C1525 on Mercedes-Benz
Torque Sensor Zero Point Adjustment Undone
C1525 on Mercedes-Benz vehicles indicates torque sensor zero point adjustment undone. Au7o has documented this code across 1 Mercedes-Benz model — most commonly on GLE. 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. Typical repair costs on Mercedes-Benz range from $400 to $5,000, depending on the specific model and root cause.
Common Causes of C1525
- •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)
C1525 on Mercedes-Benz by Model
Mercedes-Benz GLE(1 issue)
- Electric Power Steering (EPS) Sudden Loss of Assist - "Power Steering Malfunction, See Operator's Manual"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.
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View C1525 across all makes →Frequently Asked Questions
What does C1525 mean on Mercedes-Benz?▼
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. On Mercedes-Benz specifically, this code is documented across 1 model.
What causes C1525 on Mercedes-Benz vehicles?▼
Common causes on Mercedes-Benz: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix C1525 on a Mercedes-Benz?▼
Repair costs on Mercedes-Benz range from $400 to $5,000, depending on the specific model and root cause.
Which Mercedes-Benz models have C1525 documented?▼
Au7o has documented C1525 on 1 Mercedes-Benz model: GLE.