Code Definition

B1990 — Pedal Forward / Rearward Potentiometer Feedback Circuit Failure

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

About B1990

B1990 is a manufacturer-specific body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1990 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

B1990 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 Body Control Module or Pedal Control Module monitors the position of the adjustable pedal assembly using a feedback potentiometer mounted at the pedal slide mechanism. DTC B1990 sets when the module detects an invalid signal voltage on the potentiometer feedback circuit, including readings outside the expected reference range, a stuck signal that does not change while the pedals are moving, or an open or short on the signal wire. The potentiometer is a three wire sensor receiving a reference voltage of typically 5V from the module, a ground return, and a signal that sweeps through the refe...

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