C1525 on 2016-2022 Mercedes-Benz GLE (GLE 300d, GLE 350, GLE 400, GLE 450, GLE 350 4MATIC, GLE 450 4MATIC) — Torque Sensor Zero Point Adjustment Undone
1 vehicles · 1 makes · $400-$5,000 repair
How to diagnose and fix C1525: most-reported vehicles
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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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C1525 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 C1525 mean?
C1525 stands for "Torque Sensor Zero Point Adjustment Undone." A Toyota/Lexus chassis code in the electric power steering (EPS) system, published in Toyota repair manuals under the heading "Torque Sensor Zero Point Adjustment Undone (C1515, C1525)". Within that pair, C1525 specifically indicates that the rotation angle sensor value initialization has not been performed, while C1515 covers the torque sensor zero point calibration. Toyota is explicit that these DTCs do not by themselves mean a part has failed — the power steering ECU stores them when the required scan-tool calibration is still outstanding, typically after ECU, column, torque sensor, or battery-related service. Symptoms are usually a power steering warning light and heavy or uneven assist.
What are the most common causes of C1525?
The most common causes of C1525 are: Rotation angle sensor value initialization / torque sensor zero point calibration not performed after EPS service, Power steering ECU, steering column, or torque sensor replaced without performing the calibration, Battery disconnected or replaced, clearing the stored calibration, Loose or corroded torque sensor connector at the steering column, Failed steering torque / rotation angle sensor, Failed power steering ECU (Toyota says replace only if the code still sets after performing the calibration 3 times). The specific cause varies by vehicle.
How much does it cost to fix C1525?
Repair costs for C1525 range from $400 to $5,000, depending on the vehicle and root cause.
Which vehicles are affected by C1525?
Au7o has documented C1525 across 1 vehicle models from 1 manufacturers: Mercedes-Benz.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.