Code Definition

C1855 — Acceleration Position Sensor Conflict

System: Chassis  |  Type: Manufacturer-Specific  |  Make: Generic

About C1855

C1855 is a manufacturer-specific chassis diagnostic trouble code. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

When C1855 is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: Chassis (C) codes are stored in the ABS, traction control, or stability-control modules. An enhanced or OEM-level scan tool is usually required to read and clear them.

C1855 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The accelerator pedal position sensor assembly uses two or more independent sensors to report the driver's pedal demand to the control module, providing redundancy for safety. The module continuously compares these signals against each other and against their expected relationship. DTC C1855 sets when the module detects a conflict between the acceleration position sensor signals, meaning the readings do not agree within the allowed tolerance or do not track together as the pedal moves. When this code is set, the system may ignore the pedal input, limit acceleration, or enter a reduced power li...

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