Code Definition

B1628 — PRNDL Reverse Input Open Circuit

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

About B1628

B1628 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 B1628 is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit.

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.

B1628 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 B1628 diagnostic trouble code is set when the Body Control Module or Powertrain Control Module detects an open circuit on the reverse input line of the PRNDL (Park, Reverse, Neutral, Drive, Low) selector switch. The PRNDL switch uses discrete signal lines to report gear lever position to the control modules, and an open on the reverse input means the module no longer sees a valid voltage transition when the lever is shifted to R. Typical electrical conditions that set this code include a broken wire in the harness, an unplugged or backed out terminal, a fully open contact inside the PRNDL ...

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