C1511: How to Diagnose & Fix — Torque Sensor 1 Malfunction (Torque Sensor Abnormal)
2 vehicles · 2 makes · $400-$5,000 repair
How to diagnose and fix C1511: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Toyota RAV4 · 2019–2020
Toyota/NHTSA Safety Recall 20V-373 (Toyota 20TA11; interim 20TB11) covers 46 certain 2019-2020 RAV4 and 2020 RAV4 Hybrid vehicles. A screw attaching the electric-power-steering gear cover may be missing or improperly tightened, allowing water to enter and eventually damage the steering gear. Power-assist loss increases steering effort, especially at low speed, and increases crash risk. Model year alone does not establish eligibility; Toyota lists 41 RAV4 and five RAV4 Hybrid vehicles produced within limited periods.
Common Symptoms
- Electric Power Steering System warning light may illuminate
- Power steering assist may be lost
- Steering effort increases most noticeably at low vehicle speeds
How to Fix
Check the complete VIN through Toyota's recall lookup or an authorized Toyota dealer. For an open 20TA11 campaign, the dealer replaces the complete steering gear assembly free of charge. This is not a seal-the-cover or retail-rack repair, and the removed 44250-series searches cannot determine the campaign part by model label alone. If steering suddenly becomes heavy or the EPS warning light illuminates, reduce speed, stop in a safe place and arrange dealer diagnosis or towing rather than continuing to rely on assist.
Owner tips & cautions
- TipBring the complete VIN to Toyota; the recall covers only a small production-defined group and cannot be confirmed from model year or trim alone.
- WarningDo not buy or install a steering rack from the removed links for an open recall. Toyota's campaign remedy is a dealer replacement performed free of charge.
Sources for this issue (2)
Mercedes-Benz GLE · 2016–2022
GLE owners (W166 and W167) report sudden loss of electric power steering assist, sometimes immediately after engine start and sometimes intermittently while driving, accompanied by the red dashboard message "Power Steering Malfunction - See Operator's Manual." Steering becomes very heavy, especially at low/parking speeds. Because EPS relies on stable voltage, CAN/FlexRay communication, and accurate sensor data, causes are almost always electrical: EPS control-module/torque-sensor faults, a corroded/loose steering-rack ground or harness connection, a blown power-steering pre-fuse, or a weak 12V battery dropping voltage to the EPS motor. NHTSA recall 16V899000 covers 2016-2017 GLE (350/400/300d/550e/43/63, etc.) where an insufficiently sealed EPS connector lets water into the control unit and deactivates assist, and TSB MC-10231025 addresses a no-assist-after-start software fault of the N68 EPS control unit on later models. This is an electronic EPS-rack fault, separate from mechanical front control-arm bushing wear.
Common Symptoms
- "Power Steering Malfunction, See Operator's Manual" red warning message
- Sudden heavy / hard-to-turn steering, worst at parking speeds
- Intermittent loss and return of power assist after restart
- Steering warning light illuminated
- Occasional correlation with low/weak 12V battery
How to Fix
Diagnose with XENTRY for C15xx EPS codes; first rule out and correct low battery voltage, a blown power-steering pre-fuse, and corroded/loose steering-rack ground and power connectors (common fixable causes). Check VIN for recall 16V899000 (connector reseal + rack inspection/replacement) and applicable EPS software TSBs. If the fault is internal, the EPS control unit / torque sensor or the complete electric steering rack is replaced (or reconditioned) and coded to the vehicle.
Sources for this issue (3)
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C1511 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does C1511 mean?
C1511 stands for "Torque Sensor 1 Malfunction (Torque Sensor Abnormal)." A Toyota/Lexus/Scion-specific chassis code in the electric power steering (EPS) system. The torque sensor in the steering column converts the rotational torque input from the steering wheel into an electrical signal that tells the power steering ECU how much steering effort the driver is applying, and therefore how much assist to provide. C1511 sets when the ECU sees an abnormal or out-of-range signal from torque sensor 1. The usual result is that the ECU disables power assist as a fail-safe, so the steering becomes very heavy — especially at parking speeds — with the EPS/power steering warning light on. The car remains steerable but takes noticeably more effort.
What are the most common causes of C1511?
The most common causes of C1511 are: Faulty torque sensor, which is built into the steering column assembly on most applications, Open, shorted, or chafed torque sensor wiring harness, Poor or corroded connection at the sensor or ECU connector, Torque sensor zero point/calibration not performed after column, ECU, or alignment work, Low system voltage or a weak battery/charging system, Failed power steering ECU. The specific cause varies by vehicle.
How much does it cost to fix C1511?
Repair costs for C1511 range from $400 to $5,000, depending on the vehicle and root cause.
Which vehicles are affected by C1511?
Au7o has documented C1511 across 2 vehicle models from 2 manufacturers: Mercedes-Benz, Toyota.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.