vehicles?
Documented causes on Volkswagen: 00816 That Will Not Clear After an Uncoded or Mismatched Steering Pump Replacement; Water Ingress at the Electro-Hydraulic Steering Pump Connectors Kills the G250 Signal. Generic causes of 00816: Faulty or internally failed power steering sensor (G250) within the pump/rack assembly, Replacement power steering pump or rack that is incompatible with the original part or from a different supplier, Uncoded or unadapted replacement pump/control module not matched to the vehicle, Damaged, corroded, or loose wiring and connectors at the power steering sensor.
How much does it cost to fix 00816 on a Volkswagen?
Published repair estimates on Volkswagen range from $90 to $1,200 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.